How to tell if an older amplifier will support 4ohm loads?

[Deleted member 69358]

For the system I am putting together for my daughter, I think a FOSI amp would not be ideal and am thinking of getting either a used AVR or an entry level AVR. For the used AVR's how do you know if it will support 4ohm speakers?

 

[staticV3]

Every User Manual has a page with specifications at the end, which usually state the supported load impedances.

 

[Blumlein 88]

Many/most will also have a notation on the back saying whether 4 ohm, 6 ohm or 8 ohm minimum. A few a have switch for 8 ohm/ 4ohm operation on the back.

 

[Deleted member 69358]

Every User Manual has a page with specifications at the end, which usually state the supported load impedances.

Some of them do not specify but have a "dynamic output" for 2/4/6/8 ohms

 

[DVDdoug]

Too-low impedance is "reasonably safe" as long as you aren't using full-power. How loud does your daughter like to listen? Personally, I'd take the risk if you can find a cheap used AVR.

If you're lucky it will go safely into protection mode and shut-down when pushed too hard. If you are unlucky it might burn up, and if it was cheap you've lost a little money.



...I'm running big 4-Ohm (passive) subwoofers with an older "8-Ohm" amplifier. I can "shake the walls" but I'm not pushing it to the max. (I have near-by neighbors, and I'm not a kid anymore, and I'm not trying to blow my ears out!)

 

[Deleted member 69358]

Too-low impedance is "reasonably safe" as long as you aren't using full-power. How loud does your daughter like to listen? Personally, I'd take the risk if you can find a cheap used AVR.

If you're lucky it will go safely into protection mode and shut-down when pushed too hard. If you are unlucky it might burn up, and if it was cheap you've lost a little money.



...I'm running big 4-Ohm (passive) subwoofers with an older "8-Ohm" amplifier. I can "shake the walls" but I'm not pushing it to the max. (I have near-by neighbors, and I'm not a kid anymore, and I'm not trying to blow my ears out!)

She is sensitive to loud sounds so will never play very loud. It is an old Pioneer pro-logic receiver 100wpc. Total cost should be around $40. Maybe I will rethink the speakers. She listens to records and spotify.

I so wish those Fosi amps had remote control and way to secure Bluetooth. Don't like that anyone can connect to them and start playing music.