Weak ROTEL phono section

If the cd works ok,there shouldn't be any problems with the balanced outputs to your amp,otherwise the cd would show the same characteristics.If your new to vinyl,it maybe the difference in dynamic range.When cd's first came out,I thought I was going to blow my speakers(plus have a heart attack)the first time I played a cd at home.I imagine if I was new to vinyl,I may think it sounds weak at first if I was used to cd's only. If its a new cartridge,it may sound different from your old one.I don't have all the knowledge like Almarg does,but I've been through a lot of different audio equipment also,and like he says,the volume difference has been common for me also.Hopefully its nothing so you can enjoy the music.

Thank you for these excellent, helpful posts.

I think you're both right, but I don't know, having to put the volume at 3 o'clock with such a "hot" cartridge doesn't quite add up.

I'm not expecting "cd volume" but a little more would help.

You're welcome! Another contributing factor is that the power amp, according to the specs in its manual, has an input sensitivity (for full power, and for the unbalanced inputs) of 1.6 volts (3.2 volts for the balanced inputs), while the specified output of the preamp is 1 volt. That results in having to set the volume control higher (for both phono and cd) than you would have to if the preamp had a higher output and/or the power amp had a lower sensitivity number.

Using the balanced inputs won't change that -- you'll probably have 2 volts out of the preamp (between the "hot" and "cold" signal polarities, instead of 1 volt between signal and ground in unbalanced mode), but the power amp sensitivity changes correspondingly (from 1.6 volts to 3.2 volts).

Regards,
-- Al

Thanks all.
Thanks Almarg,
I'm wondering if an outboard phono preamp might help. Success would depend on whether the phono output is higher than that of the Rotel.

Yes, a properly chosen outboard phono stage probably would help.

The phono section of your Rotel presumably amplifies a 2.5mv input up to the specified line-level input sensitivity of 150mv. That corresponds to a gain of 20log(150/2.5) = 35.6db, which is somewhat less than the 40db or so that typifies moving magnet phono stage gains.

The line stage of your Rotel provides a gain of 20log(1/0.150) = 16.5db, which is fairly typical (although the gains of preamp line stages vary widely from model to model).

So if you were to obtain a phono stage that provided gain in the low to mid 40's in db terms, while also providing 47K input impedance to be compatible with your moving magnet cartridge, you could reduce the volume control setting by the difference between that gain and 35.6db. Keep in mind the rough rule of thumb that a 10db volume increase corresponds to a subjective perception of "twice as loud."

Audio Advisor has a selection of phono stages you may want to consider.

Regards,
-- Al