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The Hafler amp seems to handle the load quite well. It gets quite warm but I wouldn't say hot. I have a second Hafler 9505 currently not in use. I am considering adding it into the system, strapping both amps mono, one for left channel one for right. Good idea or not? What do you think? I invite all responses.
I’m using a 9505(modded), to run my woofers. Stock, they put out 375 WPC, into a 4 Ohm load. Page 2 of the manual states they don’t recommend trying to run less than an 8 Ohm load, when bridged. http://www.hafler.com/pdf/archive/MAN0587D_9303_9505_man.pdf Look at page 8, of the following, with regards to biamping your 3.5s. That would be the ticket, given you’ve two 9505s. Finding the XO-1 crossover, might be an issue, unless Magnepan still offers them. Page 10 tells you how to bi-wire(much easier/not as beneficial). http://www.integracoustics.com/MUG/MUG/pix/mg3.5_manual.pdf It seems some have had difficulties, with the 3.5 and XO-1: https://www.audioasylum.com/cgi/vt.mpl?f=mug&m=179681
Another option, if you want to actively bi-amp. I used(and modded) one for over two decades, without a problem and with great results. They can be hard to find though. Regnar(some of the original Dahlquist personnel) still does updates to them: http://www.allegrosound.com/Dahlquist_DQ-LP1_AllegroSound.html and http://www.regnar.com/dahlquist-dq-lp1-parts---upgrades.html