anyone biamping with B&K ST-140?

Sean's info is correct as far as it goes. All the different versions sound different and probably shouldn't be mixed in a bi-amp situation. The 70 wpc and the first 2 versions of the 105 wpc amps look identical on the outside with gold lettering and silver handles. To identify them you will have to pop the lid and take a look inside. The last version is the one with red and blue lettering and is a completely different design. As Sean said it uses different output devices. While still rated at 105 wpc it uses 2 pair per channel as opposed to the earlier use of 1 pair per side. The circuit boards and internal layout are also different. Because of it's use of more outputs the newer design does not have the problem of insufficient current delivery into low impedence speakers that the early 105 wpc units did. Sonically they are similar but not identical. The older amps have a very sweet & palpable midrange with a slightly loose low end and somewhat unrefined top end. The newer version has most of the midrange magic with a much tighter bottom and sweeter top end. I own an early and a late 105 wpc version and have compared them extensively. They are both really nice sounding amps but in the long run I prefer the newer red and blue version slightly on most music. You wouldn't go wrong on either one though as this amp is the all time greatest giant killer bargain amp. Here is a partial list of amps that have been bettered by the little B&K in my system. Aragon 2004, Hafler Transnova 9300, Meitner STR-50, Sumo Andromada, Counterpoint SA-12, Denon 2200, ASL 1003, and several others I don't recall at the moment.

Perhaps B&K can give you the serial #'s that indicate changes?

has anyone biamped any of the paradigm studio speakers with two B&K ST-140 amps? i have a pair of the Studio 60v.2 and a pair of the Studio 40v.3. they are both powered by denon recievers. i recently auditioned a B&K ST-3140 (3*140watts) with these speakers and liked it alot, but couldn't justify an extra $500 for the amp when my denon 3802 sounded almost as good. i am thinking that biamping with 2 ST-140 amps will make my paradigms sound the way i want (not bright). anyone tried this set up before?

That darn sean!I thought that I was the B&K man because I use three in my HT rig,and have a spare in case one craps out.My serial numbers all range around #2900.They have a very warm sound that makes it quite easy to sustain three hours of lord of the rings.What my plans are for the three in active use is send them (drive them,I live near Buffalo)to B&K.Have them biased together.Then split the signal from my left,center,right and use one amp for each speaker up front.Remove the jumpers and one side will power highs and the other side will power the bass.Good luck.

Kg: My Brother is using an ST-140 for his tweeters, an ST-202+ for his mids, a dual mono ST-202 for his woofers and a dual mono 442 for his subs. All of the amps are heavily modified and actively crossed over at 24 dB's / octave. The speakers are a vertically mirror imaged array consisting of a tweeter located in the center, a 5" mid above and below that, a 9" woofer mounted above and below the mids. All of these drivers are Morel's, which he chose for their very low weight to motor structure ratio i.e. transient characteristics. The subs are mounted off to the sides of this vertical array and down-loaded. Each driver is housed in their own sealed and stuffed PVC tube to minimize crosstalk and reduce internal standing waves. This also allowed him to dial in the proper time alignment for each driver since each driver is in its' own housing. We did this with the aid of a digital room correction device i.e. hooked up the test equipment and adjusted the speakers for the least amount of necessary correction and then removed the digital correction devices. Like most of the things we have going on with audio in my family, it is a never-ending project : ) Sean
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