rolling of bass before amp - diyAudio
Go Back   Home > Forums > Source & Line > Analog Line Level
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 10th January 2011, 11:28 AM   #1
diyAudio Member
Join Date: Jul 2002
Location: arizona
Default rolling of bass before amp

I've decided after blowing up one of my Accuton C95's

Accuton v.s. Reference Recordings | Flickr - Photo Sharing!

that I'd like to be a little more "pro-active" about preventing my next visit from the broken eggshell fairy. My heavily modified dvd player has two outputs. One for the mains amp, and one for the subs. I haven't been using the both of them, instead running the subs using the high level inputs because of the "supposed" better integration it offers (thus spake Rel and Genesis) and fewer wires (the subs sit under the mains.) I'm using a 1.5 uf Mundorf as a coupling cap on the output of the dvd player. What I'd like to do is roll off the output to the main amp so that it's not running full range. (such a waste of a beast of an amp: Pass X250.5) I know it wouldn't take much to just run a smaller cap and roll it off earlier, but I don't think that would be steep enough.

Here's my question: Can I run a (very small) cap and coil (or even cap/coil/cap) like I would in a speaker crossover to get a steeper rolloff? And yes, I'm opposed to running an electronic crossover. More complexity (I'm running one interconnect and a pair of speaker cables) and not thrilled with running the signal through all that additional signal processing.

Thanks in advance for any tips you might have.

  Reply With Quote
Old 11th January 2011, 10:16 AM   #2
diyAudio Member
Join Date: Jul 2002
Location: arizona
Am I not posting this in the right forum?
  Reply With Quote
Old 11th January 2011, 10:27 AM   #3
SY is offline SY  United States
diyAudio Moderator
SY's Avatar
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 2
Why not put the cap at the input of the amp? Smaller, cheaper, and better performance.

edit: OK, I see what you're asking a bit better. I suspect the single order rolloff would be sufficient. If you want a second order rolloff, the inductor will have to be pretty large- a gyrator would be perfect in that spot. Cost you an opamp and a few parts.
"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
  Reply With Quote
Old 11th January 2011, 07:06 PM   #4
diyAudio Member
BobEllis's Avatar
Join Date: Sep 2003
Location: Upstate NY
See | Passive Line-Level Crossover - you can make a 2nd order filter with CRCR. You can go higher order if you need at the potential expense of signal level. You'll probably need to adjust the subwoofer drive level.
  Reply With Quote
Old 12th January 2011, 01:37 PM   #5
diyAudio Member
Join Date: Jul 2002
Location: arizona
Thanks Bob! This looks like exactly what I need!

Now I need to brush up on my math. (And to think it was my best subject - besides music - in school.)
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Help! Tube Rolling davethomp Tubes / Valves 2 3rd February 2010 04:29 AM
Drivers rolling off too soon - why? Tyson Multi-Way 9 18th January 2010 08:25 PM
Anyone rolling their own horns? DrewP Multi-Way 4 27th January 2002 07:55 PM
Rolling your own inductors... JoeBob Multi-Way 2 13th December 2001 04:28 AM

New To Site? Need Help?

All times are GMT. The time now is 11:23 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2