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Powering Infinity Prelude MTS

Wanted some input on how you's with the MTS are powering them and which way you prefer.

Do you power them with just speaker outputs from your amp?
Do you power them with the output from your preamp and then your amp?
There may be some with other type systems... chime in.
Which do you prefer? Why?

Have been trying both ways and can't really tell much of a difference except for the bass.

Seems like I get a little more bottom end with direct from my amp.

Short info on my 2-channel system...

Speakers: Infinity Prelude MTS
Preamp: Krell Audio Video Standard
Amp: Krell KSA-250
Cables: Monster Sigma
joysjane

Showing 9 responses by jburidan

jburidan
672 posts
 
Agree these are very beautiful speakers. I drive mine with 12 watt Wavelength Cardinal 300B monoblocks, and haven't had voice-coil failure. I don't have them toed-in.

For owners that have had problems, it's a shame that Harman Kardon doesn't provide better parts support.
jburidan
672 posts
 
Did you know that the Infinity RABOS website has a calculator that computes the settings when you input the meter readings?

The RABOS means that the distance from the back wall isn't critical. I recommend no toe-in. The listening position should make a close triangle with the distance between the towers, e.g., if towers are 7' feet apart, then your ears should be circa 8' back from the center point between the towers.

I doubt that the volume knob was a QC issue. Are you the first owner?
jburidan
672 posts
 
The original spikes screw in. Sp the first owner must have glued after-market spikes on them. If you're handy, recommend you try to fix the volume knob yourself. Also, when you do the RABOS measurements, make sure the tiny pots are all in the fully clockwise position. I love these speakers with 300B SET amps.
jburidan
672 posts
 
I own Tannoy 215 DMT II speakers rated sensitivity 101dB. Dual concentric 15" drivers with compression horn tweeters, i.e., one of the greatest speaker designs ever made. I love both the Tannoy and the Prelude MTS, but they sound totally different.
jburidan
672 posts
 
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.
jburidan
672 posts
 
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.
jburidan
672 posts
 
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.
jburidan
672 posts
 
Joysjane:

I think the plate amp is Class D, so it shouldn't radiate much heat in either case. I don't know much about Class D amps. But I think they were developed for automotive applications.
jburidan
672 posts
 
Thanks for the update. These are extremely good speakers. It's a shame that Harman quit making them.
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