agenda n history of revel n our mission n our product philosophy – research – design –...
TRANSCRIPT
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Agenda History of Revel Our mission Our product philosophy
– Research– Design– Listening– Production
Products Multichannel audio Multichannel-specific products Future products
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History of Revel
Dr. Harman wanted a loudspeaker company as unsurpassed as Madrigal– No such loudspeaker company existed - it had to be created
January 1996 announcement– Company goals and direction
Unsurpassed performance and industrial design
Unparalleled resources – People, expertise, facilities, financing
Unheard of in high end audio Around 400 U.S. speaker companies, Revel given unique opportunity to
do it right
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Revel Mission - Produce the World’s Finest Loudspeakers
What constitutes “the world’s finest loudspeakers”?• Acoustical performance-first and
foremost• Unsurpassed quality• All visual aspects
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Revel Mission-Produce the World’s Finest Loudspeakers
How?• First rigorously designed high end loudspeakers• Combining high-end sensibility with state of the
art research and development• Double-blind listening tests demonstrate listener
preference• Renowned industrial design team producing
loudspeakers that look as great as they sound.
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Revel’s Product PhilosophyOverview
Research Design Listening confirmation Production
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Revel’s Product PhilosophyResearch
Research should be the first step
– Avoid trap of false assumptions
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Revel’s Product PhilosophyResearch
Resources to do genuine research Industry-leading researchers
– Dr. Floyd TooleLong working relationship at Canadian National Research Council
– Sean Olive– Many others
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Revel’s Product PhilosophyResearch
World’s leading research to determine:– How we hear (starting at the beginning)– Important factors in perceived sound quality – Room acoustics– Loudspeaker/room interaction– Making listening tests valid scientific data
Only then do we know what we are trying to achieve!
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Revel’s Product Philosophy - Research
Tradeoffs involved in all speaker design– Optimum performance can only be
achieved by selecting the right priorities
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Revel’s Product Philosophy - Research
What is the relative importance of various sonic characteristics?– Timbre– Directivity– Resonances– Distortion– Dynamics– Phase– Waveform preservation
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Revel’s Product Philosophy - Research
Our listening tests and breakthrough measurement process are used to determine how significant sonic characteristics are affected by:– Transducer diaphragm, surround, motor, voice coil
and former materials and construction– Enclosure shape, construction, materials, and
damping– Filter network (crossover) component types and
characteristics
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Revel’s Product Philosophy - Research
How can these questions be answered?– 1000’s of double-blind listening tests
Our ears are the ultimate authority
– Dozens of areas objectively investigated
– Result is phenomenally powerful
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Revel’s Product Philosophy - Research
We have determined what is sonically important:– Timbre-overwhelmingly dominant
Directivity – off-axis responses, critical to timbre
– Resonances – must be kept below audible threshold
– Dynamic compression-usually overlooked, but very significant
– Distortion - frequency-dependent thresholds
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Revel’s Product Philosophy - Research
...And what is not important, or less important…– Waveform preservation – not audible– Phase-audible in specific ways
Individual transducers must have good phase performance to enable proper crossover operation
Phase shift per se, is not audible in loudspeaker systems
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Revel Product Philosophy - Design
Now That We Truly Know What the Goal Is…
Designing products to address the results of our research:How do we characterize and measure:– Timbre?– Resonances?– Distortion?– Dynamic compression?
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Revel Product Philosophy - DesignMeasuring Timbre
Timbre is the most significant audible characteristic - requires the greatest emphasis
Simple “on-axis” measurements of little to no value– Gave speaker measurements a (deservedly)
bad name
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Revel Product Philosophy - DesignMeasuring Timbre
Massive research effort comprised of in-room measurements and double-blind listening tests– Assures research and measurements
have a basis in the “real world”
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Revel Product Philosophy - DesignMeasuring Timbre
Breakthrough measurement process has been developed that has a high correlation to sound quality
Requires a combination of many measurements– Must be made in a very large anechoic chamber to retain important
resolution
Sophisticated post-processing of all data based on the extensive in-room measurements and listening tests
Only U.S. High end loudspeaker company with such facilities
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Direct Sound Measurements
• An improved method with an average of 7 measurements
• Mimics brain’s processing
• Commonly seen as “on-axis” response
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Equally Important Early Reflections
Reflections with short delays are just as important as the direct sound.
