ohm quick question

S.fasciani · #1 08-13-2009, 06:03 AM

I am running a acoustic image clarus II @ 2 ohm through an epifani 110 8 ohm cabinet.
I am hearing some high frequencey distortion and it seems i cant turn my amp up past 1-2 volume level without geting loud feedback.
Any info would be much appreciated?
cheers,
Sean

**Francois Blais** · #2 08-13-2009, 07:39 AM

How can you be running at 2 ohms if you only use a 8 ohms cabinet?
Do you have several cabs in parallel?

bonaventura · #3 08-13-2009, 08:35 AM

yes, if the clarus is driving one 8 ohm speaker, it is running at 8 ohms, isn't it? the clarus says printed on the back that it requires a minimum impedance of 2 ohms, but at 8 ohms you would be well above the minimum.

there could be lots of reasons for distortion. is your mic clamped on tight? as for feedback, that is a science in itself. if you use a mic, try pointing the speaker away from the direction the mic is facing.

johnz · #4 08-13-2009, 01:47 PM

I agree with bonaventura that it is unlikely that you have an impedance problem (although, saying that the that the clarus "tolerates" a minimum impedance of 2 ohms rather than saying it "requires" 2 ohms would avoid potential confusion).

I'm assuming that you are still using the realist as you state in your profile. I suspect that you've already checked these, but, just in case...

I found the realist was really good at low volumes. But, as the volume increased, the pickup got "muddy" and prone to low-frequency feedback. I had to aggressively adjust the bass and mid-range tone controls to compensate (don't forget the shelving control). This seems to be a common experience for realist users.

As for the distortion, is the bridge is sitting upright? If the bridge isn't sitting flat down on the realist, it can distortion; although, that's usually reported as a "buzzing" sound rather than distortion per say.

Assuming that you still have problems, I suggest that you will get more helpful comments if you can describe the frequency at which the feedback occurs.

bonaventura · #5 08-14-2009, 01:44 AM

Quote:

Originally Posted by johnz

...saying that the that the clarus "tolerates" a minimum impedance of 2 ohms rather than saying it "requires" 2 ohms would avoid potential confusion....

Ooops! brainfart! yes, tolerates. We must tolerate, not require, lest confusion ensue.

S.fasciani · #6 08-14-2009, 04:19 AM

Yeah I am using a realist pickup and that might be the problem with feedback I guess. It sounds great at low levels but past a certain point its real hard to control.
at a gig the other night the "sound guy" said he thought it was because of the impedance difference was too big.
another thing is when I turn the Tweeter off the distorted sound goes away.....

**Francois Blais** · #7 08-14-2009, 10:43 AM

Quote:

Originally Posted by S.fasciani

another thing is when I turn the Tweeter off the distorted sound goes away.....

Then maybe it's the cab that's defective ?
Can you plug in another one to check out ?