Impedance Mismatch ???


I have to say I`ve never ever even considered trying to make sure various components are matched impedance wise.
But I came upon a thread where it was said that the output impedance of the Preamp should be 10 times less than the input impedance of the Amp.
So out of curiosity I look up what my Preamp and Amp has for those numbers.
The Preamp shows 100 ohms output and the Amp input shows 33K.
What am I supposed to be hearing if there is something awry ??
I`ve been listening for a few years to this combo and I like what I hear,BUT, am I unknowingly compromising the sound or performance somehow ?
scm
Agree with Viridian that on paper you are in good shape.

FWIW, vendors that design amps to match well with most any pre-amp, including most higher output impedance tube pre-amps, may go even higher with their amps input impedance as an insurance policy, in that actual impedance varies with frequency. So, for example 100 ohm output impedance is a genralized measure across all frequencies. Impedance at some frequencies may be much higher, thereby lowering the ratio and potentially impacting sound.

My rule of thumb is 30K SS amp input impedance is towards the low end I would use to have a decent insurance policy against issues that specs may not reflect accurately,like actual impedance at specific frequencies.

FOr example, in researching Class D Icepower amps, 60K input impedance is designed into the Wyred amps to help assure optimal results with most tube pre-amps. The BEl Canto ref1000m amps I use have 100K (unbalanced) input impedance. Balanced is double that even as I recall.

My TAD amps have similar 30K or so input impedance as I recall. I could hear a difference in sound with those versus my BCs that might be attributable to input impedance. Hard to say for certain with two different overall amp designs.

So its possible you might hear some difference with say a similar SS amp with 60K or higher imput impedance.

Higher amp input impedance can often result in a relatively leaner sound. That may or may not sound best to an individual, depending on personal preference and synergy with system overall including speakers and room acoustics.

SO a lot depends. Regardless, being aware of impedance matching considerations is a best practice IMHO that might lead to some useful and perhaps even predictable comparisons of value over time.
Well Thank you Gentlemen for the quick reply and the analogy of the drumhead being struck helps nicely !
From now on, the impedance rating will be part of any amp and preamp that I might ventue on to.
Actually been looking around for a little while now and that`s how I stumbled across this subject !
Thanks again guys !
Strangely, Jeff Rowland increased ICEpower module input impedance from 10k to 40k by adding extra amplifier board on my model 102 amplifier but released brand new all his design model 625 that has only 10k input impedance. Does he know something we don't?
Adding an extra stage to increase input impedance to 40k probably degrades sound a little bit, so not doing so would be an improvement. The trade off is less compatibility with tube linestages which can have fairly high output impedances. Rowland may have decided that the tradeoff is worthwhile, either because of the performance gain and/or because tube linestages are unlikely to be used with that particular amp.
Could be.

I would probably not be concerned with most any amp input impedance 10K or higher for use with SS mainly. Use of higher output impedance tube pre-amps is the scenario that is more problematic. Tube pre-amps are popular with audiophiles these days but are probably still a very niche market overall. Many amps including stock Icepower have only 10K input impedance. That may just be the most practical approach with the most appeal.

I love the sound of my ARC tube pre but I am sure there are similarly good sounding SS pre-amps out there for reasonable cost as well. My next pre-amp I buy and keep someday will likely be SS as long as it is not a step backwards from teh ARC.

I say that because even my 30+ year old SS NAD 7020 receiver that I am using in my family room system today as a pre-amp only with the TAD Hibachi amps and OHM 100S3 speakers sounds very good, although it is guilty of a touch of that warmer sound that NAD can be known for. Its' my long time spare unit that I put it in to replace my similar older Carver pre-amp in that system when the Carver developed a problem needing repair. I would like to try a newer good quality SS pre-amp in there sometime soon when I can come up with a good justification at which time I might try a shootout for my ARC pre-amps place in my main system.