Adding sub question

Tls, thanks very much. I always enjoy reading your posts as well, which have struck me as knowledgeable, helpful, and well intended.

As you probably realize, the 47K figure you found in the manual would be a recommended load impedance, rather than an output impedance (or an input impedance, since the JD100a has no inputs), although it may have been described as an output impedance due to loose translation or whatever.

In any event, both the 47K and 100K figures are significantly higher than the 33K input impedance of the Classe preamp. So as Bob said just above it seems pretty clear that a significant impedance incompatibility is present, which is most likely a significant contributor to the problem.

Pkrbkr999, just saw your last post. I would keep in mind the possibility that multiple problems may be present, with the effects of the impedance incompatibility being masked by a different problem.

Also, while I'm not certain what you mean by having to "push" the Tylers to get the low end, keep in mind that the sensitivity of our hearing mechanisms to deep bass frequencies, relative to their sensitivity to mid-range frequencies, decreases as volume levels are decreased. The Fletcher-Munson Effect.

05-27-13: Tls49
My comments were merely to get him thinking about his system and the synergy, rather than just throwing subwoofers at it.

Excellent point, well said.

Best regards,
-- Al

What I mean is that both sub's will have there own separated channel. Right and left for stereo use. That is the only way I would go for 2 sub's. All the demo's I heard with 2 Velodyne sub's were quite worse. First they are slow has a turtle and second instruments and voices become too big in proportion. I can now use my sub from 16hz till 140 hz with ease. Without Audyssey Pro I never heard a sub integrate that good as it should be. Still I would love to have an acoustic system for 2 separated sub's for stereo use.

AFAIK, AudysseyPro, used with a AVR or prepro, will not accommodate stereo (separate) subwoofer EQ. (It will set individual delays and levels for two subs.)

What hardware are you using it with?

Al, and thank you very much. Sorry if I wasn’t technically correct stating what I found in CD player manual, but it is listed the same way as the website,
Line Output Voltage: >2V, 47 Kohms. Who knows what is correct, but you have confirmed that either is too high.

Pkrbkr999, you mention the fact that the top end is harsh. Some do have excellent results with Nordost, and love them. Again, from my experience with Nordost speaker cables and interconnects, I thought the top end was always a little rough, and I was able to achieve a much smoother top end with other brands. Please understand I am not saying cables are a solution to your problem, but that they may just be a piece of the puzzle.