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RE: Smoked Ribbon

Posted by Cory M. (A) on July 4, 2015 at 11:30:55

In Reply to: Smoked a 3.5R Ribbon? posted by HiOnFi on July 3, 2015 at 09:20:23:

Edit: I read through your post again, but I still must be missing something. You're using the Swan's woofers on one amp, and the Maggie ribbons on another amp, using the original passive, speaker level crossovers? Are you running two pre-outs from the P5, with bass management for the treble section?

You're supposed to be seeing smoke from the fireworks, not your stereo. ;-)

It really sounds as if you have DC flowing through the ribbon in that channel. If so, I would suspect the ribbon's power amplifier. The culprit could likely be a leaky coupling capacitor, or the amp may just need some adjusting.

A way to check this would be hooking up a DMM to the speaker outputs, and measuring the DC offset. Set the meter up in the mV range, or the lowest voltage setting it has. You should be getting less than 20 mV DC. In some amplifiers, you can actually adjust the offset with an internal pot.

I really wouldn't think that it would have anything to do with the XO, with one exception. It could be that the frequency range is set too low on the ribbon in that channel. Even if the knobs are properly positioned, I would still check to make sure that channel is not passing any low frequencies. This could be done by hooking a bass driver up to it. I'd think that the ribbon would go out quickly under those circumstances, however.

Some questions:

This is a preamp level active setup, correct?
Which active XO are you using?
Are you bi- or tri-amping?
Which amp is on the tweeter (/mid)? Tube or SS?
Do you hear any hum? (Likely not, if DC).

Cory

Edits: 07/04/15

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