2. amps-preamps
  3. 1052182366

need help with impedance on SF power 2

I just get a Sonic Frontier power 2 and Genesis APM-1. On the manu, APM-1 impedance is 4 ohms and I am not sure what is the normal impedance for power 2. Is all SF power amp @ 8 ohms. I read on the manu said I have to make sure impedance match with speaker. What effect if I have 8 ohms on the amp and 4 ohms on the speaker? I felt like I need to turn up the volume quite high in order to get a good sound level. BTW, the APM-1 is 90db sensitivity.
waip7

Showing 3 responses by waip7

waip7 OP
11 posts
 
Thanks, I am going to try it. BTW, is the SF power 2 is OTL or it will alway keep the same power output(110w) in 2, 4 or 8. Which means, even I drop the ohms to 4, I still get 110w (not higher). Will that drop make the amp run not as stable or sound not as good?
waip7 OP
11 posts
 
Thank you, Gsselling & Kana813. The power 2 I got is actually SE version, they use the kt88. If I put it on 8 omh tap, will it shorten the life of the tube?
waip7 OP
11 posts
 
I set up every thing today and put the power 2 into 8 phms tap. I also have a line 2 pre amp. However, I felt that i need to turn the volume up to 60-70 (line 2 volume control from 0-95) in order to get a enough volume level. I check the bias and it is right. Did I do some thing wrong? The APM-1 is a 5way speaker. It has its own amp for the 15" woofer. So, the power 2 just need to push two 6", one 5" and two 1". It should not need to push that hard. I am using the trivista as the source. Since the trivista doesn't have the xlr output. I put the RCA to line 2 and from line2 to power2 using the xlr. Will that cause any trouble?
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