• Hello and Welcome to HiFiVision.com - an online community for the home entertainment and tech enthusiasts!

    If you would like to ask a question, participate in a discussion and view attachments please Register yourself.

One technical guideline for pre-power amps matching...

Home Theatre Systems

murali

Well-Known Member
Joined
Oct 5, 2008
Messages
501
Points
63
Location
India
Just was reading in a forum about the recommended ratio of input impedance of power amp to output impedance of preamp. A ratio of 10 is considered the minimum and 20 is recommended; the higher, the better.
Just to be aware that the impedances will vary based on single-ended or balanced connections and also based on volume control.
Trust this may be of help to someone interested in such technical trivia.
Thanks.
> murali
 

marsilians

Well-Known Member
Joined
Dec 8, 2008
Messages
2,642
Points
83
Location
117.192.87.109
You mean Solid State only right? The tubes do not align with these.

Most standard power amps (brand name as some woudl like to call) meet or exceed this.

A more realistic metric is speaker impedance match to the amps. If the speaker says 4 ohms there will be dips where it might hit 2 or even 1 ohm sometimes and the amps should be able to handle that. This happens for some musics like high pitched strings based music.

Also for everyone to remember, the more the wattage of a power amp, the better it will handle such variations since the transformers will be bigger or efficient.
 
Top