Bi-Amping with Arcam Alpha 6 possible? - 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 20th February 2004, 10:18 PM   #1
diyAudio Member
 
Join Date: Feb 2004
Location: In the south (N-Br)
Question Bi-Amping with Arcam Alpha 6 possible?

Hi,
I have already Bi-wired my system (Arcam Alpha 6 + JM-Lab Profil 5B Speakers) for over a few years now, with succes.
I would like to improve the sound by buying a second Alpha 6 amp to create a Bi-amping system.
Does anybody know how this is done with The Alpha 6?
Thanks for your help.
Philip A.
  Reply With Quote
Old 21st February 2004, 11:03 AM   #2
lucpes is offline lucpes  Europe
diyAudio Member
 
Join Date: Dec 2003
Location: Iasi
Send a message via Yahoo to lucpes
There's no specific recipe for various amp/speaker combos. You should have searched on Google:

http://www.whathifi.com/newsMainTemp...ewssectionID=3

http://sound.westhost.com/bi-amp.htm
  Reply With Quote
Old 21st February 2004, 04:03 PM   #3
diyAudio Member
 
Bill Fitzpatrick's Avatar
 
Join Date: Jun 2001
Location: Eugene, OR
Does your bi-amping desire include an electronic crossover?
  Reply With Quote
Old 21st February 2004, 07:01 PM   #4
diyAudio Member
 
Join Date: Feb 2004
Location: In the south (N-Br)
Both the alpha 6's are identical integrated amplifiers without preout sockets.
I would like to know how to adjust the Alpha's so I can use them in an Bi-amp situation.
The integrated amp and the power amp must be connected together with a stereo pair of interconnect cables, pre-out on the integrated to pre-in on the power amp.
You then use one (intgrated) amplifier to drive the left and right treble (or high frequencies), and the other to power the left and right bass. In general terms, the integrated drives the treble, and the power amp the bass.
  Reply With Quote
Old 22nd February 2004, 01:55 AM   #5
diyAudio Member
 
Bill Fitzpatrick's Avatar
 
Join Date: Jun 2001
Location: Eugene, OR
Use a "Y" connector having 3 RCA males. One goes to pre-out and the others to the power amp ins.

If you do this though, the amp for the tweeters will be running without a load at the low frequencies and the amp for the woofers will be running without a load for the high frequencies. Your amps may not be happy about this.
  Reply With Quote
Old 22nd February 2004, 02:10 AM   #6
diyAudio Member
 
5th element's Avatar
 
Join Date: Oct 2002
Location: England
Ok but I think the basic problem here is that the 6's dont have either pre out or ins and Philip is asking how to either connect them because of this, or how to modify the amps so that they do!

Well the simplest approach is use the tape loop of the first amp and simply hook the outs to a line in on the second amp. Ofcourse this means you have to adjust both volume controls but appart from that this setup works well. Its also worth considering using one integrated for the left channel and one for the right. This way the stress on the power supply in the amps is equally split, giving each amp roughly the same thing to amplify. For instance one amp on two bass drivers is going to work harder then the one on the tweets so thus will stress the power supply more. So using one per chan means the bass amp would work less hard bu the tweets would work harder, but the overall effect should be better.

If you want to go down the route of modding the amp I dont think it would be particularly hard. I did this with an old musical fidelity A1 integrated. All you need to really do is locate where the preamp ends and the power amp starts, then simply run wires from these points to phonos on the chassis.

Another thought is Arcam themselves, if you dont want to get your hands dirty let them do it for you. They used to have a service that did the very thing you are after add preouts to the 6's to enable bi amps with 7's 8's 9's and ten power amps. If all they have is adding preouts then you could take the preouts into a line in on the second 6 then simply adjust the level of the second amp to your liking, then control the volume from the first amp.

Matt
__________________
What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz!
  Reply With Quote
Old 22nd February 2004, 03:02 AM   #7
diyAudio Member
 
Bill Fitzpatrick's Avatar
 
Join Date: Jun 2001
Location: Eugene, OR
Hmm. Seems that I misread about his have pre-out amp-in connections.

Anyway, I don't see that there is going to be anything gained. I don't believe that bi-wiring offers an improvement let alone bi-amping in this manner.

What's your take on running amps with only partial loads?
  Reply With Quote
Old 22nd February 2004, 04:20 AM   #8
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Quote:
Originally posted by Philip A.
Both the alpha 6's are identical integrated amplifiers without preout sockets.
I would like to know how to adjust the Alpha's so I can use them in an Bi-amp situation.
The integrated amp and the power amp must be connected together with a stereo pair of interconnect cables, pre-out on the integrated to pre-in on the power amp.
You then use one (intgrated) amplifier to drive the left and right treble (or high frequencies), and the other to power the left and right bass. In general terms, the integrated drives the treble, and the power amp the bass.
If the 1st sentence is correct the rest of it doesn't make sense...

You need to be able to get at the pre & power sections separately... so if this is an ingegrated without pre-out, power-in, then step one is to add them...

then if passive bi-amping (which will gain you a bit), using the pre in one you drive both the poweramps. With 2 power amps the same, you would use one to drive each speaker (ie L to drive the bass, R to drive the treble) -- this maximizes available power supply since the bass channel usually requires the most juice. In your case since the pre is using the same power supply (unless the Arcam has separate supplies for the pre & power) you might find that the pre sounds better if its amp is only driving the treble.

If active bi-amping (this is where the big improvements come), you drive an active XO with the pre, and the power-amps are driven by the XO. You need to remove the passive XOs in the speaker. To get it right you may need to emulate any EQ in the passiveXOs in the activeXOs.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 22nd February 2004, 10:44 AM   #9
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Another option is semi active operation.

Instead of using two similar power amplifiers you use a smaller
one for the treble, the gain needs to be adjusted to be equal
to the gain of the bass amplifier.

By adding a simple first order high pass filter, say at 500Hz,
this is how you can easily use a smaller amplifier for treble.
(For clipping reasons this is a good idea
even if the power amplifiers are the same)

The speakers passive crossovers are still used.

Adding a first order low pass to the bass amplifier well above
the c/o frequency doesn't gain much at all, so not worth doing.

The treble amplifier output needs to be tapped off the main
amplifiers power amplifier inputs.

sreten.
  Reply With Quote
Old 22nd February 2004, 04:42 PM   #10
diyAudio Member
 
5th element's Avatar
 
Join Date: Oct 2002
Location: England
I said exactly what plannet said?
__________________
What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz!
  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
Best arcam alpha 5 plus mod jutter Digital Source 2 25th January 2009 11:42 AM
Arcam Alpha Plus amc184 Digital Source 6 17th January 2008 06:01 PM
Arcam Alpha 7SE trwh Swap Meet 0 14th July 2004 10:27 AM
Arcam Alpha 8 ManUtd Digital Source 4 5th April 2004 02:23 PM
Arcam Alpha 5 + j baldam Digital Source 1 9th July 2003 10:20 PM


New To Site? Need Help?

All times are GMT. The time now is 09:15 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