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milen007 31st May 2008 02:14 AM

what guideline to match pre and amp?
someone mentioning about damping factor of each associated gear, whats the guideline for that? some 10 times of the other? pre damping factor has to be around 10x of amp damping factor or vice versa?

or any other guideline?

will tube pre and SS power amp can preserve the tubey sound?

milen007 31st May 2008 03:04 AM

my pre output impedance is 200ohm while input impedance of my power amp is 500k ohm. thats 2500 x bigger. is this an ideal fit? they are from the same manufacturer. thx

Gordy 31st May 2008 10:10 AM


From the perspective of impedance loading, then 200 Ohms feeding into 500 k Ohms is excellent.


tubewade 31st May 2008 11:29 AM

There is generally no need for concern. As long as the input impedance of a device exceeds the output impedance of the preceding device everything will be OK. It is generally recommended to have a minimum ratio of 2:1 and it is usually preferred that the ratio be 10:1 or more.


ray_moth 31st May 2008 11:56 AM

Damping factor is relevant only for the output of the power amp to the speaker. It's the speaker that needs damping, by having a low impedance source.

Think of the speaker as a motor. If a low impedance power source is connected to a motor, then when the power is cut off the motor stops quickly - it is well damped electrically, If the power source is high impedance, then the motor will run on for a while if the power is cut off.

milen007 2nd June 2008 05:58 AM

so, is that mean that OTL T16 which has 1 ohm output impedance can drive any speaker thats 8 ohm and above?

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