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Old 23rd February 2013, 06:29 PM   #21
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Thanks guys, I'll devote some to time to get my head around the suggestions and come up with a plan (I'm fried atm from writing a 4000 word'er on nursing leadship...)

Have you a link to the stealth woofer thread/page please Dave?
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Old 23rd February 2013, 06:30 PM   #22
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Quote:
Originally Posted by Scottmoose View Post
You'd be better off with one of the 4in MA drivers (which were the ~'default' units FH3 was designed for), or an equivalent TB.
Grab yourself a set of the CHP70.1 from remo.nl before they are all gone.

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Old 23rd February 2013, 06:43 PM   #23
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Quote:
Originally Posted by mudchute View Post
Have you a link to the stealth woofer thread/page please Dave?
No thread, just pictures (and not a very comprehensive set)

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

dave
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Old 23rd February 2013, 08:46 PM   #24
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Any plans anywhere for those?
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Old 23rd February 2013, 08:56 PM   #25
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Since required size & detail will change depending on woofer(s) you choose, there is only a simple receipe.

Make a right angled triangular prism the height of the FH3 and as deep as needed to get the required volume. Mount the driver(s) on the back side (hypotenuse) near the floor.

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Old 23rd February 2013, 09:14 PM   #26
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Ah, I gotcha! Any suggestions for driver and plate amp?
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Old 23rd February 2013, 09:25 PM   #27
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We have been using woofs & plateamps that are mow unobtainium and have not explord further yet.

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Old 24th February 2013, 08:02 PM   #28
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depending on your selected woofer and the resultant enclosure dimensions, the aforementioned hypotenuse may not be sufficient to accommodate many of the current plate amps, and I'd prefer to avoid putting the amp in the same enclosure anyway

you'll note the terminals immediately under the driver - "we" generally suffer no shortage of power amps to power woofers - one very nice budget candidate that I think we've tried is the Dayton APA150

Dayton Audio APA150 150W Power Amplifier 300-812


for more power and elaborate controls, including line level HP output, there's the SA1000
Dayton Audio SA1000 Subwoofer Amplifier Rack Mountable 300-811
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Old 24th February 2013, 10:33 PM   #29
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I'd say there are two options here.

You could try to stay with one driver per side, and hope you'll get the bass you want from them. You'd get to keep your FH3 cabinets, and (with the MA drivers or maybe one of the new Fostexes) there's a fair chance it'll be better.

Alternatively, you could introduce more drivers and amplifiers.
This would involve new (potentially smaller) cabinets, and improved performance.
For example, the speakers I'm using at the moment have a Fostex FE126 (fully treated) and a 6.5" Tang Band mini-sub per side.
Bass goes down to 40Hz nicely, and cabinet volume is around 14L.
I took the sledgehammer approach to the difference in driver inefficiencies: the TBs have ~120w/ch to play with, the Fostexes around 10w/ch.
You can really crank this set-up, even in big rooms. Cone excursion on the woofers can get really silly, but the midrange/treble range (because the Fostexes are covering that) stays clean. IMO, this is where single-driver systems fall over - you can't ask a single cone to swing around at 40Hz while reproducing the rest of the range cleanly.
The above uses a 500Hz crossover. This is to automatically add BSC as well as relieve the Fostex of LF duties.

A third option would be a single subwoofer and plate-amp. You could hide this in the room, while re-inforcing the LF. That'd improve system performance, without having to rebuild the cabinets for the Fostexes.


I'd say it depends on your music tastes and how loud you like to listen. Many people would get away with the FH3s and be happy. I like something with more oomph.

Chris

Last edited by chris661; 24th February 2013 at 10:39 PM.
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Old 25th February 2013, 10:45 AM   #30
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Thank you all for taking the time to comment

I'm going to replace my drivers first with some Alpair 7's. Thanks to uni I'm not going to get this amplifier done anytime soon and I want to enjoy my music between now and then so I thought this the first step.

I'll get the amp done asap also and see how things sound after that. Failing that, I'll look at some LF assistance.

I'm unsure about the magnet wire. My house has to be bengal cat proof and they like to eat, errrr anything ad this might be a hazard to them plus it'll constantly neeed repairing I think. I'll have a think about that.
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