Audio Investigations: Open Links

Friday, March 4, 2011

Open Links

Thread I started at Gearslutz about converting absorption factor to Sabins

Nobody has answered my question directly, though it appears the correct thing is only to include front face (not even side faces) based on standard measurement procedure. It's intended to be equivalent to an "open window".

I'm now trending away from acoustics for the moment, to focus on this weekends plan to modify Acoustats by replacing old electrolytic capacitor with Solen film. Though perhaps I shoulda got bigger capacitor to replace whole bank of capacitors instead (I debated with myself about that ad infinitum 2 years ago).

Apparently the existing bank is 57.01 uF, consisting of one 47uF cap (the old terrible electrolytic), a 10uF film, and a 0.01 uF film (the latter two were used in original MK-121-A design in combination with a 220uF electrolytic, then the last Medallion "C" modification, which I have, changed the electrolytic to 47uF.)

Here is an Audio Asylum thread on Acoustat interface mod (starting with non-Medallion.

There's also a discussion about "tired film", something that has been worrying me.

http://www.audioasylum.com/forums/MUG/messages/15/152322.html

Here's a fairly new thread (started Feb 2010) on DIYAudio with Andy Szabo from the Hafler period of Acoustat production. The AcoustatAnswerMan !!!

http://www.diyaudio.com/forums/planars-exotics/183168-acoustat-answer-man-here.html

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Living Room System

2-way with Acoustat 2+2 from 125Hz to 17k, and a pair of SVS Ultra PB 13 below 125Hz (linear phase LR8 crossover). Now using the best from 2 pairs of 2+2's, one white and one black, EQ'd to be the same. Acoustats powered by Aragon 8008 BB. All amps including Subs and Tweeters driven by Emotiva Stealth DC-1 DACs. DACs for each way driven by AES from Behringer 2496 DEQs (EQ and limiting), driven by AES from MiniDSP OpenDRC (linear phase FIR crossovers or corrections generated by RePhase). Driven by AES from a Henry Engineering AES 4-way splitter. Driven by AES from a Tact RCS 2.0 Digital Preamp with Room Correction and PEQ bypassed. The Tact receives most sources as digital. Analog sources are converted to digital at 24/96 by Lavry AD10 analog to digital converter on the side wall and sent via a 12 foot AES cable to the Tact. Emotiva XSP-1 serves as phono preamp and analog selector and level adjuster feeding the Lavry. Oppo UDP 205 plays most discs, and does streaming from my library and Qobuz using Roon, through digital coax output to the Tact, but in other cases through HDMI and a Kanex Pro De-Embedder, and in the rare remaining cases (used to be more) where neither digital transfer method retains full resolution, analog through balanced cables to the Emotiva and Lavry. Denon DVD-9000 plays HDCDs better than anything I know of and connects to Emotiva and thence Lavry for conversion to 24/96. A Sonos Connect is an alternate Tact source, and destination for the Pioneer F-26 FM tuner, which also plays in other rooms through Sonos. A Dynavector 17DIII is mounted to the hockey-tape dampened Ittok tonearm on a Linn Sondek LP12 with Lingo external power supply, using a Michell plastic low spindle clamp is with a trimmed felt washer. There are seperate AC circuits for Subwoofers, Acoustat Poweramps, and Rest of System. The Rest of System circuit is conditioned and regulated by a Panamax MB 1500 and served via a variety of audiophile grade power strips. Single ended digital cabling by Blue Jeans Cable using Belden coax, and Blue Jeans LC-1 audio cabling. AES by Canare, Mogami, Gotham City, and Geistnote/Canare. PTFE balanced audio cable by Surf Cables. Speaker wire mostly hand twisted milspec PTFE coated 12g silver plated copper. Playlists generated by mplay version 0.69 soon to be released.