Description

The general thoughts that went into the overall plan in designing this room was to accommodate not only audio but video.  The acoustic plan was to eliminate as many parallel surfaces as possible.  The side walls are skewed out by 2” from front to back to help reduce slap echos.  Both the front and the back of the room incorporate a curve design that would help scatter sound.  I replicated the ceiling design from a concert hall in Osaka, Japan.  The ceiling to floor dimension at the front of the room, 11.5 feet, expanded in five different planes to 17.5 feet at the rear of the room. 

The walls of the room were built with 12” cinderblock.  Durawall wire reinforcement was incorporated in between each vertical course.  A 1” rebar was inserted into every other vertical cavity and then the cavities were filled solid with 3500 PSI pea gravel concrete.  The walls were framed with 2 x 6  studs on 12” centers.  Purlins were inserted and spaced 48” apart in each vertical cavity. 

A dedicated 200 Amp service supplied all the power requirement for lighting, HVAC, wall outlets, and dedicated 220 volt outlets for all of the equipment.  Fiberglass insulation was then installed in the walls before ¾” plywood sheeting was glued and screwed over all of the studs.  Two layers of 5/8” fire code sheetrock were then glued, with Durabond 90, and screwed to the ¾” plywood. 

The ceiling was built using trusses on 16” centers spanning from the front to the rear of the room.  The trusses were designed with a space varying from 10” to 24” in between the top and bottom cords.  This space was designed to accommodate additional insulation, lighting, and HVAC.  The ceiling was finished using ¾” tongue and groove western ridge cedar.  This was glued and stapled to the trusses.  The floor was poured using 3500 PSI concrete to a thickness of 8”. 

Acoustic testing was then done by a Richmond company, “Acoustics First”.    ETF measurements were taken and sound panels were then designed according to a patented algorithm.  The panels were then built by Owens Corning according to prescribed specification. 

The finished trim in the room was done in 18th century motif that incorporated a combination of hardwood raised panels and appropriately painted trim.  Hardwood tongue and groove flooring was applied over a ¾” plywood substrate glued and fastened to the concrete floor. 

The main electronics in this system mostly come from Krell.  I have always been a fan of their electronic design and robust construction.  Their reputation for quality electronics made my choices easy.  The choice of additional electronics pretty much fell in line and the choices can be viewed in my list. 

From the time the room was finished until present, I have had four different loudspeaker systems starting with a pair of Electro Voice Patricians I built 50 years ago.  Being a DIY guy, I always built loudspeaker systems that were tailored to my personal sonic choices rather than having to settle for speaker systems designed by others for mass appeal. 

Being an audiophile, I am always searching for better sound and the equipment it takes to experience better sonic satisfaction.  The only limitation is my lovely wife Sue.


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Room Details

Dimensions: 55’ × 30’  X large
Ceiling: 18’


Components Toggle details

    • Air Tight PC 1 Supreme
     low output moving coil cartridge
    • Kuzma 4 point 14
     14 inch tone arm
    • My Sonic Labs Eminent Gold
     low output moving coll cartridge
    • SME SME 312
     12 inch tone arm
    • PBN Audio PBN- DN308
      Direct drive turntable with numerical tach display
    • Ampex ATR 102 - Aria
     Ampex ATR 102  reel to reel tape machine, record and play. 1/4 inch 2 track and 1/2 inch 2 track.
    • Krell KBX electronic crossovers, five
     Electronic crossovers for three front and four surround channels and sub control via the 707 at 60 hz.
    • Krell Krell EVO 707 processor, one Krell EVO 202 preamp, two
     front end controllers
    • Krell FPB 600, three- FPB 300, four, EVO 403, one
     Class A power amps
    • Minus K 200 BM 4
     200 LB capacity vibration abatement platform
    • Aesthetix Rhea
     Three channel input  phono pre
    • Turntable Frankentable
      This is a diy, home brew table.  Platter is a Sota vacuum table fitted with an 80 lb. lead platter. Three VPI  HRX motor drives on a custom built FRP epoxy plinth with 220 lbs of epoxy lead internal ballast. total weight 530 lbs.
    • Minus K 750 BM
     custom built 750 lb. capacity vibration platform
    • Kuzma Air Line- two
     An air bearing straight line tonearm.
    • Kuzma Four point - 9
     nine inch tone arm
    • Lyra Atlas
    low out put moving coil cartridge
    • Koetsu Platinum Signature Jade
    Low output moving coil cartridge
    • Dynavector XV 1 S
    Low output moving coil cartridge
    • Aesthetix Rhea
     Three channel phono pre
    • Crane Song Trakker
     Peak limiter mastering amplifier
    • Crane Song STC 8
     two channel peak limiting  mastering amplifier
    • OPPO UDP 205
     Blu Ray DVD, CD player
    • Bricasti M - 1
     two channel DAC
    • Crest Audio Pro 9200- four amplifiers
     solid state, class H, 6500 watt stereo amplifiers, four units to drive sub woofers
    • APC SMX 1000, four units
      1000 watt smart UPS battery backups for all front end equipment
    • Synology DS 1817
     20 terabyte hard drive storage for CD material
    • Tivo Roamio- Pro
     TV recording and storage device
    • Sony PLV 1100ES
     3d - 4K video projector
    • Stewart Film Screen Electrascreen 135
     135 inch, perforated projection  screen
    • DIY line source loudspeaker, three for front
      9.5 ft tall, three way speaker. Twenty four-7 inch Scan Speak Revelator mid bass drivers, four BG RD 50 planar mids, four BG RD 50 planar mids, forty Panasonic EAS 10TH 400A leaf tweeters
    • DIY 7.5 ft line source surround towers, four
     Six Scan Speak 8 inch Revelator  bass drivers, six Scan Speak 3 1/2inch Revelator  mid drivers, six Scan Speak Revelator silk dome tweeters.
    • Krell 15 inch metal cone woofers,
     Woofers sourced from Krell as used in their Master Reference Subwoofer. Eight drivers per side, each in their separate sealed enclosures with cone xmax of 2 inches.
    • PS Audio P-10 Studio - two units
    110 Volt AC power regenerator.
    • PS Audio P-5
    110 Volt power regenerator.
    • PS Audio P-3
    110 Volt power regenerator.

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222222&text=sa
New York Aciustics?  That really brings back memories.  I bought a lot of drivers from Jim Cox and he was gracious enough to spend many hours on the phone with me as we discussed different options.  Among other things I bought Strathearn ribbons from him and several models of Panasonic leaf tweeters.  And my mother still uses the 8.2 speaker kit that Jim sold me.  I never met the guy but I certainly enjoyed our conversations.

Thank you for describing the evolution of your speaker design.  Very interesting indeed.

As things worked out, my experiments with line arrays took a different turn.  I ended up with horns for midrange and highs and high-efficiency vintage paper cone woofers.  My current setup has the 15” woofers in an open baffle and that has given me the best bass quality that I have had in years. 

salectric

222222&text=sa
Wow, and Double Wow!  That is quite an impressive room and system and obviously the product of much work on your part.  Can you share a few more details about the speaker design including your choice of drivers, crossover design etc.?

salectric