BFD | Electronic Equalization Devices

**tdamocles** · **11-29-06, 07:54 PM**

I co-located a BIC h100sub and a new eD sub and found that the frequency response mirrored each other exactly. Is this possible because of room acoustics?

**tdamocles** · **11-29-06, 07:56 PM**

Wow...I should proof read my stuff....

**Sonnie** · **11-29-06, 11:25 PM**

I would say it is very possible and probable. I symmetrically located my two SVS subs in the front corners of my room and got exact response out of both of those.

**tdamocles** · **11-30-06, 04:27 PM**

On both graphs the the FR takes a dive at 20hz identically... Is there some sort of subsonic filter on the BFD? Could this be room acoustics screwing with the response?

**brucek** · **11-30-06, 04:38 PM**

Quote:

On both graphs the the FR takes a dive at 20hz identically

What is the low end response of your two subs?

Quote:

Is there some sort of subsonic filter on the BFD?

No

brucek

**tdamocles** · **11-30-06, 05:50 PM**

Quote:

brucek wrote:

What is the low end response of your two subs?

No

brucek

The subs are stacked. The h100 is on top of the eD. The H100 is front firing/rear port and the eD is bottom firing/rear port. They were both plumbed through the BFD in the bypass mode when these tests were taken. The first is the h100 and the second is the eD. Any comments?

**tdamocles** · **11-30-06, 06:00 PM**

Not quite identical but close....

The H100 stated specs are 24hz(+-3db)- ?

The eD stated specs are 18hz(+-3db)- ?

**brucek** · **11-30-06, 06:25 PM**

Did you do your response checks with each sub independently. (one off and the other on)?

Is the stack in a corner?

The response of the H100 seems normal, but the other should be a bit better in the bottom end I would think.

brucek

**tdamocles** · **11-30-06, 06:29 PM**

Quote:

brucek wrote:

Did you do your response checks with each sub independently. (one off and the other on)?

Is the stack in a corner?

The response of the H100 seems normal, but the other should be a bit better in the bottom end I would think.

brucek

Both are stacked in a corner and were tested independently. Seems odd that the FR follows a crossover of 80hz when I have all crossovers disabled.

**brucek** · **11-30-06, 06:52 PM**

Quote:

when I have all crossovers disabled.

Why is that? Normally you measure with the crossover enabled...

Can you expand on your reason or expectation for using two subs - one of which has a lesser response than the other?

brucek

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