oh snap a phone app. PSA entering the modern age!!! Great to hear
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@tony22 Stereo pink noise (from the Nordost System Tuning CD) at the listening position using Octave RTA on an iPad. I don’t have a calibrated microphone that works with this new iPad, but close enough for me…
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Sounds great. Q4?
Very nice! Without DSP that’s pretty darn good.
@tony22 I set up the four subs by ear, but that was interesting to see–kinda like using RTI to check my work…
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You’ve got a good ear 
, although personally I try to shoot for something that follows a bit more of the Harmon profile.
I could probably do something like the Harmon profile without DSP because I have both adjustable subs as well as Fyne SuperTrax supertweeters, but I am lucky enough to be able to play my music at pretty high levels even in the evenings as a result of having good windows and even better neighbors!
Well, keep in mind that with a 4096 point FFT, you only have ~10 Hz resolution and so 10 data points from 10 and 100 Hz.
Each octave is a doubling of frequency and so you only have 4 data points between 40-80 Hz then you are smoothing 1/3 octave on top of that.
In short, you aren’t going to see any of the more narrow band peaks and dips and this potentially makes things look far smoother than it actually is.
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You are of course correct. I just did it quicly to answer the question. I’ll change settings and re-run. Or maybe I’ll just let sleeping dogs lie!
FWIW, a faster and finer take. Still showing the peak around 100 Hz, and a roll off at both ends of the spectrum.
Sounds good to me!
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Well, I wouldn’t necessarily trust the mic above 10 kHz. It should be pretty accurate in the subwoofer range though.
You might also turn off the sub and measure that was for comparison’s sake to look at that peak around 100 Hz. Is that peak affected by the measurement height (standing up versus sitting down)? Sometime a mode around that range is based on ceiling height.
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For sure. I see that in both my rooms with a 7’3” and 7’6” .. modes right around that value that moving things around really did not help or effect.
I heard on Paul’s video that the subwoofer will have a wireless option.
What’s the expected latency for this and will this latency be audible in a high end audio system, especially when mating with the woofer of a speaker. Would this not be problematic at the crossover point? Also doesn’t this unnecessarily introduce an ADC and DAC into the chain, even if it is at sub 80hz frequencies?
Welcome to the community! What kind of system do you have?
Less the 2ms and it’s perfect for synching. Runs at 96kHz so 80Hz is indistinguishable from analog feed.
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Latency of around 2ms is very low for wireless, and that is a great spec.
The SVS sub wireless system has around 25ms latency as an example, so it should be compensated for, if used.
Will the subs also accept balanced XLR L and R analog inputs from a pre-amp? Zero delay with direct wiring can be beneficial, if the other main speaker drivers are also synced together in time/distance/phase.
What are the outer dimensions of the sub? It looks like maybe 16x16 x16 inch?
I am really looking forward to owning a pair these!
Welcome to what I can only assume is another Accuphase fan!
I for one would love to hear a bit about your system
Best,
JP
Not to highjack the thread but I run vintage audio yet find Paul’s videos very insightful. My currently equipment:
Transport: Denon DCD-2500NE, Denon DCD-3500G, Yamaha CDX-1050, Denon DP-59L, Accuphase T-106 DAC: Kryna Tube DAC, Esoteric D-07, Stax Talent BD-A, DDC: Musical Fidelity V-Link 192, Sonicwield Diverter HR, Accuphase DG-28 (DSP Room Correction)
Preamp: Accuphase C-270, Accuphase C-270V, Kenwood L-07cii, Technics SE-A8, Sony TA-E88, Accuphase C-17 (Phono) Amplifier: Accuphase P-600, Kenwood L-07Mii, 2x Kenwood L-08M (1x L-08PS), 2.5x Kenwood L-06M, Kenwood L-05M, Sansui B-2301, Technics SE-A7, 2x Sony TA-N86, Yamaha A-2000, Stax 006Ts, Stax SRD-7mk2, Intercity HD-1L Winter Edition, Marantz EE-1 Transducers: System Audio Pandion 2, Paradigm Founder 40B, Diatone DS-3000, Canton 12.4 Sub, Hifiman Arya, Focal Celeste, Stax SR-407, Stax SR-Sigma Pro, Stax SR-Lambda Signature, Marantz SE-1S Cables: Accuphase, Chord, Oyaide, Lenehan, Audioquest, Transparent, Inakustic, Aurealis, Kryna, Locus Power: Accuphase PS-1200 Power Regenerator, IFI, PS Audio Dectet
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You had me at, “Accuphase”.
Welcome to the mad hou…um, er forum.
Cheers.
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Yes, we’re using wisa HT with a much lower latency and higher quality than most wireless sub kits.
Yes, the subs can accept XLR L/R balanced inputs (along with RCA and speaker level inputs). We also included a 4 pin XLR input that we’re using as a speaker level input + 12V trigger for new PMG amplifiers, to give a simple connection.
You are very close on the sub dimensions but it is a bit narrower at 14.75” wide. Depth, including the grille and rear panel amplifier heatsink is 17.5” and the height is 17.75” including the 1” tall feet. They are very soft rubber and are height adjustable.
I’m doing a 4 part youtube series on the subs. It has both general information on subs and some product specific things of why we focused on certain features and performance.
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