EP4000 - Awesome output if only one side is used.

[lastditch]

EP4000 - Awesome output if only one side is used.
Looking for some help on this one.

Gear:

Infinite SLA Baffle
2xIB315 @4ohm wired in parallel to channel one @ 2ohm load
2xIB385 @8ohm wired in parallel to channel two @ 4ohm load

EP4000
Dip switch settings:
Left
Right
Right
Right
Right
Left
Left
Right
Right
Left

Pioneer vsx919
Sub pre out rca cable to 1/4 mono plug adapter

I have verified I get enough volts from the pre sub out to the amp to drive it.

The problem I am having is that if I use both outputs on the ep4000, the bass response is much lower than if only one channel is used. I dont have a good spl meter to measure this but let me assure you that with only the dayton or FIs plugged in, on ready player one car scene, my chest is punched hard throughout. If I plug both sets of subs in, I dont get that, the output is much lower.

I have taken the FI subs, and used just channel 1 and 2, both channels will power the subs no problem. So it doesnt seem to be an issue with one of the channels. Ive used just the daytons on ethier channel and they sound much louder than when both sets of subs are used as well. So I dont believe is a cabling issue, or channel issue.

Is it possible while using both sets of subs one is out of phase with the other?

Edit: I believe I checked the polarity of both sets of subs and they are wired correctly but Im going to double check again.

Edit2: Just checked both pairs, they are wired black to black and red to red on both ends. Not sure what to do or test now.

Thoughts?

[ThomasW]

Hi,

Are the DIP switch markings identical to the silk screened markings on the chassis? On some amps they're reversed.

I don't see how this IB is going to work from the standpoint of matching driver output. The Fi drivers should play much louder than the 385's. If you lower the output to match the 385's to the Fi's, the Fi's will be just loafing along not doing any work. If you up the power to the 385's to match the Fi's, the 385's should basically blow up.

How big is the room?

[lastditch]

Well I was planning on using channel two for the Dayton and just keep the gain down so I dont blow em. Basement is pretty big, viewing area is in an alcove and then it opens up to a open basement.

2 subs each under the screen.