What amp to drive my Magnepan 1.6 - 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 25th August 2013, 01:05 PM   #1
Neville is offline Neville  United States
diyAudio Member
 
Join Date: Jul 2004
Location: Georgia
Default What amp to drive my Magnepan 1.6

These are 4 ohm planars that like a LOT of power to hear its full potential. I currently have them driven by a 600 watt per channel Class D amp and hotrod Mez DCB1 preamp. I also have a 250 watt per channel Class D amp that is warmer but does not control bass as much as the 600. So from what I can gather, Pass amps sound more powerful than what their spec. calls for. I have read that the F4 is a sweet sounding amp and from what I could piece together, the BA is more modular. But how do I get either to push out 100 watts per channel? I would like to house whatever solution in a single Deluxe 4U chassis from the the DIYAUDIO store and would like to keep costs down to a minimum.

I am new to amp building, can solder and follow instructions - I need advise as to what all I need to get to my target of 100 watts. Searching forums has not yielded any noob guides although 6L6 guides are great but for a beginner that wants to know how to piece it together, I came up short.

So to get it kicked off, I know a chassis with huge sinks is needed. A powerful transformer depending on pcb solution. PCB for either F4 or BA and if BA a gain stage pcb PLUS bias and output pcb. What about universal power supply available in the DIYAUDIO store? This should get me a build but from what I can tell F4 is only 25 watts per channel and I have no idea about BA - no specs are listed in the store. So how to get to my 100 watts?

So as you can see this is where I am struggling...

Thanks in advance
Neville
  Reply With Quote
Old 25th August 2013, 04:19 PM   #2
6L6 is offline 6L6  United States
diyAudio Member
 
6L6's Avatar
 
Join Date: Oct 2010
Location: Denver, Colorado
Quote:
Originally Posted by Neville View Post
So how to get to my 100 watts?
Contact member ' Zen Mod ' buy his "Pumpkin" preamp. Build it. This is a preamp that has sufficient gain and balanced voltage outputs to drive an F4 to max output.

Build (2) F4 amps. Run them as monoblocks, using the balanced output from the Pumpkin preamp. They are now running bridged, and each F4 will make 100W into 8ohm, more into 4ohm.

The only way you can get 100WPC from a 4U single chassis is to not build a class-A amp. Look at the 'Honeybadger ' It's quite nice. http://www.diyaudio.com/store/amplif...it-boards.html

The Burning amps are quite modular and can be anywhere from 20WPC to 50-ish. In a 4U chassis and stereo, you would be hard pressed to make more than 30WPC before you run out of heatsink, and that would be at lower than optimal bias.

Last edited by 6L6; 25th August 2013 at 04:23 PM.
  Reply With Quote
Old 25th August 2013, 05:18 PM   #3
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
4U or (better) 5U Modushop chassis will host bal F4 nicely , with biasing up to proper htsnk temperature ....... no need to go all the way up , making welder in A class

there is no Klunk!

however , having more than 3 mosfet pairs per side (or 3 pcs per quadrant) will help , counting on fact that each side will see some 2 ohms of load , while maintaining A class (prior to no Klunk! )

so - bstrd between classic F4 (balanced) and some BA3 OS iteration ....

just short conclusion - one (bal) "F4" per case .........
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 25th August 2013, 06:59 PM   #4
Neville is offline Neville  United States
diyAudio Member
 
Join Date: Jul 2004
Location: Georgia
Thanks for input.....when referring to balanced - I cannot help but think this is a term NOT related to the input connector but rather 2 monoblocks? And having said that the only way to get close to 100 watts is monoblocks?

Is the honeybadger as simple as the F4 or F5 build?

Last edited by Neville; 25th August 2013 at 07:01 PM.
  Reply With Quote
Old 25th August 2013, 07:20 PM   #5
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Quote:
Originally Posted by Neville View Post
Thanks for input.....when referring to balanced - I cannot help but think this is a term NOT related to the input connector but rather 2 monoblocks? And having said that the only way to get close to 100 watts is monoblocks?

.....
in this case - balanced means - two SE output stages bridged , thus balanced

if substantial A class portion of power is desired , then monoblocks are must - heatsinking demands ;

presuming you'll not go forced cooling (vent assisted heatsinking) route

if yes , Krell KSA50 as fine example of needed hardware

on other hand - take a look on PL XA30.5 ....... and read tech data ( so much things written between the lines ) :

https://passlabs.com/products/amplifiers/xa.5/xa30.5

Click the image to open in full size.
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 26th August 2013, 03:08 AM   #6
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
That will probably get you a couple hundred a channel into 4.....

  Reply With Quote
Old 26th August 2013, 02:06 PM   #7
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
nasty ampsesssss

__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 26th August 2013, 09:50 PM   #8
diyAudio Member
 
Join Date: Sep 2001
Location: Northern California
I was chatting with one of the Pass Labs dealers at CES-2012 who mentioned that he took a Pass INT-30a to a "show and tell" evening hosted by his local audio club.

This was at a club members home, Maggie 20.1's.

The little INT-30a apparently did something that most of the big amps couldn't to with the the Maggie's....together they filled the room with music...... and apparently it wasn't a little room by anyone's measure.

Just relaying a story, I've known the dealer for many years and he's always given me good advise.

Cyclotronguy
  Reply With Quote
Old 26th August 2013, 10:03 PM   #9
diyAudio Member
 
sakellogg's Avatar
 
Join Date: Nov 2008
Location: dixon ill
20.1's and a int-30a......

i would buy a ticket to that.
__________________
I'm not crazy, my mother had me tested
  Reply With Quote
Old 26th August 2013, 10:06 PM   #10
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
yup ; 30W/A class

panties off / AB class

ladies and gentlemen ........ Klunk! time !

__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  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
Magnepan High Frequency Tube Amp john65b Tubes / Valves 6 31st March 2011 02:54 PM
Magnepan, B&K 6 channel amp mathman Swap Meet 2 21st May 2007 12:29 AM
tube amp for magnepan 1.6 sunseeker Multi-Way 0 8th July 2005 08:43 PM
Magnepan 3.3 bi amp Chauvus Multi-Way 7 7th January 2003 02:03 AM
WTB Magnepan 3.3, FS Magnepan 2.6 guyv Swap Meet 1 9th May 2002 09:32 PM


New To Site? Need Help?

All times are GMT. The time now is 05:08 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