Howard's FF85wKeN - Page 2 - 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 18th September 2013, 12:52 PM   #11
xrk971 is offline xrk971  United States
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Virginia
Quote:
What surprises me is that DIY'ers are not all over it like a rash.
They have been all over it. Dr Boar did a full on study and I think Chazdrumsalot also built one. I think IG81 made a nice BLH for the FF85wk - very tall thin and deep box as I recall.
  Reply With Quote
Old 18th September 2013, 03:26 PM   #12
diyAudio Member
 
Scottmoose's Avatar
 
Join Date: Mar 2005
Location: UK
+1. It's quite a popular article AFAIK, with several builds having been done that I know of. Solid box, like you'd expect from Martin, and using a Helmholtz in a back-horn can work well providing the initial upper roll-off is sufficiently steep.

None of which alters the fact that the FF85wk is not a bass driver & really doesn't thank you for trying to get much from it. Horn loading helps, but these things are relative. As in some parts of the Titanic are less underwater than others, relatively speaking.
  Reply With Quote
Old 18th September 2013, 03:57 PM   #13
howardg is offline howardg  United States
diyAudio Member
 
Join Date: Mar 2007
Yes Scottmoose, I do get your point.

Quote:
The FF85wk does not do bass. You can force it to produce some. You can force a lot of tiny drivers to produce some. You will pay, as Dave says, a very heavy price for it in rocketing harmonic distortion. Just because it's possible to get LF from a tiny driver with a high Fo & miniscule linear travel does not make it a good idea. If you were planning on crossing to a driver designed to produce LF, do so. You'll get far better results.
Yeah that was actually my plan for these. Originally using the 8" Silver Flute in the suggested 15 liter box, F3 of 60hz. But now thinking that the 6.5" Silver Flute in that box will likely give me an F3 of about 40 hz, may sound less constricted and will have plenty of power handling when compared with the ff85wk. The Silver Flutes are a bargain here in the USA. Also been getting intrigued by the idea of using a TL cabinet and getting really low bass, but in a much bigger package.

I did use a fe126e from 500-5000hz, and mounted it in a classic stuffed T line sub enclosure with a closed terminus. The mids are really nice. Way more neutral sounding than I would have expected.


I do think that I will make an MLTL for a 6.5" SF for an in wall sub, where I have already installed my FE166e folded in-wall horns(flat to 100hz)


Also seems like a super tweeter crossed high might be a great way to go with a nice full range and helper woofer. These would end up being 3 ways with no x over in the critical region. The lower x over would be kinda pricey perhaps.
  Reply With Quote
Old 18th September 2013, 04:05 PM   #14
xrk971 is offline xrk971  United States
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Virginia
Quote:
The lower x over would be kinda pricey perhaps.
Go with passive line level XO and bi-amping - cheaper and more power delivered than big coils and caps given low price of nice class D amps.
  Reply With Quote
Old 18th September 2013, 04:47 PM   #15
chrisb is offline chrisb  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
Quote:
Originally Posted by xrk971 View Post
Go with passive line level XO and bi-amping - cheaper and more power delivered than big coils and caps given low price of nice class D amps.

gee, that sounds like something chris would say
__________________
you don't really believe everything you think, do you?
community sites t-linespeakers.org, frugal-horn.com commercial site planet10-HiFi
  Reply With Quote
Old 18th September 2013, 04:53 PM   #16
diyAudio Member
 
Scottmoose's Avatar
 
Join Date: Mar 2005
Location: UK
Surely not.
  Reply With Quote
Old 18th September 2013, 05:17 PM   #17
chrisb is offline chrisb  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
First, I'd like to acknowledge that it was Terry Cain who first pointed the 85K out to us several years back - he even had a pint size version of the Abby enclosure for these. With so many drivers to chose from, it's hard to know which ones to gamble on.

Both the 85k , and even more so the new WK, work very well in concert with 6-8" midbass drivers with smooth extension into the 2-3 K range - rather than "sub" drivers that often exhibit nasty peaks before taking their final dive. We've use the little Fostex in at least 3 different combos over the past 5 yrs or so, as well as solo in the "micro" Fonken. In all of the "FAST" systems the Fostex was in a tapered / nearly aperiodic TL.

Howard, you may remember seeing/hearing the faceted enclosures at Dave's place in August. This was 85WK in a tapered MLTL(?), passive LLXO at 240Hz, to 2 opposing pairs per enclosure of Peerless 830870 midbass. I've been test driving those over the past few weekends, and it's quite amazing how much LF energy 4 of those little Peerless per side can deliver - within sane limits - at least enough in my room to rattle some of the loose ornaments. No doubt a much simpler configuration would work quite well for the bottom.


Click the image to open in full size.

You may also remember the MTM "Fonkenesque" with 6" Silver Flutes and 85WK - series passive XO - another great sounding combo.

Click the image to open in full size.


These little buggers (85s) punch way above their weight class when relieved of any of the heavy lifting below around 200 or so.
__________________
you don't really believe everything you think, do you?
community sites t-linespeakers.org, frugal-horn.com commercial site planet10-HiFi
  Reply With Quote
Old 19th September 2013, 12:09 AM   #18
howardg is offline howardg  United States
diyAudio Member
 
Join Date: Mar 2007
Quote:
You may also remember the MTM "Fonkenesque" with 6" Silver Flutes and 85WK - series passive XO - another great sounding combo.
Yes, I definitely do. Those were the pair that encouraged me to use the 85wk with the Silver Flute, which at that time I assumed would be an 8". Not sure why Madisound suggests the smaller sized cabinets for these. Take the 6.5" for instance: DaveR said that his 3 way that uses the 6.5 and has about 17 liters ends up with a F3 of about 38hz(this was in casual conversation, so I won't hold him to it). The recommended 12 liter cabinet yields an F3 of 60 hz with the same driver.

I am liking the vintage walnut cabinets a lot (like my solo 103's that came to the FEST). I am planning to use another RS cab, from aN mc-1000, which is about 16 liters empty, for the above mentioned build.
  Reply With Quote
Old 19th September 2013, 12:20 AM   #19
howardg is offline howardg  United States
diyAudio Member
 
Join Date: Mar 2007
Quote:
Go with passive line level XO and bi-amping - cheaper and more power delivered than big coils and caps given low price of nice class D amps.
xrk971,

I have been thinking along similar lines. tuxedocivic was at DIYFEST with a minidsp that had 4 on-board amp channels and a computer programmable active crossover that retains it's settings when detached from the computer. Can easily hold it in one hand and it sounded great to my quick-listen on unfamiliar speakers.
  Reply With Quote
Old 19th September 2013, 12:23 AM   #20
howardg is offline howardg  United States
diyAudio Member
 
Join Date: Mar 2007
Hi Chris,

Quote:
In all of the "FAST" systems the Fostex was in a tapered / nearly aperiodic TL.
What does FAST stand for?
  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
Help/advice needed - Howard S2 midbass Blew kirby299 Multi-Way 4 9th January 2013 06:33 PM


New To Site? Need Help?

All times are GMT. The time now is 06:16 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