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Old 7th September 2008, 02:36 PM   #1
slhijb is offline slhijb  United States
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Default Mod a Marchand XM9 Electronic Crossover

Please be patient, Iím new to electronics. Want to modify a Marchand XM9 electronic Xover. Great unit, but a little bright in the treble region for my tastes. Looking at changing the opamps & would like your suggestions:

Currently using Dual Bi-Fet LF353. Possibly change to:
OPA627 or

Any other suggestions on how best to upgrade or modify the Marchand XM9 are greatly appreciated.

XM9 Schematic:
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Old 7th September 2008, 11:42 PM   #2
slhijb is offline slhijb  United States
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Anyone out there modded or upgraded a Marchand?
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Old 8th September 2008, 02:19 AM   #3
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I had one. I got the suggested upgrades from Marchand.

I thoy about a much better dual mono supply, but ended up selling it before i did any serious mods.

community sites,, ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
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Old 8th September 2008, 10:48 AM   #4
djk is offline djk
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Years ago I stuck OPA2604s in one instead of the LF353s, it made quite an improvement.

You may have some off-set with non-fet input opamps (LM4562) because of the lack of impedance matching on the IC inputs (not needed on FET inputs).

You might consider the AD823 too.
Candidates for the Darwin Award should not read this author.
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Old 9th September 2008, 12:06 PM   #5
slhijb is offline slhijb  United States
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Thanks Dave & DJK for the responses. I've continued research based on your comments DJK and think I'll try the AD825 J-FET Dual amplifier surface mount. Seems to be pretty much a drop in replacement and has good reviews.

Also, any thoughts on cap or resistor upgrades? Is it worth my while?
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