Driver replacement suggestions for FH mk3 - diyAudio
Go Back   Home > Forums > Commercial Sector > Vendor Forums > Planet 10 hifi

Planet 10 hifi Home of the Frugal-phile™ - Planet 10 HiFi

Reply
 
Thread Tools Search this Thread
Old 5th February 2015, 08:20 PM   #1
Rabco is offline Rabco  United States
diyAudio Member
 
Join Date: Jun 2013
Location: Bloomington, IN
Default Driver replacement suggestions for FH mk3

Apologies if this topic in one form or another repeatedly rears it's ugly head....I'm just unsure of the current availability of the various potential solution brands, and their fitment.

I would like to try a different driver than the Fostex 125wKeN I currently use in my FH mk3.

I'm using a 4 watt OTL amp to drive the speakers, so sensitivity/efficiency is a consideration.

It would be ideal if a replacement driver would be "plug and play" and fit the existing driver opening shape and size of the cabinet without the use of a spacer, or requiring extensive modification.

I don't ask for much, do I?

It's time for me to consider an incremental change in my rig. I love my FH's, and thought it might be fun to "hot rod" them a bit.
  Reply With Quote
Old 5th February 2015, 09:41 PM   #2
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
If you have rebated the baffle, the only drop in would be FE126 (or FE127 if you could find them). The FE126 is some 3dB+ more efficient than the FF125 which helos if you are running out of juice. What you pay for the greater sensitivity is less bass capability, that is partially counteracted by less (or none) stuffing in the front below the driver. The FE126 is also the driver that really benefits from corner loading.

If you are willing to change the driver rebate, the Alpair 7x could be retrofitted transparently (ie new rebate is larger and deeper than that for the FF125*), but even the more efficient a paper version is less so than the FF125.

If your OTL is typical -- more power with higher impedance -- then a 16 ohm driver would be beneficial on that front. I know of none.

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 5th February 2015, 11:34 PM   #3
Rabco is offline Rabco  United States
diyAudio Member
 
Join Date: Jun 2013
Location: Bloomington, IN
Default Drive replacement suggestions for FH mk3

Thanks for the info, Dave.

If I was to go with Alpair 7, would routing be the best way to achieve the driver rebate change?
  Reply With Quote
Old 5th February 2015, 11:47 PM   #4
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 Rabco View Post
If I was to go with Alpair 7, would routing be the best way to achieve the driver rebate change?
That or cutting a big hole ad adding a supraBaffle (after the fact routing can be an issue). The latter a solution if you try the 1st and it messes up.

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 6th February 2015, 12:12 AM   #5
Rabco is offline Rabco  United States
diyAudio Member
 
Join Date: Jun 2013
Location: Bloomington, IN
Default Driver replacement suggestions for FH mk3

Are the SupraBaffles I would need the removable ones on the P-10 price list?
  Reply With Quote
Old 6th February 2015, 12:20 AM   #6
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
They could be done like that (those are as shown in the plan-set), but there are lots of ways it could be done.

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 6th February 2015, 06:53 PM   #7
chrisb is offline chrisb  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
The P10 SB kit was designed to be used with a mating front baffle with a large rectangular opening, and attached with machine screws to threaded inserts.

If you don't need to frequently remove / swap drivers of different sizes, enlarging the existing driver cut-out- to, say a 5x7" rectangle, and fabricating a new driver plate to suitably cover that opening should work just fine.

The attached sketch shows how we implement it - our optional SB plates are approx 1 1/2" wider than the enclosure, with beveled edges and small "cheeks" that wrap around the sides, but you could easily them the same width.


It won't be a particularly mess free operation.


As Dave notes, the only driver that'd drop in to rebated Fostex pincushion frame pattern would be the 126 - and as much as I generally prefer the A7 family, with your available power, the Alpair's lower net sensitivity could be an issue. No doubt there are lots of folks running A7s with flea watt amps - Dave has my pair of ACA Class A units on hand, but I've not had opportunity to hear them driving anything in his room - there's no assurance that'd be enough for you.
Attached Files
File Type: pdf FH SB.pdf (28.8 KB, 26 views)
__________________
"Perception is a highly non-linear function" - Earl Geddes

Last edited by chrisb; 6th February 2015 at 07:03 PM.
  Reply With Quote
Old 7th February 2015, 12:41 AM   #8
Rabco is offline Rabco  United States
diyAudio Member
 
Join Date: Jun 2013
Location: Bloomington, IN
Thanks Chris. All your info helps me make my next move.

Think I'll check in with the designer and ask for an opinion regarding the
load to the amp...must admit the Mini Beast doesn't seem to be working very hard driving the efficient 125wKeN's.

I'll reference the sensitivity specs on the Alpairs.

The file is great and may come in very handy. I stashed a copy.

I seem to tweak my system every couple years. I can feel the next mod getting closer.
  Reply With Quote
Old 6th June 2015, 09:18 AM   #9
diyAudio Member
 
Join Date: Aug 2010
While we're on the subject (and sorry to hijack your thread, Rabco) can you, Dave or ChrisB, give a simple breakdown of the advantages/disadvantages of the various Alpair 7x models?

I am on a tight budget and looking at some hefty shipping costs, so I want to make the most of the drivers I get. As an example, the cheapest shipping for 2x 7Ps is USD120 to my place. So, the difference of $20-30 in a driver is less of an issue - if the most expensive is the 'best', then I may as well buy them as the shipping is going to outweigh the cost of the driver in any event.
  Reply With Quote
Old 6th June 2015, 06:22 PM   #10
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
I would choose the metal cone driver. My opinion.

The paper is more efficient, but more forward, somewhat more like a Fostex FE driver. They are particularily hard until they have had massive break-in (1000 + hrs).

Some people love them. Having an SE tube amp will be the best match for them.

If you have heard A10.3 vrs A10p or A6.2m vrs A6.2p the difference between metal & paper are similar. The difference between A7.3 and A7p is not at all the same. The A7p better fits the stereotype of a metal cone driver, the metal cone that of a paper driver.

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

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
Peavey FH-2 FH2 FH1 FH-1 Folded Horn info X-Ray plans please! Peavey MB1 MB-2 Multi-Way 1 31st December 2013 12:40 AM
Frugel Horn mk3 driver options? thebiglebowski13 Full Range 3 21st November 2013 12:18 AM
New driver stage for dynaco mk3 gabdx Tubes / Valves 14 23rd February 2013 03:28 AM
Fostex Fe126en vs Aplair 7 in FH MK3 croweproductions Full Range 2 2nd January 2012 01:58 AM
Dalesford Bass Driver - Any suggestions for a replacement? MCH786 Multi-Way 2 1st January 2007 03:25 PM


New To Site? Need Help?

All times are GMT. The time now is 02:48 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright 1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2