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Frugel-Horn Mk3 Builds & Build Questions
Frugel-Horn Mk3 Builds & Build Questions
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Old 9th January 2018, 05:13 PM   #1321
chrisb is offline chrisb
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Join Date: Aug 2002
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Kevin - not all drivers need corner reinforcement in FH3s - certainly it's been my experience that the Mark Audio and TangBand drivers tried to date don't. I have systems in two different rooms - the smallest of which is approx 320ft^2, and the upstairs a much larger open plan. While temporary experimentation has shown me that both would be plenty large enough for even the FHXL - were it not for furniture and WAF - I'm restricted to smaller footprint floor standers with direct forward & top mounted drivers. On the occasions I've played the FH3 & XLs at home they've been primarily been with Alpair 7.3 or 10s, and situated with the rear mouth at least 1ft from back wall, and approx 8ft apart in a 15ft wide room.

Modes are related to ratios of room dimensions, and while something like the FE126 in the FH3 won't rattle the china off the shelves, they will still excite standing waves. The trick in smaller rooms - particularly square ones - is that the physical bulk of treatment required to fully tame bass and other acoustic issues can aggressively impinge on the already constrained space.

In addition to a surfeit of professional and advanced DIYers' websites, formulas and project plans, there's some interesting reading to be found here:
DECWARE / Articles and Papers On Hi-Fi

DECWARE - Article about Setting up a Listening Room without Treatments

Colorful, sometimes grammatically torturous, I've always found Steve's scribblings entertaining and often enlightening.
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Old 9th January 2018, 06:13 PM   #1322
kwolff67 is offline kwolff67  United States
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Thanks, Chris. I will check that out directly. The actual room dimensions are 12ftx15ft but I realize that's almost as bad as square.

I figured from what I've read so far that the room would need a lot of treatment, like pretty much total coverage (floor to ceiling corners, HF absorbers in upper edges, and a cloud near the speakers and one over the listening area).
There's not much furniture (bed and computer desk) and no WAF, so I don't care too much about how much space it takes or how ugly it looks as long as I'm relatively sure I'm not fighting a losing battle. I'm not building a studio nor am I looking for the perfect soundstage, but I'd like to get as close as realistically possible.

I have the fe126en's right now but am going to move to the A7.3 by spring (also if you could PM me the price for the supra-baffles you said you still have along with shipping to US 07083, it turns out I'm not as keen as I was on making my own).

Thanks for your help.
Kevin
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Old 9th January 2018, 08:06 PM   #1323
chrisb is offline chrisb
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Kevin - contact Dave by private email with any commercial queries.
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Old 16th May 2018, 08:37 AM   #1324
dimanov is offline dimanov  Germany
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Hi everybody,

I am just about to start building my pair with MA 7.3 drivers. I have a 15mm birch plywood (11 layers). When i rebate approx. 9-10mm I will end up with 5-6mm. Is this enough to support the drivers or maybe I can glue extra 4mm wooden ring inside (behind the driver)?

Thanks for the help,
Philip
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Old 16th May 2018, 05:07 PM   #1325
chrisb is offline chrisb
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Philip - I've built dozens of pairs of flat pack kits for that exact driver using 15mm BB, and if you use the (excellent) supplied screws and carefully pre-tap the pilot holes, I think you've got nothing to worry about. As I've said before, this ain't the cylinder head of a Cummins diesel engine you're torquing down.

Don't forget to chamfer the rear side of driver opening, and scallop around the location of the 4 mounting screws
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Old 16th May 2018, 05:17 PM   #1326
dimanov is offline dimanov  Germany
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Thanks, Chris.

I am still not sure how to chamfer (what tool to use) the rear side. For the rebating I am planning to buy this tool maybe it can help also for the chamfering...I just need to buy the right head and to be precise.
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Old 16th May 2018, 06:50 PM   #1327
chrisb is offline chrisb
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Small trim router and something like this would be sufficient for the amount of material that'd need to be removed

Click the image to open in full size.
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Old 16th May 2018, 07:11 PM   #1328
planet10 is offline planet10  Canada
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Frugel-Horn Mk3 Builds & Build Questions
Quote:
Originally Posted by chrisb View Post
… and if you use the (excellent) supplied screws...
Can’t be said too often…

Do not overtighten the screws. They should only be tight enuff so as to just hold a real or imaginary washer from turning.

dave
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Old 16th May 2018, 07:22 PM   #1329
dimanov is offline dimanov  Germany
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Thanks Dave,

I will follow all your advises and hopefully after a week I will share with you what I have done.
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Old 16th May 2018, 09:22 PM   #1330
chrisb is offline chrisb
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I'm still finding it easier to imagine that last guitar solo than that washer
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