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What about the other way around?

Hey everyone,

I understand that an SS amp in general will double (or some percentage of doubling) in output when going from 8 to 4 ohms.
What about the other way around?

Assuming the reverse is true that wattage output will be halved as resistance doubles, would a pair of 15 ohm Rogers LS3/5As (82.5dB/W/M) be too much of a load for a 50 wpc Forte 1A?
With ~25 wpc, should I be concerned about clipping?

This is for a possible bedroom (12' x 16') setup.  Semi near field (about 6' or 7' away) classical, jazz and some light rock listening at low to moderate volumes.
 
Thanks!
hleeid
russ69's avatar
russ69
3,543 posts
 
"...I understand that an SS amp in general will double (or some percentage of doubling) in output when going from 8 to 4 ohms..."

Generalizations can be a dangerous thing, it's best to go by the specs for your amp than to make generalizations. I think you'll be fine with the Forte1A.

"...should I be concerned about clipping?..."
You should always be concerned about clipping but play at reasonable volumes and you'll save yourself a lot of problems. 
hleeid OP
219 posts
 
Thanks for the responses!

Think I will go ahead with the bedroom system.

I also have a 60 wpc Jolida SJ502A tube integrated.  
Doesn't look like impedance affects output for tube amps like with SS.
But it also doesn't hurt to ask.

There are 4 and 8 ohm posts on the back.  Would the higher impedance speakers be more ''efficient'' on the 4 ohm posts?

How would the different impedance whether using different posts or different speaker loads affect the output for tube amps?


russ69's avatar
russ69
3,543 posts
 
"...Would the higher impedance speakers be more ''efficient'' on the 4 ohm posts?..."
No.

"...How would the different impedance whether using different posts or different speaker loads affect the output for tube amps?..."
A tube amp can change frequency response due to the impedance the amp drives. Try each one and use the one that sounds best.
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