Why is it that?


Posted this on The Asylum as well.

I have a VPI Scout turntable with the JMW9 arm and a ZU DL103 low output moving coil cartridge. My preamp is an Audible Illusions Modulus 3B (their latest and greatest)the tubes which were bought from Audible Illusions are well broken in and the preamp has an excellent phono stage. I use a Denon AU320 SUT between the turntable and the preamp. VPI phono cable is used for the connections from the turntable to the SUT and from the SUT to the turntable.
The cartridge is rated to be used at 40 ohms and my SUT has settings for both 40 and 3 ohms. Besides the significantly lower volume when using the 40 ohm setting, the sound seems a bit more romantic and rich which is good for certain kinds of music. However, when I play my rock from the late 60's up to present, I much prefer the 3 ohm setting as it seems to give me a more lively sound with a little more snap.

What are the differences between the 40 ohms and 3 ohms settings? Is one setting more right or wrong than the other, and why? Eventually, I plan on getting a Bob's Devices SUT, or have the John Curl designed moving coil preamp removed off my Modulus 3A preamp, and put on my Modulus 3B preamp. I am leaning towards the Bobs Devices as it will still allow me to use a moving magnet on the turntable by removing the SUT. Once the mc phono board are installed on the Audible Illusions preamp, you are stuck with using low output moving coils only.

Enlighten me please?
128x128stereo5
Stereo5,

Sorry about that. From your post, it looked to me that your preamp was over 20 years old. I don't really follow the model numbers close enough to pick that up. Now I see your issue. It may very well make sense to go with a SUT. I still wouldn't lock myself into one, though. You may want to give The Cable Company a call. They should have some phono preamps and SUT's t lend you so that you can try them in your system first. I use them all the time for this type of thing.
Dear Zd,
The debate over "separates" vs full-function preamplifiers is a never-ending one, but suffice to say that there are many advantages to an all in one unit vs separate phono and linestages and vice-versa. But why would you expect "better synergy" and saving money to be advantages associated with separates over an all in one preamplifier? Most assuredly, those would be points in favor of the latter choice. Two more advantages are avoiding purchase and use of a costly, signal degrading interconnect, and the fact that a separate phono stage usually needs a buffer stage to drive said interconnect. The very short internal signal wires used in a full-function preamp to connect its phono section to its linestage can often be implemented in such a way as to avoid a buffer stage.
An interesting yet stimulating conundrum, indeed. " My preamp is an Audible Illusions Modulus 3B (their latest and greatest)" Contact AI directly. Ditch the 3b for the 4a or upgrade your backup AI3a to the AI4a (minus the JC board) then implement a top tier external phono stage. Enjoy immensely.
Lewm,

I tend to agree with what you are saying. As I stated in my last post, my comments were based on me being under the impression that the OP had a 23 year old preamp. With regards to the cost/synergy issue, I gave an example of the DV cart and phono pre. I just think its a good example of how to get great sound at a reasonable cost. Personally, I feel that there is probably an advantage to having 1 company make both products; definitely in terms of synergy, and possibly cost. You have to really take it on a case by case basis.

"But why would you expect "better synergy" and saving money to be advantages associated with separates over an all in one preamplifier?"

I wouldn't. Like I said above, you need to take it on a case by case basis. I probably wasn't clear about that, though. I was just referring to something like the DV combo I used as an example.

"Two more advantages are avoiding purchase and use of a costly, signal degrading interconnect, and the fact that a separate phono stage usually needs a buffer stage to drive said interconnect. The very short internal signal wires used in a full-function preamp to connect its phono section to its linestage can often be implemented in such a way as to avoid a buffer stage."

On this last part, we may have a real disagreement. I try not to lock myself in to general statements like this. For me, it all depends on what the equipment is and how it sounds. If it means doing it the above way that you suggest, that's OK. But if I think another way sounds better, that's OK too. I would venture to say that you may agree with me on that last statement, but I won't put words in your mouth.