2. amps-preamps
  3. 1255561496

Amplifier input tech question

In my current system the volume control can only be turned
up to the 9 o'clock position or so, until the music is too
loud. The components are as follows;

cd- Rotel RCD-990 (transport only)
PS Audio DLIII with Cullen stage 4 mods

pre- Parasound JC 2

amp- Aragon 8008st

spks- KEF reference model 3

I am just starting to do my research for upgrading the
amplifier. And, would like to make certain that I select
an amp or amps that are less sensitive than the Aragon.
I have read about the minimum 10 times impedance difference
between pre-out and amp-in. But there must be more to it,
as the JC 2 output imp is stated as < 60 ohms and the
Aragon is listed as 22k ohms. My guess is that there is also a relationship between the preamp output voltage
and the amout of voltage the amp needs for full output.
Is there a formula I can use for finding a good match?
ska_man

Showing 5 responses by ska_man

ska_man OP
55 posts
 
Tpreaves,
The JC 2 manual suggests setting the amplifier gain controls (if any) so that the volume control on the JC 2
is between 11 o'clock and 1 o'clock during normal listening. That is (according to the manual) the "sweet
spot", where the channel tracking is closest & the distortion is lowest. As stated above, I intend to purchase
a new stereo amp or two mono block amps. The intent of the
question, is to learn about the impedance and voltage measurements and what they mean, as far as finding a good match. I will ultimately choose the amp or amps by ear,
but I do want to consider getting the JC 2 into its
"sweet spot".
ska_man OP
55 posts
 
Amandarae,

Thanks for your suggestion. I think that may be a little more radical approach to this issue than I'm willing to pursue. And, I am going to purchase a new amp or amps not
a new preamp.
ska_man OP
55 posts
 
Davehrab,
That makes perfect sense. Thank you so much for your
informative and exactly on point reply!
ska_man OP
55 posts
 
Almarg,
I have read many of your responses to other posts over the past several months, and I must say I feel somewhat honored that you replied to mine. Thank you for sharing your knowledge and wisdom, it is much appreciated!

ska_man OP
55 posts
 
My question has been answered and the Rothwell attenuators are in the process of being ordered. I will stop monitoring this thread at this time. But, do want to thank all who participated.

Abucktwoeighty, thanks for the tip about cable support.
I'll keep that in mind.
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