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it is MMM measurement averaged over 1 square meter approximatively.

Yes, it is 5 loudspeakers (10 channels) in 5 closed volumes DIY box for differents uses. If we define the speakers as A,B,C,D and E from left to right, C is used as center mid/tweeter and B and D as center bass for multichannel. We are planning future uses such as stereo dipole with B and D, or...

Following Griesinger's recommandations, we tried to place subwoofers (grouped front+left, back+right) so to excite different low frequency modes but keeping L+R summation relatively flat, see picture (L is blue, R is red, L+R is black)

In Igor's system, the subwoofers receive signals lower than about 75Hz

The loudspeakers below the TV screen has 5 coaxials bass/mid + tweeters same as the one in the Kef Q900

I've installed many Xilica Solaro in stereo or 5.1 (Solaro QR1) up to 32 channels immersiv setups (Solaro FR1) : the DSP is quite as versatile and configurable as QSC Core110f. Only its FIR capability is a bit less : 4096 taps per channel for Solaro against 8192 taps for Core110. But QR1 is less...

I never had opportunity to compare side by side BlueHorn and Designer, so I cannot comment. But the Designer model with a competent EQ (IIR or FIR) is a superb solution, and much cheaper.... I also heard TAD in pro studios but I was more impressed by Designer's balanced timbre and dynamics...

In Aliqaz's room, a pair of Meyer Acheron Designer with one or two Meyer subwoofers would be a very nice system, linear and (very) powerfull. No JBL (ie M2) can give you same levels without distortion (Meyer mid/hi is a 4 inches driver !)

Most explanations above seem to be a bit wrong. To be in conformity with SMPTE RP standards, the level at listening position for a front channel should be 85dBC when playing SMPTE-2095 pink noise with RMS value at -22dBFSD (Full Scale Digital). This SMPTE-2095 pink noise has a crest factor of...

POS did a simple toggle switch connected to QSC GPI input to change presets or other parameters manually. The QSC box is very different : it is an ABX switchbox with remote and display with statistics of right/wrong responses. Not a lot were built by QSC but by chance, I have one ;) I have used...

More or less..... why ?

In Igor'system, here is the topic, we use 4 SVS PC2000 subwoofers more or less in middle of walls. We did many comparisons with various positions, DBA, global or unitary EQ, etc... With the QSC processor and the GUI screen, it is very easy to switch each on/of subwoofer, compare EQs or...

In our case, from analog input to analog output and without FIR, the delay is near 3.17ms. With our 8192 taps FIR and uncentered FIR impulse, the total delay is 45ms.

I had a look to your interesting methods. I'm using a signal similar to your single sines : it is 5 single sine burst with the middle of each sine separated to the next by a known number of samples. This gives following graphs. More explanations can be found in...

Synchonisation clock : we use the QSys internal clock. It is the same for all DSP channels and I see not reason why there would be any drift between channels. The time alignement has been measured at listener place and aligned for all channels and speakers at 0.1ms (maybe 0.2ms for subwoofers...

The diagram looks a bit complicated because it has been designed to listen and compare many possibilities : - without/with FIR/IIR EQ for front/subs/surrounds - compare various EQ - switch between music and movie (X-curve) together with LFE level at +10dB - compare 1/2/3/4 subs - compare real...

And here the main GUI screen :

The Qsys is limited to 8192 taps and you can only do 2x8192taps. I think that more taps is not allways wise : it may give you a better precision in lower frequencies but the calculated correction will then be wrong when temperature/humidity/opened doors, etc... change. There are many ways in the...

The QSC Core110f was chosen because of three main features : number of outputs, totally configurable schematics and possibility to import custom FIR filters (ie 2x8192 taps). There are not so many processors that can be used : - Yamaha DME24/64 have no FIR filters and user interface is a bit...

I took part to most technical choices in Igor's system. On the amplifier side, the Rotel and Hypex were allready used. I choose the Crown because of its 1U compacity for 8 channels and no cooling fans, so no noise. Its sound was no real criteria because for me, all correct amplifiers sound the...