Appropriate weighting for each boundary based on extensive research.
Most loudspeakers perform poorly in this test.
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Reverberant Sound Contributes to Perception of Timbre
The loudspeakers’ output in all directions contributes.
Includes sound heard after multiple reflections from all
boundaries.
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Single Calculated Curve Correlates Closely to Sound Quality
Weighted average of all measurements based on measurements in many listening rooms.
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Revel Product Philosophy - Design
Having created measurements that have been proven to be sonically relevant, what tools are required to provide optimum performance according to these new tests?
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Revel Product Philosophy - Design
Three State of the Art Anechoic Chambers– Provide high resolution results– Do not suffer from disadvantages of simulated
chambers
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Revel Product Philosophy - Design
180 Hz 4 pi anechoic chamber– 5,000 cubic feet
(142 cubic meters)– Full transparent
floor
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Revel Product Philosophy - Design
60 Hz 4 pi anechoic chamber– 10,000 cubic feet (283
cubic meters)– 1200 four foot (1.2
meter) wedges– Calibrated to +/- 0.5db
below 60 Hz
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Revel Product Philosophy - Design
2 pi anechoic chamber– 7,000
cubic feet (198 cubic meters) with 800 three foot wedges
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Revel Product Philosophy - Design
Complete in-house transducer design and production– Optimum transducers for each specific application– State of the art transducers not available from any
vendor Midranges are limitations in many speakers
– Inadequate spectral range– Inadequate power handling/high compression
OEM woofers have power handling and compression limitations
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Revel Product Philosophy - Design Unequalled design resources
– FEA (finite element analysis) design of motor systems, surrounds, and spiders
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Revel Product Philosophy - Design -Unequalled Design Resources
Laser scanner for domes, surrounds, and enclosures
Enabled fully pistonic midranges
Optimized surround behavior for greatly reduced distortion and smoother midrange response
Optimized enclosure shapes, materials, and construction
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Revel Product Philosophy - Design
Laser interferometry– Diaphragm
development
Revel Midrange Competitor’s Midrange
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Revel Product Philosophy - Design
Unequalled transducer design resources– Rapid prototyping
with stereo lithography
– Fast samples of any 3-dimensional parts, such as baskets
– Enhanced ability to try multiple iterations Dr. Green from ER dropped by to help us
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Revel Product Philosophy - Design
Dynamic (Power) Compression
Does more than rob the music of life Changes timbre as the music plays
– Frequency-dependent and non-linear Revel has reduced dynamic compression to levels
previously associated only with horn-loaded systems
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Revel Product Philosophy - Design Dynamic (Power) Compression
We have developed quantitative tests– Has given us
valuable data regarding what is effective to reduce compression
– Tests are performed throughout both the transducer and system development processes
Sub-15 with LE-1– compression results
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Revel Product Philosophy - Design Dynamic (Power) CompressionMinimized in All Revel Loudspeakers
Huge voice coils for given application– Salon, voice, embrace 1 1/2” (38 mm) voice coils
in 4” (102 mm) midrange– Gem 2” (51 mm) voice coil in 5 1/4” (133 mm)
woofer– Sub-15 uses 4” (102 mm) single layer flat wire
voice coil
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Revel Product Philosophy - Design Dynamic (Power) CompressionMinimized in All Revel Loudspeakers
High-order filters (crossovers) drastically reduce compression compared to 1st-order systems
Tight gaps to optimize heat transfer designed with F.E.A. (Finite element analysis)
Large motor systems for heat dissipation
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Revel Product Philosophy - Listening Tests
Rigorous listening tests are true measurements, not just opinions.– The ability to perform truly objective listening tests is a
huge advantage. Double-blind listening tests prove revel’s
superiority. Six varied listening rooms.
