A friend of mine is having some problems with his stereo setup. I have tried setting things up correctly, but I fail.Here is the setup:
S = Speakers ( Klipsch RF7's )
CV = Cerwin Vega (HFA 21"SX)
AE1 & 2 = P1152 (AV15H) from AE Speakers (The subs are facing each other)
Couches = Listening positionsThe length on the "left side" is not 6meters btw, but 8m. Did a typo!As for amplifiers etc, he has:
Vincent SP993 = 2x200W (For Klipsch)
Behringer EP2500 = 2x600W (For the AE Subs)
Behringer DCX2496 for EQ
All the subs are connected to the DCX2496, and the DCX2496 is connected to the Carver Preamp via Subwoofer Preout.
So as you can see, his setup should be capable of some serious bass.
And that is the problem... I am having difficulties setting things up correctly..
I can say some of the things I have tried:
First of all, I mute ALL the subwoofers, and play just with the speakers. We try some different songs (with bass that varies a bit), I then measured approx how much SPL there was. The Klipsch speakers had no problems putting out around 106dB, at the LP.
Then I unmute the Cervin Vega sub. Same songs, same listening level. No difference in SPL. I try adjusting the phase from 0, 45, 90, 135, 180 degrees. No difference. I try setting the polarity to "Inverted" (And also adjusting the phase again). There is a TINY difference FELT when setting the polarity to inverted, but not much. The SPL is the same (around 106dB). No matter if the CV is CRANKED, there is no difference in the SPL. It's like the bass just.. goes somewhere else.
Note: When im up front with the CV, the bass is INTENSE. And there is a ****load of air coming out of it.. so it's pumping hard!
So, not much difference with the CV enabled. It's a huge 100 kilo subwoofer with a 21" woofer.. it should be able to put out some serious bass. But.. it's not.Okey. The next thing I try is the following:
I unmute the CV.. Now I want to try and work some with the AE subwoofers. As you can see, these subwoofers are facing each other. The polarity is set to "Inverted" on both of them. We do the same thing, play some songs, measure (and feel). I then disable ONE of them (the one to the left on the picture), and there is NO difference FELT, and NO difference measured. I enable it again, then try to the set polarity to "Normal" on the DCX2496. Still no difference at all. I play around a bit with the Phase, setting it to 90, 180 degrees... no difference.
I would assume if hooked up correctly, the measured SPL should be approximately +3dB. But there really isn't any difference at all, when playing with 1 or 2 of these subwoofers. When stacked, there should be around +6dB increase, I think ?
Note: I have of course checked the drivers, they ARE PLAYING.To sum it up:
1. Speakers only: A lot of nice bass!
2. With the CV enabled: A tiny bit more bass felt, but not measured (Phase & polarity has been played with)
3. I disable the CV, and try to work with the AE subs - there is NO difference FELT or MEASURED, when im using just one of them, or both (Phase & Polarity has been played with).
What is going on here ?
Any suggestions ?