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Old 26th September 2003, 09:08 AM   #1
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Default Active equalisation in full range speakers

Hi

Most of the discussions I've seen for active equalisation of the low frequency response of drivers in sealed cabinets has focused on subwoofers only. Has anyone applied this principle to conventional two-way (i.e., full range) speakers?

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Niall
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Old 26th September 2003, 11:47 AM   #2
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Hi Niall,

I've heard of people eq'ing the mid to make flat a few octaves below the x/o point (in order to use a 'textbook' filter..)

However I reckon a standard 6 inch used for a 2-way, (rather than a high-passed mid) would run out of excursion very quickly with a low end boost.

Cheers

Rob
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Old 26th September 2003, 11:53 AM   #3
SY is offline SY  United States
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Sure. Roy Allison, for one- the "Electronic Subwoofer" of 20 or 30 years ago. Bose, for the original 901.
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Old 26th September 2003, 07:43 PM   #4
RHosch is offline RHosch  United States
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Linkwitz's Pheonix and Orion speakers, both highly respected, use active equalization (partially for the dipole effect, and partially to treat a few resonances).
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Old 27th September 2003, 02:09 AM   #5
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Many people use active full range EQ. Do a search in the digital forum for Behringer DEQ2496.

The TACT units (www.tactaudio.com) are higher end room EQ systems and work very well.

Cheers

Steve
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Old 27th September 2003, 02:51 AM   #6
badman is offline badman  United States
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Default Important to note

If you're looking at EQing a fullranger, you want to make sure the active EQ is not operating at frequencies that are, say, more than 10 dB below the natural center of a +/- 3dB response curve (nominal sensitivity spec). Going much further than that will make the LF excursion of the driver dominate the drivers behavior, and really mess things up. Using an EQ to kill the 'lowther shout' however, might make a mediocre fullranger into a helluva good speaker. The breathy, foward aspects of many fullrange hifi drivers make them unlistenable to me, eqing them might make it more tolerable.

I'm working on a speaker that runs the mid full range and cap couples the tweeter, a la Reference DeCapo 3As, but has a better balanced sound than those or lowthers..... not 'shouty'....
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Old 27th September 2003, 06:31 AM   #7
navin is offline navin  India
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Quote:
Originally posted by SY
Sure. Roy Allison, for one- the "Electronic Subwoofer" of 20 or 30 years ago. Bose, for the original 901.
edgar vilchur (AR), henry kloss (KLH), etc... in the 60s-70s.
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Old 29th September 2003, 08:38 AM   #8
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Thanks for all the tips. As this is my first DIY project I think I will build my two way using a regular passive XO located outside the box, and then later I can play with active equalisation.
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Old 29th September 2003, 11:13 AM   #9
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There are problems with using eq to get more bass extension. In a vented box you would only get more extension by adding eq below tuning, and that gets ugly! Group delay goes through the roof as does the cone excursion and distortion - it is pushing the driver too far.

Eq is ok in sealed subs which have a large excursion and the group delay is already very low. Active eq is necessary in many speakers, but when you have a vented box you can't really eq it below tuning!

You could do it in a sealed 2 way, but there is really no point IMO - you loose extension by going sealed, then try to get it back with eq - no real gain, and probably higher distortion.
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Old 29th September 2003, 11:41 AM   #10
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paulspencer,

I thought the main point of using active EQ in a sealed box over a ported box was that the bass could be amplified/equalised over the whole low end frequency response (within reason) instead of just at the ports resonant frequency +/- a few hertz, thus giving a less boomy (one note) bass?
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