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In Reply to: RE: Biamping for maggie 20.1 with two macs vs bridged amps posted by dromney on September 04, 2016 at 09:26:44
I don't think you need to work hard on the subject of biamping. So far I have found one person to have preferred single amping a maggie. But then he hand tweaked the passive crossover to taste over years. The execution is easy enough once you have the amps at hand. As for the line level XO choices you can get
1. an AR crossover designed for maggies and give them the model and send it in for a checkup and to put in the appropriate components for your model's XO It has an active low pass for bass and a passive high pass for mid/tweeter
2. use a First Watt B4 crossover for max flexibility in choosing both freq and slope,
3. Have Marchand build you an XM 44 with the right crossover to emulate the OEM crossover
4. Do a DIY passive high pass and active 3rd order low pass - or just get a used 3rd order vintage 3rd order XO from Ashly Furman Pioneer Sony Yamaha Accuphase etc.
5. If your budget reaches that far the Pass XVR1 crossover will do an excellent job.
Follow Ups:
Satie, I am going to look into it. When bi-amping I would use one amp for the bass (one channel for each speaker) and one amp for the mid and highs, correct? It seems that for a single amp dedicated to a channel I would have the majority of the 800W available to support the bass panels on each speaker, and if I bi-amped, I would then be limiting myself to 400W/speaker bass panel? I must not be understanding something about how to apply this, as this seems to actually limit head room.
That is entirely correct. However, you should have the top amp loafing in its best performance where you will find more clarity than you imagined possible. While the bass amp will be often driven to the end of its tether and will be producing some distortion - but the bass panels produce quite a bit of it themselves at the bottom octave - 25-30% at high volume 30-40 hz has been measured. So you don't really care about the bass amp being stretched. The main downside is that it might sag on very low freq loud material and provide woolly bass. in which case you can easily flip the extra Mac for a higher output bass amp - where you don't care about its refinement in the midrange etc..The large Emotiva, XPA and quite a few Pro Audio and Audiophile high power pieces can fill the slot. I use a fan cooled linear Crown 5002VZ for my bass panels. I have clipped everything else including a parallel strapped Classe DR 9 (rated 400W but measured 600), Bryston 4B NRB bridged and stereo.
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