BFD | Electronic Equalization Devices

**IBorBox** · **01-20-08, 07:10 PM**

Yes, it increased. My sub level was previously at -18 and only goes to -20 in the receiver. What I think happened was since my channels on the amp are not equal, 2 of the drivers where getting less power and were not significantly contributing to the SPL. When I bridged, they all are seeing the same output. Also there might be a small delta in gain by reconfiguring the amp (2 channel --> bridged).

**IBorBox** · **01-21-08, 07:55 AM**

Maybe I could get a couple of these 6db inline attenuators http://www.partsexpress.com/pe/showdetl.cfm?Partnumber=266-234 to bring the levels down to within the range of my receiver so the behriger is again an option. Thoughts?

**brucek** · **01-21-08, 09:03 AM**

Yeah, that would work. With the small attenuation provided, it likely has poor output impedance, so place it at the sub amp and not at the receiver....

brucek

**IBorBox** · **01-21-08, 03:58 PM**

Thanks Bruce, is the version 1.4 firmware a good way to go with the 1124P? I'm not sure what the midi feature does so I wanted to find out if it was needed/nice to have/or what. I realize this may too specific of a question. Thanks

**brucek** · **01-21-08, 05:45 PM**

Quote:

is the version 1.4 firmware a good way to go with the 1124P?

The V1.4 firmware fixed a bug in the midi. REW can communicate with the BFD by passing the filters instead of entering the filters by hand. I've only ever entered by hand, since I think I can enter them faster than you can connect the midi cable. Some people seem to enjoy the midi connection method though..

New BFD's would come with the V1.4, but old stock in a music shop may not. It's easy enough to test at the store before leaving...

brucek

**IBorBox** · **01-21-08, 07:27 PM**

Thanks again! Seems as though the midi function is nice to have but not essential.

**IBorBox** · **01-25-08, 10:28 PM**

Just got my 1124 set up. The REW software is awesome, Nice job! My 1124 had a date code of 0706 which I assume is June of 07 (?). Is this version 1.4? I can see why entering using REW/MIDI would be nice. I used my Radio Shack meter tied into my sound card in a Dell semi-performance oriented desktop. Wasn't as straight forward initially as I thought it would be but made more sense once I got thru it. I used 12 filters to get within +/-2 dB. I still need to lower my input into my amp to the lowest setting in my receiver (-20). I was barely getting two LEDS flashing on the display for input level. My output of the sub was +6/7 dB of mains when testing with the built in test tones.

**Wayne A. Pflughaupt** · **01-28-08, 01:30 PM**

Highly doubtful that twelve filters are actually needed. You might want to take a look at this article.

Regards,
Wayne

**IBorBox** · **01-28-08, 07:49 PM**

Interesting article Wayne, thanks. I will look at it again. It was challenging getting 12 filters to work.

**IBorBox** · **01-28-08, 08:03 PM**

I'm still experiencing to high of a line level into my amp with the sub out level of my receiver set at the minimum level. I tried the 6-dB attenuators mentioned above but I got a significant hum (I put them on the amp input). So I'm looking for a variable volume control that will allow me to get a higher input into my BFD but allow me to control the BFD output into the amp without experiencing the same hum. I was looking at the Reckhorn B-1 or F-1 as the least expensive solutions for volume control. Any other options or these reasonable devices to accomplish volume control without the hum of the passive line attenuators I tried? Thanks all for your help.

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