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In Reply to: RE: Final resolution of the Maggie Question posted by wbeau@yahoo.com on December 16, 2014 at 18:56:57
The Dyna III can do your top if you biamp (I have one too), but if you triamp you will need either a resistor or a spelz autoformer in order to drive the tweeter alone. It should be able to drive the midrange alone.
The Quad 909 should do well for the bass panel.
The CJ preamp is probably a good choice for the top, and the Dyna PAS 2 should get updated thoroughly either by Tutay or another experienced modster. Van Alstyne has an update kit for the PAS 2 if you want to DIY.
I would put the black widow on the Micro table and the AT24 on the arm assuming you have a line contact stylus on the AT24. You can get a an SAS stylus from Jico in Japan for The V15 if you don't have an intact stylus. It is a very good cartridge, and you can bypass the phono input and output connectors on the PAS2 and hard wire them to your interconnects if your PAS 2 is in working order. The old connectors fuzz things up.
Follow Ups:
What!!!! No love for my DB Systems Pre-Amp????
When I was in the business (shortly after mono records were phased out) I was associated with a regional chain. THE solid state pre-amp was the Mark Levinson. Quiet, detailed, and pricey. Along comes this guy Dave Hadaway from New Hampshire with a hand made preamp in a little silver aluminum hobby box and BOOM!!! All the guys in all the stores lusted after one. Dave went into production and that is the DB Systems Pre-Amp. It held up very well to the Levenson and the Audio Research stuff and was a bargain at the price. It was quite the item. Dave still makes them (along with power amps and switches and MC Pre Pre Amps and such up in NH.
In order to by-amp, I'd need the XO-1 crossover which I don't have. I also would want to know the phase relationship of the dissimilar amps as well as their gain. Plus the MK III's would limit the dynamic range due to their lower power output. Since the high frequency amp drives the tweeter and mid-range from 200 hz up, its wide bandpass compared to the narrow bandpass of the woofer amp means that it should be approximately equal in power to the base amp.
I'll probably try both amps and if the QUAD is as good through the middle and top as I believe it will be, then I'll try to swap my MK III's for another QUAD 909 and bi-amp that way.
I Just don't remember the DB preamp. I was just a kid then.
My Audio Illusions Dual Mono preamp does date from then but much of its contents has been upgraded since. Though we didn't alter the circuit. It is a Bruce Moore design. I used it with a Dayton Wright transistor MC step up - with my Technics 1600 II and epc205 Mk4 cartridge (does not need the MC pre pre) and the Tympani IV (1982) it makes for a great retro system but the front end still outdoes the best digital I have come across, the revised PS Audio Perfect Wave DSD DAC. All this technology advancement and we might soon catch up with 1978.
Is the DB preamp updated?
The XO for the speakr is 500 hz so you don't need the same power on top as you might on the bottom. The Dyna should do it ok for normal vol listening.
You don't want the original XO at all. You should either get Marchand to build you an XM44 or get a Pass First Watt B4 crossover - it is fully adjustable to any XO up to 4th order, and costs a fraction of the fancy Pass labs version.
You can also do a hybrid XO using the DB pre as a buffer for the bass XO, which will need a 3rd order passive network, executed as 2nd order before the pre and 1st order after the pre. That combines into the same filter as the original.
500hz is very near the 50:50 power distribution point.
Maybe about 45:55 Lo:Hi
I have identical amps on my 600hz crossover 1.6s and with a low-cut to the bass panel at about 60 or 70hz, it works out very even indeed.
Too much is never enough
My Magnepan MG3A were rebuilt in the factory March 2008 at cost of $1000. I have the receipt/invoice for the service. Saw the ads in the asylum trader got it from a fellow inmate from Florida. The total cost of the speakers including shipping to my country (The Philippines) was less than $1000.
Im currently using them Biamplified ( a pair of ARC D79B's ,ARC EC21 Electronic Xover All tube) It sounds better w/ active Biamping (EC21) than using the stock XO-1 X over w/ a single amp.( My ARC CL 150 monoblocks or my D250 MK2 servo amp) .Have never tried biamping using the XO-1 Xover .
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