SoftwireEngineer;240722 Wrote: > (BTW, your setup is exactly my goal. Tell us more about your all digital > path system/sound, as a good digression).
Digression would be right! Rather than starting a new thread, I'll go into a little detail on the theory and implementation here and then point you to all the other forums, etc. where you can study up. Important concepts (in order of importance). 1) Frequency, time, and phase correction for both the room and loudspeakers. 2) Putting frequency corrected bass drivers in the corners and crossing over at relatively high frequencies (325Hz in my case). 3) Using digital crossovers and filters. Implementation: 1) Acourate is the only program I know of that will generate phase-corrected filters for convolution engines. No choice here. 2) You also need a convolution engine that implements phase correction to make effective use of the filters. Inguz DSP is by far the easiest, but only corrects 2 channels. BruteFIR (Linux) supports a much wider array of configurations. There are other convolution engines available, such as the Foobar plugin and the TacT RCS (which doesn't correct for phase). 3) In my system I have some room correction in the bass amp (TacT S2150 using TACS-generated filters). The Digital Crossover is implemented in the bass and main amps. The TacT RCS is in bypass mode and used as a preamp for volume control. Overall frequency and phase correction is done by InguzDSP. Ideally, every driver is driven by its own amp using digital correction and crossover. That was overkill for me, so I just picked a good quality phase-linear main speaker. Comments: a) The GW Labs upsampler is to circumvent a deficiency in the asyncronous sample rate converter in the TacT RCS when it converts from 44.1 to 96kHz. I could achieve the same thing by offline upsampling in software to 96kHz and buying a transporter. b) The Big Ben makes the quality of the source irrelevant. I couldn't tell the difference between a stand-alone Transporter and the SB3 running through the Big Ben. For more reading: Acourate: http://www.acourate.com http://tech.groups.yahoo.com/group/acourate/ Inguz DSP: http://www.inguzaudio.com/RoomCorrection/ TacT stuff, in general: http://tech.groups.yahoo.com/group/TacTAudioUsersGroup/ Room correction theory and much more: http://www.regonaudio.com http://groups.yahoo.com/group/regsaudioforum/ A bunch of guys much more obsessive than myself about similar systems: http://tech.groups.yahoo.com/group/The-Crooked-Path Watch out, it's a slippery slope... Kim -- krochat ------ Acourate -> Inguz DSP -> SB3 -> GW Labs DSP (96kHz upsampler) -> Apogee Big Ben -> TacT RCS 2.2X -> 2x TacT S2150 -> Vandersteen 3a Signature + TacT W210 ------------------------------------------------------------------------ krochat's Profile: http://forums.slimdevices.com/member.php?userid=6579 View this thread: http://forums.slimdevices.com/showthread.php?t=28490 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
