Home Speaker Asylum

General speaker questions for audio and home theater.

RE: ?

The subwoofer high level input is a high impedance input buffer, likely 10k ohms or greater. That's 3-4 orders of magnitude greater than a typical loudspeaker impedance, so the presence of the subwoofer connection is effectively "invisible" to both the amp and speaker.

Also, a typical speaker cable resistance is 0.01-0.1 ohms, which is 5-6 orders of magnitude less than the input impedance of the subwoofer. And the cable reactance is insignificant at very low frequencies. So the subwoofer response is far, far less affected by the cable impedance than the loudspeaker response.

Regarding back-EMF, on second thought I think you're right. I was thinking that since amplifier damping factor is usually highest at low frequencies, back-EMF wouldn't be as much of a problem. But I neglected to consider that loudspeaker resonances are typically strongest in the bass, and in a typical small two-way + sub combination the port resonance of the loudspeaker is going to be within the transition band of the sub's crossover.



This post is made possible by the generous support of people like you and our sponsors:
  Atma-Sphere Music Systems, Inc.  


Follow Ups Full Thread
Follow Ups

FAQ

Post a Message!

Forgot Password?
Moniker (Username):
Password (Optional):
  Remember my Moniker & Password  (What's this?)    Eat Me
E-Mail (Optional):
Subject:
Message:   (Posts are subject to Content Rules)
Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:  Automagically notify you when someone responds.