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DSP1124 altered my phase

1772 Views 9 Replies 6 Participants Last post by  PoorSignal
Hi guys, I did back to back test with a coupler to bypass the unit physically
I had a reasonbly good response with no null without the dsp1124 in the loop. (Sub + L R)
Same test, once I added the DSP there is a null around 85hz and it is sharp. (No filters)

I know this is a timing issue, and I adjusted the subwoofer distance by 1 feet further to compensate, but this didn't help, I even tried adding 2 ft, 2.5 ft, or no addition. The void is still there more or less. Moving the phase knob just moved the null spot

However, after I EQ'd my sub on its own, the graph with sub + L R does not have any nulls anymore. I probably took away my 55hz peak that caused the null together with the L, R. But as I said above, without the BFD I don't have that NULL.

So as long as the EQ'd result was OK, do you think everything is good? It just means I just can't run the unit in bypass mode unless I wanted to listen to a void.
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OK I have done some more tests..
without the DSP1124, the null happens at phase 0
with the DSP1124, the null is at phase 180 (bypass mode), so it is indeed flipped around 180.

It would seem I should leave it at phase 0 then. However after equalizing I get no null only if I leave the knob at 180, so there it is. Once I leave 180 the null gets bigger and deeper.

So that is the final setting.
How did you initially setup your phase?
A bit confused by your above comment that you did more tests and you found the phase was switched only on bypass mode or it was switch on bypass and eq mode?
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