– Five fixed rooms at 2100 ft3 (59 m3), 3000 ft3 (85 m3), 4500 ft3 (127 m3) , and 5400 ft3 (153 m3).
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Speaker Mover Listening Lab
Automated speaker mover to eliminate speaker -position variable or to efficiently test its effects (e.g. off-axis performance, digital room EQ )
Physically and acoustically optimized and equipped for scientific testing of two-channel and multichannel configurations
Acoustically transparent screen hides identities of loudspeakers
Experimental design, control, collection and analysis of data automated under computer control
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Speaker Mover in the Listening Lab
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Detail of Speaker Mover
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Double-blind Listening Room (MLL) From Front
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Automated Speaker Mover: Why?
Loudspeaker Position has significant influence on perceived sound quality. The effect can be as great as the differences among loudspeakers (Olive et al., JAES vol. 42, 1994)
Therefore, in listening tests, variable of position MUST be eliminated or controlled
For in situ tests, position effects can only be controlled and balanced by testing each loudspeaker in each possible position
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…. x 4 speakers = 24 possible speaker-
position permutationsper program
…. x 4 speakers = 24 possible speaker-
position permutationsper program
Trial #
1
2
3
4
5
6
Position: 1 2 3 4
Example: With 4 programs there would be 96 trials (with no repeats)
Before Speaker Mover…. Example: A/B/C/D Loudspeaker Comparisons
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…. x 4 speakers = 24
1 possible speaker-position permutation
per program.
Trial #
1
2
3
4
5
6
Position:
1 2 3 4
Example: With 4 programs there would be 96 4 trials (with no repeats)
After Speaker Mover….Example: A/B/C/D Loudspeaker Comparisons
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Speaker Mover Analysis Station
•Multi-dimensional analysis provides important data for ongoing research
•Guards against erroneous conclusions
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8
7
6
BLIND SIGHTED
1G1DST
PREFERENCE
RATING
Blind Vs. Sighted Tests
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Visual cues have statistically significant influences
In “sighted” tests opinions can be influenced more by product identity than by the sound of the product.
In “sighted” tests listeners were less responsive to differences attributable to position or to program.
In other words - Believing is Hearing
Blind Vs. Sighted - Summary
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Comparative Listening Tests
Group Mean Speaker Preference
3
3.5
4
4.5
5
5.5
6
6.5
7
7.5
8
Speaker
Pre
fere
nce
Group Mean
Double-blind listening tests prove superiority Revel sonic superiority proven before product release
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Renowned Multichannel Listening Facilities
Used by F.C.C. for U.S. high definition (DTV) television audio standard listening tests
5,400 ft3 (153 m3)
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Revel Product Philosophy -Production
Vertical integration enhances quality– Design transducers in-house
Build most transducers in-house
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Revel Product Philosophy - Production
Vertical integration enhances quality State of the art in-house enclosure finishing facilities
Several coats of sealer, with sanding in-between
Polyurethane finish applied to primed surface
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Revel Product Philosophy - Production
Vertical integration enhances quality State of the art in-house enclosure finishing facilities
Temperature controlled oven assures durable finish
Clear coat sealer for deep shine
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Revel Product Philosophy - Production
Vertical integration enhances quality State of the art in-house enclosure finishing facilities
First clear coat polishing with coarse polishing compound
Final clear coat polishing with fine polishing compound
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Revel Product Philosophy - Production
World’s greatest prototype is irrelevant if production units are not the same!
