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Eq before or after crossover? |
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mace.ben 
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 Topic: Eq before or after crossover?Posted: 23 March 2011 at 10:26pm |
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As per thread title really. In need of a little pointer.. Eq before or after crossover?
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bass*en*mass
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Joined: 03 September 2009 Location: "unknown" Status: Offline Points: 4009 |
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Posted: 23 March 2011 at 10:30pm |
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before obviously :)
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jonny2bad4509
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Posted: 23 March 2011 at 10:30pm |
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b4 as you need to connect the out from x over to amp/amps
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Bomeranks Sound The Party Sound
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patrickman123
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Posted: 23 March 2011 at 10:49pm |
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you go from your mixer into your eq then from your eq into your crossover and then from your crossover into your amps
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"Thats what she said"
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Speaker Sol
Young Croc 
Joined: 15 September 2009 Location: Ireland Status: Offline Points: 1320 |
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Posted: 23 March 2011 at 10:51pm |
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EQ post crossover can alter the crossover point's, both through phase shift and spectral balance.
I used post crossover EQ to correct anomaly's with the specific loudspeaker, but I do this as part of the process of setting up the crossover. For more information I suggest reading Bob McCarthy's "Sound System Design and Optimization"
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Speaker Sol
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Posted: 23 March 2011 at 10:52pm |
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I then use Pre Crossover EQ as a general EQ for room correction (as a last resort) and or system Toning.
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Steve_B
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Posted: 24 March 2011 at 12:43am |
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Is this eq applied in a loudspeaker management system (DXC,
Driverack, etc), or a graphic? If you are setting up a system using the former, eq on the
output, which is effectively AFTER the cross-over, is extremely useful. A resonance peak
just outside the operating band of a drive unit can still influence the
response and eq can be beneficial. If this was corrected before the cross-over
the eq would also affect the drive unit in the adjacent band even though it
might not need any eq. This would still work by inserting a separate eq (possibly
graphic) between the crossover and amplifier, but you would need a separate device
for each frequency band. If you are asking about a single graphic eq, then as others
have said for maximum benefit inserting it between the mixer and cross-over
would be best. |
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vertx
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Joined: 14 March 2012 Location: Sydney Status: Offline Points: 578 |
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Posted: 10 November 2017 at 7:53am |
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So if I wanted to, for instance, tame some 2.5/2.6khz on my compression driver with a sharp PEQ dip, is it best to do this on my LMS input EQ or LMS output channel EQ?
I'm guessing EQ on the LMS input effects phase of the whole input signal around the PEQ freq? If I have phase aligned my LMS channel outputs without this PEQ dip, and add the PEQ dip in to the LMS channel output for the compression driver, this PEQ could possibly shift my phase out of alignment again? If this is the case, should I then be adding the PEQ dip to the LMS inputs? (In the event I am unable to re-phase align outputs at this time post LMS output channel PEQ) |
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Phil B
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Joined: 21 November 2004 Location: Melbourne Status: Offline Points: 2328 |
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Posted: 10 November 2017 at 8:40am |
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EQ in the LMS for the loudspeaker.
Eq before the LMs for the room Always been my rule .p.
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toastyghost
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Posted: 10 November 2017 at 2:04pm |
Driver / box section EQ should be done before alignment, but if it's just a case of tuning to taste then input EQ is fine, and will preserve your alignment. Or do it on a desk. |
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vertx wrote: