Adding sub question

I emphatically second Kal's (KR4's) comment just above. Cables are not the answer. However, in this specific case I think that the following comment may be particularly applicable, although for different reasons than were speculated:

05-26-13: Tls49
After looking at your system, I wonder if you are getting all the bass the Tyler’s are capable of producing. Please keep in mind, I think you have a nice system, and just asking questions about synergy.

Specifically, I see here that your Jolida JD100a CD player has its rated output voltage specified on the basis of a 100K load. While the input impedance of the unbalanced inputs of your Classe CP-35 is indicated in the manual as being 33K.

The CD player evidently has a tube-based output stage, which presumably includes an output coupling capacitor. The reference to 100K loading strongly suggests that the value of that capacitor is such that there is a substantial rise in output impedance at deep bass frequencies. That will result in a significant deep bass rolloff if the input impedance of the preamp is not high enough. Given the relatively low input impedance of the CP-35, I suspect that effect is at least a significant contributor to the problem, if not entirely responsible.

I would suggest that before making any decisions about how to proceed you first try to borrow or obtain a different CD player, preferably one having a solid state output stage (and therefore presumably a much lower output impedance), and see what kind of deep bass response it provides in your system.

Regards,
-- Al

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