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Frugel-Horn Mk3 Builds & Build Questions
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Old 16th August 2017, 02:07 AM   #1281
planet10 is offline planet10  Canada
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Frugel-Horn Mk3 Builds & Build Questions
I can supply DWG/DXF files from the pdf. I cannot tweak them for a particular CNC — kerf zllowed on the drawings is 5mm, a CNC bit is usually wider than that. 15mm is fine, and there are drawings for that, especially with the Pluvias, which can get away without any rebate on the front, and if you do a rebate it is not that large. None of the drawings have the exact cutout for the Pluvia so that would need adjustment.

Here is the standard DWG?DXF/CNC boilerplate:

<boilerplate>
DXF or DWG files are easily exported from the CAD software, native format is Vectorworks. I need to know the page of the PDF you need, and the version of DXF/DWG that can be handled. (i do have a collection of already exported)

It should be noted that a CNC is only really useful for the sides and the driver rebate. Unless the CNC is 5-axis, you will still need to pass all the internal pieces thru a table saw -- it is quicker & easier to just do them all on a table saw. You could rough cut the other pieces but they still need to go thru a table saw to angle the ends.

The drawings all assume a 5 mm kerf, so the CNC operator would need to adjust for the larger kerf needed for CNC work. You/they will need to adjust for actual wood thickness as well.
</boilerplate>

dave
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Old 16th August 2017, 04:48 PM   #1282
chrisb is offline chrisb
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Since the Pluvias mounting flange is much thinner than the A7s and most of the CH series, they don't require rebating, and 15mm would be sufficient for the front baffle - but then will definitely need the rear of the driver cut-out to be chamfered.

Also note, as Dave says, that there is only one of the lateral panels - the vertical internal divider - that doesn't require a 5 dg angle on at least one end, and on the Planet10 kits, a scarfe joint is used to add some additional glue surface area at the joint between it and the back panel. I also set the fillet radius on the CNC route for those internal panels to 3/8" and radius the ends at that joint to match. This makes for a very secure joint - the radius is probably not critical acoustically.

see post#2 in the mock assembly thread
Frugel-Horn Mk3 Flat-Pak Mock Assembly Instructions
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Old 30th August 2017, 05:48 AM   #1283
3tu3ni is offline 3tu3ni  Malaysia
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Thanks for the hint Dave and Chris. I will discuss them with the guys at the CNC place.

In the meantime, I just received the Pluvias, yeay.

Noob question - I have an old ipod lying around and wondering if I can just use it to 'break-in' the Pluvias, how do I do it ya? Or shall I just use the audio output from my iMac to do the low volume long hours break-in?
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Old 30th August 2017, 06:18 AM   #1284
planet10 is offline planet10  Canada
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You can try driving the Pluvia with an iPod, but i suspect you will need to put an amp between the output & the speakers. The same with the iMac. I think the LuxoLamp was the last one that could directly drive a speaker.

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Old 19th November 2017, 04:48 PM   #1285
kwolff67 is offline kwolff67  United States
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Hi, I have the flat pak 15mm MK3's with the fe126en cutout. I've been considering a switch to the Alpair 7.3 sometime soon, and wanted to confirm based on older posts here:

I should glue 9mm (3/8 US) Baltic Birch to the entire length of the front and then rebate for the 7.3 with a router to make the bezel fush? Should I use wood filler to fill the old FE126en rebate to eliminate the gap left behind or is it too small to matter?

I also need to add additional poly-fill for the Alpair too, correct?

Thanks.
Kevin

Last edited by kwolff67; 19th November 2017 at 04:57 PM.
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Old 19th November 2017, 08:29 PM   #1286
planet10 is offline planet10  Canada
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Quote:
Originally Posted by kwolff67 View Post
I have the flat pak 15mm MK3's with the fe126en cutout. I've been considering a switch to the Alpair 7.3 sometime soon, and wanted to confirm based on older posts here:

I should glue 9mm (3/8 US) Baltic Birch to the entire length of the front and then rebate for the 7.3 with a router to make the bezel fush? Should I use wood filler to fill the old FE126en rebate to eliminate the gap left behind or is it too small to matter?

I also need to add additional poly-fill for the Alpair too, correct?
Attached is a comparison of the A7.3 vrs FE126En rebate. The dark blue is the A7.3 with bezel cover, the lighter blue without.