Best OEM vendors have +/- 3dB variations in response
0.5dB variations, over a wide range, are very critical Matching pairs is insufficient--Only guarantees two
equally flawed speakers
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Revel Product Philosophy - Production Unsurpassed Quality Measures
Individual crossover tuning for virtually perfect replicas of original reference
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Unique Products
Proven to be state of the art in listening tests in 2-channel stereo applications
All Revel loudspeakers were conceived and built with multichannel audio in mind
No compromises are made in 2-channel performance to optimize multichannel performance
The Salon, Studio, Gem, and Sub15/LE-1 are equally at home in 2-channel or multichannel systems
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The Salon Loudspeaker
The world’s most accurate loudspeaker– A whole new level of
freedom from loudspeaker coloration
– Unparalleled off-axis accuracy
Everything we know about loudspeakers utilized– From its inception and
throughout the design process
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The Salon Loudspeaker
State of the art transducers reduce distortion below audibility
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The Salon Loudspeaker
New, advanced aluminum alloy dome tweeter Pistonic to over 30 kHz The state of the art in high frequency performance
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The Salon Loudspeaker
4” (102 mm) titanium midrange Pure titanium alloy concave dome Large 1.5 inch (38 mm) voice coil Optimized high-flux neodymium
motor Co-injected fluoro-elastomer rubber
surround
Magnetic shielding
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The Salon Loudspeaker
Three high output, low compression 8” (203 mm) woofers– Very high output capability with true full range extension– 1.5 inch (38 mm) 6 layer voice coil with 26 mm winding
length– Very high flux, optimized motor system– Copper sleeve on pole piece to minimize inductance and
eddy current modulation distortion– Concave poly cone with nitrile rubber surround for
optimum balance of stiffness and mass– Magnetic shielding to allow placement near video
monitors
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The Salon Loudspeaker
6 1/2” (165 mm) mid-woofer allows smaller midrange, higher crossover for lowest coloration
Optimized for low compression, with 1.5 inch (38 mm) voice coil
High flux, low distortion motor system F.E.A. optimized to minimize non-linear distortion– Copper sleeve on pole piece to minimize inductance and
eddy current modulation distortion– Concave poly cone with nitrile rubber surround for
optimum balance of stiffness and mass– Magnetic shielding to allow placement near video
monitors
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The Salon Loudspeaker
Calibrated, precision high frequency trimming
Allows for high frequency room characteristic compensation
0.5 dB increments precisely tailor response, assure left/right response matches at any adjustment
Highest quality switches for extremely long life without audible colorations
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The Salon Loudspeaker
Low frequency adjustments– Help optimize performance in a wider range of rooms and room
placements
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The Salon Loudspeaker
Filters (crossover): 4-way, 24 dB/octave (4th-order) acoustic response at 125 Hz, 450 and 2.2 kHz
Sensitivity: 86 dB SPL, with 2.83 volts RMS @ 1 meter, 4 pi (anechoic)
Impedance: 6 ohms nominal, 3 ohms minimum
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The Salon Loudspeaker-Frequency Responses
In-room response: ± 1 dB from 25 Hz to 12 kHz In-room response relative to target response: ± 0.75
dB from 25 Hz to 20 kHz First-reflections response: ± 1 dB from 25 Hz to 17
kHz Listening window response: ± 1.5 dB from 25 Hz to
18 kHz Low frequency extension: -10 dB @ 17 Hz. -6 dB @
20 Hz. (-3 dB @ 24 Hz)
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The Studio Loudspeaker
Created to deliver much of the Salon’s performance in a smaller package
Utilizes the same state of the art tweeter as the Salon, along with the same ultra-low diffraction baffle
5 ¼” inverted titanium dome pistonic midrange from the Gem – Allows a lower (220 Hz) crossover point, eliminating the
need for the Salons’ 6 ½” mid-woofer
– Allows the two 8” woofers to be farther from the floor, reducing the chance of lower midrange coloration
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The Studio Loudspeaker
Two (rather than three) Salon 8” woofers provide excellent low frequency output capability
Low frequency extension:– -10 dB @ 22 Hz (instead of 17 Hz in the Salon)
– -6 dB @ 26 Hz (instead of 20 Hz in the Salon)
– -3 dB @ 33 Hz (instead of 24 Hz in the Salon)
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The Gem Loudspeaker
Cost-no-object compact system– Flexible
applications Groundbreaking
industrial design
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The Gem Loudspeaker Advantage to place for
optimum performance, ignoring low-bass when used with Sub-15
Designed from the ground up as a system
State of-the-art transducers
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The Gem Tweeter Construction Details
Very linear response, with low compression and distortion
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Gem Woofer Construction Details
•Titanium dome allows true pistonic operation throughout its operating range
•Motor derived from JBL Pro LSR32
• Optimized for lower distortion and compression
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Gem Final Assembly
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The Sub-15 Subwoofer and the LE-1 System
Redefines low frequency reproduction - Actual timbre can be perceived
Absolutely state of-the-art performance
Purist approach (and brute force)
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The Sub-15 Subwoofer and the LE-1 System
Previous state of the subwoofer art:– Sliding EQ and compression severely limit
performanceLimited amplifier output capability (no FTC
requirements)Limited voice coil thermal capacityLimited cone assembly mechanical durability
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The Sub-15 Subwoofer and the LE-1 System
Overcomes performance limitations of competitors– No need to disguise lack of power handling, lack or amplifier
power, or lack of mechanical capability– Means no sliding EQ or limiting that dynamically alters response– Massive 0.36 lb. (163 gram) edge-wound flat wire voice coil
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The LE-1 Low Frequency Electronics System
Provides equalization for Sub-15
Massive output capability of over 700 watts into one Sub-15, or over 1,000 watts into two Sub-15s.
