Aleph 4 vs Aleph 2 for Driving slotted Open Baffle Bass Section - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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 5th February 2013, 07:20 PM   #1
diyAudio Member
 
vdi_nenna's Avatar
 
Join Date: Oct 2000
Location: PA, USA
Blog Entries: 1
Send a message via Yahoo to vdi_nenna
Default Aleph 4 vs Aleph 2 for Driving slotted Open Baffle Bass Section

I would like to drive the bass section of the Slotted Open Baffle loudspeaker with more authority. The six 8" drivers are 12 ohm and wired in series/parallel for around 12-16 Ohm. It's currently driven by a F5 with no thermistor and protection circuit.

If the drivers were wired in parallel, then series, for lower combined impedence, would there be more current to drive the speaks to a noticablely higher output? This would be the easiest option, obviously.

Another option would be to build an amp with more power. I have Aleph boards and could make either an Aleph 4 or 2. The voltage difference is 3v, 45v vs 48v, but one handles lower loads better. Is it the A2? They have the same number of output mosfets. Both are good for 100w at 8 ohms, I believe.

Like to hear your thoughts and experience.

Thanks,

Vince
__________________
I build, therefore I am.
  Reply With Quote
Old 5th February 2013, 07:27 PM   #2
PKI is offline PKI  United States
diyAudio Member
 
PKI's Avatar
 
Join Date: Aug 2011
why not F5Tv3(v2)?
  Reply With Quote
Old 5th February 2013, 07:28 PM   #3
biju55 is offline biju55  India
diyAudio Member
 
biju55's Avatar
 
Join Date: Jul 2011
Location: Kuwait and India
Send a message via Skype™ to biju55
Aleph 60 would be a better choice ...
  Reply With Quote
Old 5th February 2013, 08:17 PM   #4
diyAudio Member
 
vdi_nenna's Avatar
 
Join Date: Oct 2000
Location: PA, USA
Blog Entries: 1
Send a message via Yahoo to vdi_nenna
Quote:
why not F5Tv3(v2)?
I would if there were working boards available at a reasonable price.
Nothing in the store yet and the last quote I received for boards was very high.

I also have AX and AJX boards, but they are more complicated and would like to use them for the upper frequencies.


Quote:
Aleph 60 would be a better choice ...
The A60 is 60w into 8 ohm, and I don't have a schematic for it. Won't be hard to adjust for 60w. But, just looking for raw power. I'd try the A100 BJT, but it's BJT. If the output were high bias FETs, I'd try it.

Would be more apt to go for the F5T. Have F5 boards sitting around too.

Thanks.
__________________
I build, therefore I am.
  Reply With Quote
Old 5th February 2013, 08:24 PM   #5
PKI is offline PKI  United States
diyAudio Member
 
PKI's Avatar
 
Join Date: Aug 2011
Quote:
Originally Posted by vdi_nenna View Post
Nothing in the store yet and the last quote I received for boards was very high.
Thanks.
really?! that's sad :-(
Quote:
Originally Posted by vdi_nenna View Post
The A60 is 60w into 8 ohm, and I don't have a schematic for it.
Thanks.
There is my thread about the build, everything is there...
I am planing to make a F5Tv2 in next two weeks so can compare it with my Aleph 60...
  Reply With Quote
Old 5th February 2013, 08:32 PM   #6
diyAudio Member
 
MEGA_amp's Avatar
 
Join Date: Oct 2003
Location: CT
Aleph4 is basically lower biased Aleph2, made so it'll fit in a stereo chassis. Aleph2 is dual mono. Was just looking through the service manuals for the A2/A4, it states that the output stages for each are biased at 'slightly greater than 3 amps', but the A4 dissipates 250W/ch vs A2's 300W/ch. The 2 will do 160W/4ohms, there wasn't a spec for the A4 into 4ohms. I'd say go for 2, Nelson has stated somwhere on here that it's 'the most neutral of the bunch'. I built a Aleph5 biased @6A once, had plenty of grunt until it went up in smoke. You know the rules, big PS, big sinks, big bias..etc.

Last edited by MEGA_amp; 5th February 2013 at 08:35 PM.
  Reply With Quote
Old 5th February 2013, 08:44 PM   #7
diyAudio Member
 
vdi_nenna's Avatar
 
Join Date: Oct 2000
Location: PA, USA
Blog Entries: 1
Send a message via Yahoo to vdi_nenna
PKI- let us know how if comes out!

Mega-amp, thanks for the details
__________________
I build, therefore I am.
  Reply With Quote
Old 6th February 2013, 01:52 AM   #8
coils is offline coils  United States
diyAudio Member
 
Join Date: Jan 2004
Location: Los Angeles
I have open baffles also. The bass (8 ohm) has been driven from diy F3, and F5. With these amps, the bass has lacked "authority" (to use your terms).

I considered boxing and porting my OB's.

Until I drove the bass with an F5c. It made a noticeable difference, and I am looking forward to other higher power amps on bass duty. I like my OB's, and they are staying.

I'm now collecting parts for F5T V3, and have an SE Burning Amp in progress. It's a disease.
__________________
Coiler
  Reply With Quote
Old 6th February 2013, 01:46 PM   #9
diyAudio Member
 
vdi_nenna's Avatar
 
Join Date: Oct 2000
Location: PA, USA
Blog Entries: 1
Send a message via Yahoo to vdi_nenna
Thanks Coils. It's as much a disease as equipment rolling. Maybe worse.
__________________
I build, therefore I am.
  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
Open Baffle Bass kctess5 Multi-Way 21 10th February 2012 10:54 AM
My new Aleph ONO Phono Section Algar_emi Pass Labs 115 28th October 2008 11:33 AM
Aleph 4 driving Maggie 1.5 Q/R's DirkD Pass Labs 0 12th November 2004 01:15 PM
Aleph 5 for mid/treble and Aleph X for bass bbakota2000 Pass Labs 25 28th May 2004 07:05 PM
DRIVING Aleph 5 - quick question?? D3 Pass Labs 2 2nd December 2003 07:09 AM


New To Site? Need Help?

All times are GMT. The time now is 01:40 PM.


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