If you have a P10-hifi flat-pak then the baffle is 18mm, and althou tricky, you can just rebate for the A7. If you use the bezel cover (we donít use it) then no one will know it started out as an FE126 rebate. If you donít then some fill will be needed to make it pretty.

Alternatively you can ream out a big hole on the baffle and fit a supraBaffle (lots of options wrt shape) and rebate it for A7.3.

Yes, the A7.3 will need a bit more damping. All below the driver. We supply 40g for each speaker, but typically only half of that is needed ó room, room placement, taste all play a role. We supply FE126 flat-paks with 40g as optional fill for under the driver (usually not used), so half of that in each speaker will get you into the ballpark.

dave
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File Type: png A73-v-FE12x-rebate.png (12.9 KB, 167 views)
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Old 19th November 2017, 08:48 PM   #1287
kwolff67 is offline kwolff67  United States
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Quote:
Originally Posted by planet10 View Post
Attached is a comparison of the A7.3 vrs FE126En rebate. The dark blue is the A7.3 with bezel cover, the lighter blue without.

If you have a P10-hifi flat-pak then the baffle is 18mm, and althou tricky, you can just rebate for the A7. If you use the bezel cover (we donít use it) then no one will know it started out as an FE126 rebate. If you donít then some fill will be needed to make it pretty.

Alternatively you can ream out a big hole on the baffle and fit a supraBaffle (lots of options wrt shape) and rebate it for A7.3.

Yes, the A7.3 will need a bit more damping. All below the driver. We supply 40g for each speaker, but typically only half of that is needed ó room, room placement, taste all play a role. We supply FE126 flat-paks with 40g as optional fill for under the driver (usually not used), so half of that in each speaker will get you into the ballpark.

dave
Yes, I have the P10 flat pak. Ok, this gives me some options.
Thanks.
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Old 19th November 2017, 10:48 PM   #1288
chrisb is offline chrisb
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As Dave notes, we don’t normally use the extra bezel rings on either our personal build or any of the kits, but his would be a case where they’d probably be justified. Although that means a deeper rebate for flush mounting, with less core of the 18mm baffle left for the screws, I think you’d still be fine. The BB ply is very strong, and with right sized pilot holes and pre-tapping with the MA supplied screws, a more than secure mounting will be achieved. The drivers aren’t heavy, and this ain’t the cylinder head of a Cummins Diesel engine.
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Last edited by chrisb; 19th November 2017 at 10:49 PM. Reason: spellers
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Old 19th November 2017, 11:13 PM   #1289
kwolff67 is offline kwolff67  United States
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Quote:
Originally Posted by chrisb View Post
As Dave notes, we don’t normally use the extra bezel rings on either our personal build or any of the kits, but his would be a case where they’d probably be justified. Although that means a deeper rebate for flush mounting, with less core of the 18mm baffle left for the screws, I think you’d still be fine. The BB ply is very strong, and with right sized pilot holes and pre-tapping with the MA supplied screws, a more than secure mounting will be achieved. The drivers aren’t heavy, and this ain’t the cylinder head of a Cummins Diesel engine.
I think I'm leaning towards a removable supra baffle so that I can try a variety of drivers. I'm building the Amp Camp ACA amp right now and I think I've caught the bug and it won't be my last amp.

I have access to quite a bit of woodworking equipment right now and although my skills are still beginner figured I should take advantage while I can. My listening area right now is small (10x11) so sticking with a modifiable FH3 seems to be the best course rather than building another speaker.

Last edited by kwolff67; 19th November 2017 at 11:22 PM.
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Old 20th November 2017, 04:19 PM   #1290
chrisb is offline chrisb
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We built a few with removable baffles, and I embedded M4 threaded inserts (not T-Nuts) in the enclosure, and counter sunk holes in the removable panels. We also extended them wider than the full 170mm, and added little return pieces to wrap around the sides.

Attached is PDF of my CAD drawing for the CNC patterns for these, as well as the first photo I could find in my files of an FH3 fitted with the SB - seen with MAOP7, and a prototype build of FHXL . If you're interested, there are a couple of kits of the supra-baffle parts for both FE126 and A7.3 available.
Attached Images
File Type: jpg FH3-FHXL002.JPG (435.9 KB, 123 views)
Attached Files
File Type: pdf FH3 supra.pdf (38.4 KB, 18 views)
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