You are here

Log in or register to post comments
imispgh
imispgh's picture
Offline
Last seen: 4 months 2 weeks ago
Joined: May 23 2006 - 10:37am
Tube amp- how can you tell if 4 or 8 ohms- higher volume? (with and without sub amp)

I have an AMC CVT-3030 30W tube amp and Triangle Celius 202 speakers (with and without an NHT MA-1 sub amp/sub). Do I use 4 or 8 ohm taps. The speakers nominal impedance is 8 ohms but it dips below 4. Leaving the volume in place the speakers sound louder using the 8 ohm tap. Does that mean anything?

I run the Celius full range because crossing over at 105hz doesn't seem right? But that means the amp sees the Celius and the MA-1 sub amps speaker level input. How if at all does that change the answer?

tmsorosk
tmsorosk's picture
Offline
Last seen: 1 month 1 day ago
Joined: Dec 5 2010 - 12:34pm
4 ohm

If your speaker dips below 4ohm than the 4 ohm tap will likely work best . Don't worry about the loudness level , which ever sounds best is the way to go .

Your second question makes me think your running the sub from it's high level input , it is not usually recommended with tube amps , do you have a low level input on your sub ? if you do try it , the system should sound better that way . 

imispgh
imispgh's picture
Offline
Last seen: 4 months 2 weeks ago
Joined: May 23 2006 - 10:37am
Thanks for the response Why

Thanks for the response

Why doesn't the level matter? Doesn't that indicate a better match/energy transfer?

As for sounding better the 4 ohm tap drops the high end a bit.  But that isn't where the 3ohm dip is.  Wouldn't I really only hear a difference the more the specific dip freq is used? Given that if it's not in the critical range then doesn't power transfer ease become paramount?

Why is the speaker level connection an issue? This input on the sub amp is a high impedence. In parallel it actually rasies the total a bit closer or over 8 ohms - isn't that good for a tube amp.  Interestingly enough AMC told me to run the speakers full range with the speaker level sub tap. The amp sees my Triangle Celius full range and the sub input in parallel.  Given the sub amp has a higher impedance and draws no current because it is only a coupling input I figured the slightly net higher imp would be good or at least not a bad thing?

  • X
    Enter your Stereophile.com username.
    Enter the password that accompanies your username.
    Loading