Looking for an EQ unit to go between pre + power for sub - diyAudio
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Old 20th January 2010, 08:59 PM   #1
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Default Looking for an EQ unit to go between pre + power for sub

Hi all,

I was wondering if anyone could give me any recomendations for an EQ unit suitable for use with a subwoofer?

I am looking at one or two 15" subs maybe up to two dual 15"'ers running from a Behringer EP4000 in an AV set up, bass signal will be from teh AV sub out but due to playing with various cabs and drivers I would like to be able to tune and control these in some way.

An adjustable rumble filter is probably what I am really looking for, maybe some sort of upper cut off too?

Anything that can be used or bought here in the UK would be fine, even if I can only cut the bass out below 20Hz that would suit the JBL drivers I currently use.

Many thanks,
Steve
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Old 20th January 2010, 10:52 PM   #2
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The AV sub out should be appropriately XO'ed with the L/C/R speakers within the AV receiver/processor/amp and should only require level adjustment.

Or do you want to EQ the subwoofer, cabinet & room?
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Old 20th January 2010, 11:20 PM   #3
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Something like this?

Creative Sound - Product Details
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Old 20th January 2010, 11:32 PM   #4
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The AntiMode Bob has is very intriging.

He also has Reckhorn B1 and B2 if you budget isn't quite that large.

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Old 21st January 2010, 01:38 AM   #5
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I would have recommended the B-1 as a price alternative but I don't see it listed on his product index page.

EDIT: I see it now.
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Old 21st January 2010, 08:33 PM   #6
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My 2-cents.

The better the woof, the more you want a really effective 24dB/octave LF filter and starting to roll off higher than you might imagine - say starting at 25 Hz - nothing but garbage and subway trains passing underneath the studio below that.

What's really swell is two things: (1) a repeated recording of a sweep tone, say from 300 to 20 with chirp markers at 50 Hz points on the way down and (2) a parametric equalizer with say two or three elements in the woofer range.

While sine waves cause standing waves in your room, sweeping reduces that some and besides, a lot of LF content is kind of steady and sine-like.
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Old 22nd January 2010, 08:30 AM   #7
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Check out Marchand Electronics - very well made products that I have used in the past.

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Old 22nd January 2010, 10:15 PM   #8
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Hmm, seems like my post never posted. The electrons must have gotten tired and not made it, I'll have to feed them better :-D

If you want to cut out sub-bass garbage, you need a highpass filter, not an EQ. The EQ will only cut at the EQ frequency-below that, all the crud gets through. The more dB per octave, the more crud it will cut, but the more it can affect the sound.

If you want to be able to adjust the sound while you play with different subs, I have an alternate suggestion: use an adjustable crossover instead. Get one which allows the highpass frequency to the satellites to be different from the lowpass frequency to the subs. Ideally, get a unit which will let you adjust the crossover slope. Between subs and satellites, there is a lot of overlap, and controlling the crossover will let you control the response. For example, if there is a peak at the crossover frequency, spread the frequencies apart (i.e. lowpass at 60 but highpass at 100 or whatever) and the peak will reduce. It's an old car audio trick but applicable at home as well.

The reason I suggest that is that in the bass range, most problems are caused in the time domain by reflections and standing waves. Typical graphic EQs work in the frequency domain, and can't really address those problems. An exception would be something like the Audyssey EQ which IS time-based.

A parametric EQ can still have to value to cut a remaining peak or two. And remember-sharp response dips are generally due to acoustic cancellation, so don't try to boost those frequencies with an EQ. Those dips need to be fixed by changing the crossover or phase or room position and acoustics.
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Old 23rd January 2010, 08:26 PM   #9
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Something like the Reckhorn sounds fine, but is it suitable for use with a single RCA sub out from an AV reciever?

Being able to sum the mono bass out to two power amps would be handy. But the main requirement is for the high pass/rumble filter/dooh dah. I want to be able to adjust the low bass is some way, such as a switchable filter to cut the bass at 25Hz or 20Hz or 17Hz or 14Hz as examples. for instance a current design I want to build could use a rumble filter/High pass at 17Hz, another at 20Hz a future build maybe 14Hz?

Protecting the bass drivers from over excursion is the main reason for this.

Something available in the UK would be prefereable.
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Old 24th January 2010, 06:36 AM   #10
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Yes it should be suitable.

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