Mod a Marchand XM9 Electronic Crossover

slhijb · 7th September 2008, 02:36 PM

Please be patient, I’m 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:
OPA2134
OPA627 or
LM4562

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

XM9 Schematic: http://www.marchandelec.com/ftp/xm9man.pdf

slhijb · 7th September 2008, 11:42 PM

Anyone out there modded or upgraded a Marchand?

planet10 · 8th September 2008, 02:19 AM

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.

dave

djk · 8th September 2008, 10:48 AM

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.

slhijb · 9th September 2008, 12:06 PM

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.

http://www.referenceaudiomods.com/Me...ry_Code=OPAMPS

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

7th September 2008, 02:36 PM	#1
slhijb diyAudio Member Join Date: Aug 2006	Mod a Marchand XM9 Electronic Crossover Please be patient, I’m 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: OPA2134 OPA627 or LM4562 Any other suggestions on how best to upgrade or modify the Marchand XM9 are greatly appreciated. XM9 Schematic: http://www.marchandelec.com/ftp/xm9man.pdf

8th September 2008, 02:19 AM	#3
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	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. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

8th September 2008, 10:48 AM	#4
djk diyAudio Member Join Date: Feb 2001 Location: USA	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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7th September 2008, 11:42 PM	#2
slhijb diyAudio Member Join Date: Aug 2006	Anyone out there modded or upgraded a Marchand?

9th September 2008, 12:06 PM	#5
slhijb diyAudio Member Join Date: Aug 2006	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. http://www.referenceaudiomods.com/Me...ry_Code=OPAMPS Also, any thoughts on cap or resistor upgrades? Is it worth my while?

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