Frugel-Horn Mk3 Builds & Build Questions - Page 72 - diyAudio
Go Back   Home > Forums > Loudspeakers > Full Range

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 12th October 2012, 08:21 PM   #711
Speakerholic
diyAudio Moderator
 
Cal Weldon's Avatar
 
Join Date: Jan 2004
Location: Near Vancouver
Quote:
Originally Posted by chrisb View Post
I understand that a lot of guys like to use the high level inputs on plate amps to maintain the "sonic signature" of the amp
Nope, never even considered that, it's so you can make use of the high level outs on the plate amp, reducing the length and clutter of the wires.
Quote:
but doing so negates the overall advantages to be gain by High Passing the mains
Do you mean because the high level out on the plate amp is a fixed, single cap often around 100-150 fd?
Quote:
Personally I'd use the line level inputs
But that leaves the high levels outs dry as a Victoria creek bed this summer.
__________________
Next stop: Margaritaville
Some of Cal's stuff | Cal Weldon Consulting
  Reply With Quote
Old 13th October 2012, 10:29 AM   #712
diyAudio Member
 
Join Date: Nov 2009
Location: Home of The Fighting Gamecocks
When driving the horns with a SET and using an AVR to power some Eminence Alpha woofers I've found this to be an inexpensive option to filter out the high frequencies.

80 Hz Low Pass 8 Ohm Crossover 266-442

It works as well for me as dual Dayton APA150 amps with built in crossovers.
  Reply With Quote
Old 26th October 2012, 05:40 PM   #713
Adam0 is offline Adam0  Belgium
diyAudio Member
 
Join Date: Aug 2012
Default To damp or not to damp - that is the question!

I am sorry if this seems a bit basic. I have recently built a pair of FHMK3's using 18mm, high quality birch ply. The drivers are Mark Audio Alpair 7 Gen 3 (with extra magnet attached.)

I have used 0.5 inch cotton damping to the upper walls as described but I am struggling with damping. I am looking for the maximum lower base without screwing up the lovely smoot midrange (I hate a boxy sound).

So my question is, firstly how do you describe the audible difference with heavy damping and no damping (excluding the cotton felt upper lining as described) I ask this because Lowther insist that their cabinets are not damped at all and I wonder if they could sound any good?

It appears to me that the lower bass is a little extended without damping but according to theory, it should be reduced? What effect can damping have on the lower mid range (bottom of the female human voice - for example)?
  Reply With Quote
Old 26th October 2012, 06:44 PM   #714
chrisb is offline chrisb  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
The FH3 design plans call for all drivers to use damping in the "apex" of the horn ( i.e. section behind the internal divider panel - if the horn was not folded it would easier to see that it's above the driver). Hopefully that was in place before assembly - it's pretty hard to access once buttoned up.

Damping below the driver is system (amp & room placement) dependent, and the conundrum can be that the quantity is a bit of a guess until drivers are fully broken in - and once again, access is rather tight. The two most brilliant solutions I've seen to that are building with removable top panel, and installation of light mesh netting approx 2/3 down the lower expansion to retain fiber in place.

I've built so many of these that I honestly forget if one has been with the A7s and how much fill we might have used. Without some, I'd imagine most of the MA drivers could be a bit "chesty" - not necessarily a bad thing with some vocalists , (hmm, Sade) but I digress.
__________________
now on sabbatical
  Reply With Quote
Old 26th October 2012, 07:29 PM   #715
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 chrisb View Post
I've built so many of these that I honestly forget if one has been with the A7s and how much fill we might have used. Without some, I'd imagine most of the MA drivers could be a bit "chesty"
Chris, the original mules has A7 in them for awhile. Without any damping below the driver (and 3 ft out from the wall), the mid/upper bass was big, round, tuneful but too much quantity (some might like this) -- FH3 doesn't cover the low bass.

The FH3 with suprabaffle will be the 1st set you have built dedicated to A7/EL70.

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 26th October 2012, 07:38 PM   #716
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 Adam0 View Post
I am looking for the maximum lower base without screwing up the lovely smoot midrange (I hate a boxy sound).
The FH3 does not go low enuff to have lower bass (defined as 20-40 hz). To cover that you will need some woofer support. With even a modest high pass on the FH3 as well, with the removal of it trying to reproduce the lowest notes, the whole system will be able to play louder.

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 26th October 2012, 10:39 PM   #717
Adam0 is offline Adam0  Belgium
diyAudio Member
 
Join Date: Aug 2012
Excellent feedback thanks! Any suggestions for a sub-woofer system? Plate amp with built in high pass filter like that of the Detonation Dt150 perhaps?
  Reply With Quote
Old 2nd November 2012, 03:19 PM   #718
tlarwa is offline tlarwa  United States
diyAudio Member
 
Join Date: Jan 2008
Default Chamfered edge on back of driver cutout

So I made a minor boo boo ... I glued the baffles in place before I chamfered the back edge of the drive cutout. How critical is it that this is chamfered? I'm using the CHP70 drivers if it matters. And if I do need to chamfer the holes, and suggestions on how to best do it at is point? I'm attaching a pic to show the stage they're at right now. Thanks for the help!
Attached Images
File Type: jpg image.jpg (670.8 KB, 331 views)
  Reply With Quote
Old 2nd November 2012, 04:28 PM   #719
diyAudio Member
 
Join Date: Jan 2007
Just use a rasp to get the same effect. It will take just several minutes per hole to do a really good job (considering it's plywood). It is challenging to rasp the part near the side panel (not much clearance), but that doesn't matter as long as you rasp out everything you can (while still leaving enough for the screws -- but the screws don't need much in my experience).

(Plenty of commercial designs don't chamfer / rasp at all, so whatever you do puts you way ahead.)
  Reply With Quote
Old 2nd November 2012, 05:39 PM   #720
chrisb is offline chrisb  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
It also appears that the cutouts weren't rebated for flush mounting - whatever your opinion might be as to the effects of that, on drivers as shallow overall and with as thick a mounting flange as all of the MA, it will further emphasizes the constriction immediately behind the cone.

mr Bond is correct about many commercial products not being chamfered, but they're also more likely to be CNC machined with rebates, and many OEM drivers have much thinner mounting flanges
__________________
now on sabbatical
  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
Frugel-Horn Mk3 planet10 Full Range 1371 Today 10:12 AM
Frugel-Horn Mk3 flat-paks planet10 Planet 10 hifi 462 3rd July 2014 01:56 AM
Frugel-Horn Mk3 Auditions planet10 Full Range 24 8th June 2012 08:18 PM
"straight" frugel horn mk3 mahleriana Full Range 10 15th April 2011 02:28 AM
My Frugel-Horn Build italynstylion Full Range 130 22nd June 2010 01:24 AM


New To Site? Need Help?

All times are GMT. The time now is 10:22 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