Crossover ideally blends Revel speakers with Sub-15
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The Sub-15 Woofer Construction Details
•Motor derived from JBL Pro 2242 woofer
• Reduced distortion, increased excursion, and reduced suspension non-linearities
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Interim Summary
Revel has unparalleled resources Industry-leading research Acoustical goals clearly identified Completely optimized designs
– Utilizing all knowledge from research Objective listening tests prove superiority Production processes guarantee consistency
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Multichannel Audio
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Multichannel Audio - Why?
Opportunity of significantly improved sonic reality
Two channels cannot capture or reproduce an acoustic event
Attempts to create “ambience” in the listening room are inherently flawed
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Multichannel Audio - Why?
Original performance venue ambiance can be captured and reproduced
No compromises need to be made in 2-channel performance– Wide dynamic range requirements should be
addressed for 2-channel, as well as multichannel and home theater
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Multichannel Audio - How?
DVD Audio (not AC-3) provides the bandwidth to provide 5.1 or more channels at better than CD quality
Acceptance of 5.1 configuration for home theater provides breakthrough opportunity for multichannel audio
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Multichannel Audio - The Risks
System configuration is far more complex than 2-channel stereo
Significant learning curve exists for proper product selection and application (installation)
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Multichannel Audio - The Risks
– Risk exists to actually degrade overall sonic accuracyIf the added channels (center and surround) have higher coloration in their intended locations than the front left and right speakers, the overall system coloration can increase, compared to a 2-channel system
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Multichannel Audio - The Central Challenges
Match timbre properly in all channels in the listening room– All loudspeakers must be as accurate at the
main left and right speakers Reproduce intended soundfield accurately
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Multichannel Audio - Revel Excels
The first purist audiophile multichannel loudspeakers
Everything discussed so far was applied to Revel multichannel models
All Revel “Front” speakers, and Sub-15/LE-1 designed equally for 2-channel and multichannel without compromise for either
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Multichannel Audio - Revel Excels
Multichannel-specific models (centers and surrounds) meet the challenges of:– Timbre matching in the listening room– Accurate soundfield reproduction– Extraordinarily low coloration
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Multichannel Audio - Timbre Matching
Timbre of front left and right channels, in their placement positions, must match timbre of center and surrounds in their radically different placement locations
To sound the same to the listener, speakers must be specially designed for their application– Identical speakers should not be used all around
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Multichannel Audio - Center Channel Speakers
Center channels are almost always closer to a boundary than the left and right speakers– Closer to the floor– Closer to the ceiling– Close, or on top of, a rear projection monitor– Dramatic coloration is introduced, unless the
loudspeaker is designed specifically for the environment
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Typical Frequency Response of High Quality Loudspeakers Utilized in Left and Right Front
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Typical Frequency Response of Conventional High Quality Loudspeaker Utilized in a Center Channel Position
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The Voice Center Channel Loudspeaker
The solution to center channel challenges
Proper timbre matching in real-world applications
3-way design provides uniform response over very wide listening area
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The Voice Center Channel Loudspeaker
Made to work in real environments– Switch- selectable
placement compensation
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The Voice Center Channel Loudspeaker
Front projection application
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The Voice Center Channel Loudspeaker
Rear projection or direct-view application
