High Efficiency Speaker Asylum

Need speakers that can rock with just one watt? You found da place.

Use this form to submit comments directly to the Asylum moderators for this forum. We're particularly interested in truly outstanding posts that might be added to our FAQs.
You may also use this form to provide feedback or to call attention to messages that may be in violation of our content rules.

You must login to use this feature.

Inmate Login

By default, logging in will set a session cookie that disappears when you close your browser. Clicking on the 'Remember my Moniker & Password' below will cause a permanent 'Login Cookie' to be set.

Moniker/Username: The Name that you picked or by default, your email. Forgot Moniker?	Examples "Rapper", "Bob W", "joe@aol.com".
Password:	Forgot Password?
	Remember my Moniker & Password ( What's this?)

If you don't have an Asylum Account, you can create one by clicking Here.

Our privacy policy can be reviewed by clicking Here.

Inmate Comments

From:
Your Email:
Subject:

Message Comments

Original Message

It's a signal-noise ratio issue

Posted by KCHANG on March 7, 2007 at 12:41:00:
Hi Russ,
I'd take the preamp out of the system, connect the signals from the CD player directly into the crossover, and use a volume attenuator oafter the crossover. Using a preamp to control the volume typically would attenuate the analog signals into the crossover quite a lot. When I was playing with some JBL speakers with horn-loaded mid and high, the noise from the analog active crossover was so high to be distracting. The problem was that the volume attenuator was placed before the crossover, and at a normal listening level it dropped the CD signals by 30dB or so. The tiny signals were then filtered by the analog crossover, which added its noise to the output signals. The signals and noise were then amplified together by the amp by 30dB or so. The noise problem was solved by feeding the CD player output to the crossover directly, and feeding the crossover output into the DVD-Multi inputs of a cheap receiver used to biamp the speakers.
Cheers,
Kurt