"Un-integrating" an integrated amp - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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
Reply
 
Thread Tools Search this Thread
Old 6th June 2004, 09:39 PM   #1
diyAudio Member
 
Join Date: Jul 2003
Location: Silicon Valley
Default "Un-integrating" an integrated amp

I posted this in another group, but I think I probably posted to the wrong group. [Mr. Moderator, please feel free to remove either this, or the one in the "electronics" group.]

Hello folks. I've been learning quite a lot over in the loudspeakers group. I think this is probably my first posting here. Naturally, it's because I'm looking for help. :-)

I am using a powered subwoofer and an external crossover (Richter Scale) with a Rotel RA-02 integrated amplifier. The amp has a preamp-out, but no main-in. So currently I'm running the subwoofer through the low-pass of the crossover, and running the mains fullrange.

Can anyone tell me how run the mains through the high- pass of the crossover? I've asked the place I bought the RA-02 from if I could get the schematics for it, but they were not keen on the idea.

I'm thinking there's probably a single place where the pre-amp feeds the main. I could clip those wires and run them to a couple of RCA females added to the back of the cabinet.

Stupid idea?
__________________
Davy Jones
  Reply With Quote
Old 6th June 2004, 09:55 PM   #2
HDTVman is offline HDTVman  United States
diyAudio Member
 
Join Date: Aug 2001
Location: Chicago area
Dave Jones, does the amp have a tape monitor loop? If so:

1. connect the tape out to the crossover input.

2. connect high out to tape in

3. low out to powered subwoofer input

Now by turning on and off the tape loop you can hear the difference between full range and high pass to you main speakers.

Later BZ
__________________
What ever makes the tunes flow
  Reply With Quote
Old 6th June 2004, 11:41 PM   #3
diyAudio Member
 
Join Date: Jul 2003
Location: Silicon Valley
Quote:
Originally posted by HDTVman
Dave Jones, does the amp have a tape monitor loop? If so:

1. connect the tape out to the crossover input.

2. connect high out to tape in

3. low out to powered subwoofer input

Now by turning on and off the tape loop you can hear the difference between full range and high pass to you main speakers.

Later BZ

I thought of doing that, but then the volume control knob on the amp won't turn the sub up and down will it?

[Added a minute later.] I tried it. As expected, the volume control has no effect on the sub. However, it does let me hear what it would sound like if I *could* hook it up properly.

[Added a few minutes later yet.] Hmmmm. I think I see what you are getting at. It's very hard to tell any difference at all. Maybe I don't need to muck with the amp after all.

But I would still like to have pre-out and main-in. I had an NAD integrated amp years ago that had that feature, and I thought it was nifty. It came with some little bridge connectors to run pre-out into main-in when you weren't using an external processor. Why aren't ALL integrated amps made that way, rather than virtually none?
__________________
Davy Jones
  Reply With Quote
Old 7th June 2004, 12:33 AM   #4
HDTVman is offline HDTVman  United States
diyAudio Member
 
Join Date: Aug 2001
Location: Chicago area
Your correct about the volume control. I'd get the schematic for the unit and see if I could find where the point is that the preamp output and the normal amp split up. Most likely just after the volume control. You could open up the circuit going to the power amp there and route the amps input to jacks on the back panel. Be sure to use caps to protect the amp input and be sure to provide a DC / grd. reference for the amp if it's DC coupled.

Of course this is at your own risk you know.

Later BZ
__________________
What ever makes the tunes flow
  Reply With Quote
Old 7th June 2004, 12:44 AM   #5
diyAudio Member
 
leadbelly's Avatar
 
Join Date: Dec 2002
Location: Calgary, Alberta
Default Re: "Un-integrating" an integrated amp

Quote:
Originally posted by Dave Jones
I'm thinking there's probably a single place where the pre-amp feeds the main. I could clip those wires and run them to a couple of RCA females added to the back of the cabinet.
Open it up and have a look. Most likely the preamp PCB and power amp PCB's are distinct and tracing the signal will be easy.
__________________
Aerodynamics are for people who can't build engines. Enzo Ferrari
  Reply With Quote
Old 22nd November 2005, 11:47 PM   #6
diyAudio Member
 
Join Date: Jul 2003
Location: Silicon Valley
Default Did it.

I obtained the technical manual from the US service reps for Rotel (twenty bucks post-paid), and did the mod. I appropriated the "Aux 2" input for the new main-in, so I didn't even have to drill any holes in the box. It was surprisingly easy. I posted on the Solid State bb offering to describe how to do it, but no one appears interested.
__________________
Davy Jones
  Reply With Quote

Reply


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
MENG Series "EL34B" Integrated Amplifier stevenscoffee Tubes / Valves 2 8th July 2008 07:10 AM
"Integrated" or "stand alone" RenegadeAmps Tubes / Valves 13 11th October 2006 08:05 PM
The first tube "integrated circuit" (1926) jackinnj Tubes / Valves 3 19th March 2005 02:34 PM
Need help with IC Based Amplifier "pop" problem (Integrated Component) Monolith Solid State 7 13th March 2003 03:01 PM


New To Site? Need Help?

All times are GMT. The time now is 09:34 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2