Active crossover : Quad 22L modification

jacklelad · 27th July 2005, 06:26 PM

Hi,

Does anyone have any views on the potential benefits of modifying the Quad 22L's for active crossover and bi or tri-amping ? And how to go about it ?

Thanks Jack

lufbramatt · 28th July 2005, 05:28 PM

hi
assuming the 22L's use the same crossover topology as the 11L's, then im not sure there would be much to be gained. I took apart an 11L last week due to the sun melting the insulation on the transformer on a mates valve amp and frying a voice coil. The 11L's use the mechanical rolloff of the midwoofer (ie no passive components) and have a first order filter on the tweeter with just one capacitor.
Assuming quad have picked the midwoofer because it has a nice even rolloff and no real cone breakup, using an active xo to give a higher db/oct crossover may not give any real benefits as it would if there was a large xo network with lots of components.

just my 2 cents

27th July 2005, 06:26 PM	#1
jacklelad diyAudio Member Join Date: Jul 2005 Location: london	Active crossover : Quad 22L modification Hi, Does anyone have any views on the potential benefits of modifying the Quad 22L's for active crossover and bi or tri-amping ? And how to go about it ? Thanks Jack

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28th July 2005, 05:28 PM	#2
lufbramatt diyAudio Member Join Date: Jan 2005 Location: loughborough/ rochester	hi assuming the 22L's use the same crossover topology as the 11L's, then im not sure there would be much to be gained. I took apart an 11L last week due to the sun melting the insulation on the transformer on a mates valve amp and frying a voice coil. The 11L's use the mechanical rolloff of the midwoofer (ie no passive components) and have a first order filter on the tweeter with just one capacitor. Assuming quad have picked the midwoofer because it has a nice even rolloff and no real cone breakup, using an active xo to give a higher db/oct crossover may not give any real benefits as it would if there was a large xo network with lots of components. just my 2 cents

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