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The Voice Center Channel Loudspeaker
Custom built-in application
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The Voice Center Channel
Two 8-inch (210 mm) mica and carbon-filled co-polymer dome woofers with 2-inch (52 mm) voice coils featuring copper shorting rings to dramatically reduce distortion
Four-inch (102 mm) titanium dome midrange with 1.5-inch (38 mm) voice coil and true pistonic operation throughout its operating range
1.1-inch (28 mm) textile dome tweeter with extremely low distortion and compression
4th-order crossovers at 300 Hz and 2.2 kHz Optimized response for use with 80 Hz electronic crossover
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Multichannel Audio - Surround Loudspeakers
Surround speakers are in very different locations than front speakers– Surrounds must be specifically designed for
this reality– Front Left/Right speakers used as surrounds
provide poor timbre matching and unacceptable spatial characteristics
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Multichannel Audio - Typical Front Left/Right Response
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Multichannel Audio - Front Speakers Utilized as Surrounds
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Multichannel Audio - Proper Surround Placement
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The Embrace Surround Loudspeaker - Timbre and Spatial Reproduction
Multi-channel timbre matching in practical, wall- or ceiling-mounted locations
Unparalleled spatial reproduction– Freedom from excessive
localization– Superb performance over
wide listening area
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The Embrace Surround Loudspeaker - Radiation Pattern
Acoustic recordings (classical and jazz) need dipoles
All films mixed utilizing non-localizable surrounds
Embrace scales original sound field to smaller spaces
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The Embrace Surround Loudspeaker
8-inch (210 mm) mica and carbon-filled co-polymer dome bass transducer with 2-inch (52 mm) voice coil and copper shorting ring for low distortion
Two 4-inch (102 mm) titanium dome midranges with neodymium motor systems and 1.5-inch (38 mm) voice coils for extraordinary power handling
Two 1-inch (26 mm) coated textile domes optimized for low distortion and high power handling
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The Embrace Surround Loudspeaker
Bipole option to ease customer concerns
Remote-controlled dipole/bipole switching.
Dual-Drive for non-obsolescence.
First-reflections response: ± 1 dB from 25 Hz to 17 kHz.
Listening window response: ± 1.5 dB from 25 Hz to 18 kHz.
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Revel Product Line - The Future
Ultima Series– Ultima Studio
3-way floorstanding system
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Ultima Studio 3-way floorstanding system
Ultima series styling Salon metal dome tweeter 5 1/4” (133 mm) pure titanium dome midrange similar
to Gem woofer Two 8” (203 mm) high output woofers similar to
Salon woofers 1114 mm high x 324 mm wide x 492 mm deep
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Revel Product Line - The Future
Affordable, high performance line– Performa F30– 3-way floorstanding
system for less than $3,900 U.S. retail
– All metal transducers
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Revel Product Line - The Future
Affordable, high performance line– Compact monitor
system M20 for under $2,000 U.S. retail
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Revel Product Line - The Future
Affordable, high performance line– 3-way center channel C30 for under $1,800
U.S. retail– Dipole surrounds S30 for under $2,500 per
pair U.S. retail– 15” powered subwoofer system B15 for
under $2,800 U.S. retail
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Summary
Revel has Achieved our Goals:– Superior acoustical performance– Cutting-edge Industrial Design– Unparalleled overall quality
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SummaryRevel has Unparalleled:
– Research– Design sophistication– Technical resources– Listening tests as tools– Production consistency
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SummaryRevel products proven sonically
superiorUnique multichannel market
position:– The only true high end multichannel
loudspeakers
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Summary Revel’s products are ideal for market needs:
– Superior two channel sound Floorstanding Compact Subwoofer system Complementary multichannel products avoid
obsolescence Center channels Surrounds
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