Powering Infinity Prelude MTS

Yes, the 215 DMT II is a huge professional studio monitor, a.k.a. the poor man's Westminster. They look ugly unless soffet-mounted, but sound wonderful. and express every nuance even at very low volume. The Art Audio Jota HC amps with 300BXLS tube drives them nicely.

Hey again Viajero5000,

I did a little experimenting with hooking up the Preludes via the separate component guide in the owner's manual. The bass modules driven with the preamp using the internal 850w internal amplifier.

I found that the bass amp in the Infinity's didn't have the control over the woofers as well as the Krell amp does.
Was listening to an SACD of Boston and had the woofers reaching their limits and started to distort. Granted that's at quite loud listening levels. At that same level I had no such issues with the KSA-250.

You would think the 850w BASH Amp inside those subs would outperform the 250w of Krell amplification. Not so!

Will be going back to hooking up the Infinity's directly from the amp.

One hook-up sends line-level signal to the BASH. Second hook-up sends speaker-level signal to the BASH. Either way, BASH powers the MTS sub. I might be mistaken, but I'm pretty sure.

Hi Joysjane, my understanding is also the same as Jburidan's... feeding the signal from the amp does not cause the sub-woofer amps to be over-ridden by the external amp, the subs are always self powered. I'm guessing what you may be hearing is the difference between the amplified vs the unamplified signal. Perhaps it may be worth checking what the speakers' user manual recommends between the two?

An engineer from Harman who helped me with the initial system set-up, recommended using line-level to the sub. If you switched to speaker-level, I believe you'd have to re-run the RABOS CD tracks for making the final system adjustment.