what am i doing wrong ? 2.2 setup

[sebpoterie]

Hi,

By advance, sorry for my english.

Mains : Anthony Gallo Nucleus Ref 3.1

Three way floor standing
Tweeter CDT Tweeter with 300° dispersion; 3kHz - 35kHz
Mid range driver
Dual 4" carbon fiber midrange drivers
Bass range driver 10" carbon fiber bass driver
Crossover Frequency None on tweeter or mid-range units. Low pass filter on woofer set at 125hz.
Frequency Response 34Hz to 35kHz +/- 3dB;
Sensitivity 88dB/W/M


Front left sub : SVS SB4000

13.5” Driver
19-310Hz ± 3 dB

Lateral right sub : SVS SB3000

13” Driver
18-270Hz ± 3 dB



DSP : MiniDsp SHD

Amp : Vincent SP31MK

Subs are both at the same distance from the listening position
No back wall (open space)
Crossover 80 Hz (LR 24db/oct)

First I gain matched my two subs (UMIX in front of each subwoofer driver, 4 inches, one after each other, and I play a sine wave at 50hz).
=> Same gain output on both sub.

then

I use soundoctor's tutorial

Here's the magic trick if you have one sub in the front and one in the "back"

Turn off the back sub.

Align the front sub

- using the out-of-phase nulling setup on my TEST CD page

- I personally used REW's alignement tool and delayed the mains by 7.75 ms but I do not know if I understand well this tool...

Now turn the MAINS off.

Flip the FRONT SUB's POLARITY SWITCH to the opposite position from wherever it is.

Turn the BACK SUB on. Play a sine wave at the crossover freq. (X80 for me)

Null the back sub to the front sub AT THE LISTENING POSITION by adjusting the back sub's phase knob and level control.

When finished, put the FRONT SUB's POLARITY SWITCH back to where it WAS.

Now the subs are both level matched AND TIMED correctly AT THE LISTENING POSITION. If you accomplish this correctly if you are playing a drum solo (as an example) you should perceive the lower drum freqs (like from the kick drum and floor toms) to be coming from in the front of the room, as you would expect.

I do not know if it is the right way to balance the subs ?

I use this house curve (Harman6 slightly modified from 1.09 kHz to 13.4 kHz)

Dirac ON

Advice very welcome ;-)

 

[Sonnie]

You have a lot going on in the room.. didn't think I'd ever spot your main speakers. Reminded me of a game we use to play with finding things in pictures... lol.

You can level match the subs and mains with the SPL meter in REW.

There are some threads here on time aligning the subs using REW that may help.

 

[sebpoterie]

loudspeakers are here...

Left one with sub1

Right one...

The first wide angle picture is a wide angle picture...taken from a high angle view...The next time, I will tidy up the room a little...wolves are there to catch bad vibes ;-)

What about the soundoctor's methodology for sub2 alignement ?
What about the final spectrogram result ?

Thanks.