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Frugel-Horn Mk3 Builds & Build Questions
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Old 3rd February 2015, 06:30 AM   #1101
planet10 is online now planet10  Canada
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CHR has the same thick bezel.

dave
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Old 3rd February 2015, 06:32 AM   #1102
Zootalaws is offline Zootalaws  New Zealand
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Bugger!

If it's only the front baffle, that's not going to be an issue. I have a bit of spare 18mm floating about - not a whole sheet, just offcuts but at least a few 4" x 4' pieces.
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Old 3rd February 2015, 06:38 AM   #1103
zman01 is offline zman01  Bangladesh
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Zootalaws,

You need to convince your better half to approve of the Alpairs (Alp 7.3) - I am guessing that the speakers will be used for a long time - so the additional initial outlay is likely to be well worth it.

The FH3 play nicely with the CHR drivers, but the Alpairs take it up a level.

Your off-cut 18mm pieces should be large enough to fashion the front baffles from? Rest should be fine with 15mm ply.

Last edited by zman01; 3rd February 2015 at 06:41 AM.
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Old 3rd February 2015, 06:42 AM   #1104
Zootalaws is offline Zootalaws  New Zealand
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It's the timing...

We are saving to buy another property and I have a budget of $150/month for toys.

I can't, in all honesty, go above that. To do so would be going back on our planning and agreements.

As it stands with current planning, we can deposit in 12 months, freehold in 5 years, so it's worth the sacrifice.

I will probably get some Alpairs later on, and repurpose the CHRs to a bookshelf or something.
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Old 3rd February 2015, 06:55 PM   #1105
chrisb is offline chrisb
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Another trick that's frequently used is to laminate an extra layer of material to the upper section of the baffle on which the driver is installed. In the case of using the A7.3, which as Zia notes is not just a "little better" than the CHR70.3, the total thickness required in that section of the baffle is at least 18mm if not using the extra bezel ring, or 21mm if using it.

We happen to not use the extra rings on any models where they're optional, but others do.

Note also that even without the extra ring, the diameter of through hole and diameter / depth of rebate for flush mounting on the CHR and A7 series frames are different, so while both drivers may work in the FH3, they're not an easy direct drop in replacement. The solution for that is to fabricate with small removable mounting plates for each different driver model. We've done this several times - in fact three of our current pairs of demos are fitted with these to allow us fairly quick comparisons of drivers.

and, no we all don't look alike - some of us are even uglier in the flesh than our posted personas - note the lack of facebook pages. My own coping mechanism for that is to try to keep a sense of humor, and always laff at my own witticisms, as few others will.
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Old 4th February 2015, 12:48 AM   #1106
Zootalaws is offline Zootalaws  New Zealand
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Is that on the outside or the inside of the baffle, Chris? If it's ok to mount the drivers outboard on a 18mm shim, I would just make up a nice hardwood plate which will allow me to change the driver by changing the plate. For my 'furniture' making I have some nice recessed M5 nuts which could be put to good use for such a purpose.

Click the image to open in full size.

And I will laff at you, if it helps
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Old 4th February 2015, 01:54 AM   #1107
planet10 is online now planet10  Canada
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Quote:
Originally Posted by Zootalaws View Post
nice recessed M5 nuts which could be put to good use for such a purpose.
I'd love to find a source for 35mm long M5 bolts & treaded inserts... they were quite elusive last i went searching. Something with a wide low profile head would be perfect.

That supraBaffle idea is fine, but i would set it up so that the edges are continuous with the side & top of the cabinet

In the middle 1 of ours with removable sB (and MOAP drivers)

Click the image to open in full size.

dave
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Old 4th February 2015, 02:10 AM   #1108
Zootalaws is offline Zootalaws  New Zealand
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Quote:
Originally Posted by planet10 View Post
I'd love to find a source for 35mm long M5 bolts & treaded inserts... they were quite elusive last i went searching. Something with a wide low profile head would be perfect.
Thanks Dave.

As to inserts, I've used these: 100pcs/lot M5*10 M5X10mm Flanged Hex Drive Threaded Insert for Wood screw furniture hardware-in Threaded Insert from Home Improvement on Aliexpress.com | Alibaba Group

But they are more for chipboard/MDF, you can screw them in with a hex key.

Now I use these: 100pcs Silver Furniture M5 Threaded Rivet Nut Flat Head Lightweight-in Rivets from Home Improvement on Aliexpress.com | Alibaba Group

Drill out 6mm glue and hammer home with a mallet. Solid!

There's also these, which I have used and work well - I always glue them: Zinc plated zinc alloy screw nut in furniture(NZ1212)-in Nuts from Home Improvement on Aliexpress.com | Alibaba Group

As to bolts, I use J&G a lot - they can usually find what I need - they have a low-profile M5 in 30mm, no doubt they can locate a 35mm variant - they have a lot of lines, not everything ends up on the web: M5 x 30 DIN7984 Hexagon socket thin / Low / short cheese head cap screws 200 pieces-in Screws from Home Improvement on Aliexpress.com | Alibaba Group

Don't believe their per-unit pricing - everything is negotiable. I usually give them a shopping list and then haggle over final price and freight. I'm miserably tight with a dollar and usually end up satisfied with the deal I have found (from years of buying from China) that getting one guy to source is better than buying from multiple outlets. It's always a good idea to give him the chance to fulfill all your hardware supplies. If they can't get it, they will quickly tell you - not leave you hanging.

The other thing to do is to let them know what quality you are looking for - if you care about quality, tell them. If it's just a basic item, don't worry - but be prepared for a few faults (with screws, I am particular and prefer anodised and stainless and am happy to pay 30c ea to get good ones).

Last edited by Zootalaws; 4th February 2015 at 02:16 AM.
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Old 4th February 2015, 03:10 AM   #1109
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Thanx.

dave
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Old 4th February 2015, 03:32 AM   #1110
chrisb is offline chrisb
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M5 might be more than essential to this particular task - the Rampa (SK, I think) units used on the SB outfitted FH3 in Dave's photo are M4, which happens to be very commonly used in a lot of furniture hardware. Hereabouts it's almost as common as 8/32 thread on cabinet pulls, etc, and easily sourced in a range of lengths and head styles / finishes.
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