Ortofon carts are too hot for my phono preamp?


When I need hardware advice, I always come to Audiogon for the true experts.  Thanks in advance and happy Easter!

So after much trial and error, I THINK I have deduced that my Ortofon 2M Bronze and 2M Black cartridges are too hot for my Avid Pulsus phono preamp.  Some softer recordings are fine, but I think I am hearing some distortion with loud transients and even sometimes on relatively loud vocals.

I have a Pro-ject tube phono preamp I swap in and I don’ t hear that distortion. I never hear that distortion with other sources. 

Given my investment in 3 Ortofon 2M carts (1 Bronze, 1 Black, 1 Black SE) and the Pulsus, is there anything I can do to step down that signal from the carts without doing any damage to the sound?  

Any other thoughts?

(BTW the 2 turntables I am using are a Rega P3/24 and an older Rotel.  Meridian preamp has variable gain settings on inputs and I can hear the distortion at any setting.)

jji666

"The Pro-ject phonostage sounds OK...but it isn’t at the same level that the Pulsus is "supposed" to be...at least judging by price and reviews."  

That is no guarantee that it will sound good in your system!

"Bill, Not a good idea because of capacitance.  Capacitance will cause a HF roll off probably before you notice a loss of gain."

I agree, my idea was to test to see if a loss of gain helped by using a set of long cables if they are available.  Then having a pair of phono cables made with an increase in resistance, but by being normal length not an increase in capacitance.  Steven Huang who owns Audio Sensibility in Toronto is an electrical engineer and my go-to guy for all things wire.  I believe he may be able to help.

It’s interesting to read that the original poster found Ortofon’s too bright. Through my NAD phono preamp I find Ortofon’s flat and rolled off at the top. Much better synergy with AT’s and Goldring’s. I guess everyone experiences sound differently.

Not too bright, actually. There's no sibilance, for example.

Too hot - as in loud transients and other loud passages seem to be creating distortion, and doesn't seem to occur with my other phono pre.  

In general, I enjoy the sound.  But every third or fourth LP, maybe the louder ones, seem to have some distortion. 

As above I am also adjusting my line stage to see if a higher input setting helps reduce it.  Ran out of time yesterday...

Excessive capacitance with a MM cartridge will cause a peak in the audible range before any roll off at the top of the range, and this will be perceived as added brightness.

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