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Old 30th March 2014, 04:23 AM   #1
mikje is offline mikje  United States
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Default My FH3 Build

I've been debating what my next build would be for quite a while. I finally decided on a pair of Frugal-Horn 3's with Alpair 7's. I was ready to pull the trigger on the A7's one evening last week, but for some odd reason decided to hold off. The next day a DIYAudio member was selling a pair, along with a pair of CHP-70's (I already have a pair and LOVE them). I bought both pairs for less than the pair of A7's would have cost if I had ordered them the night before.

So, now I have the A7's and I put them on some very low volume music tonight to get them broken-in.

I got the cabinets built today. I used 5/8 inch chipboard, which is what I almost always use for my speaker builds. They are still pretty rough, but as long as I like the sound, I'll veneer them and do my best to make them look good. I'm going with a supra-baffle so I can try different drivers.

The pictures kind of walk through the build. The first two show how I drew out the curve. After I positioned the yardstick properly, I traced it so the line was visible. Then I used a jigsaw to cut it. Once I had it cut, I marked that piece as my template. If I like the FH3's, I might want to build some more for me or for someone else; thus, the template.

Once I had my template, I used it as the pattern to draw/trace my four sides. Then I cut-out each side piece with my jigsaw. I stayed outside the line I had traced using my template. Once I had all four rough-cut, I lined up my template with the lines I had drawn, screwed it to the side piece, and used my router to trim off the rough-cut edges.

From there, I measured, set, and glued the inside baffles to one side, making sure they were setting 90 degrees to the side. If I do another pair, I might try routering a "dado" slot, like the CNC flat packs. However, my way seemed to work well.

Next I put some of the lining on, and then attached the other side with screws and no glue yet. I want to be able to play with the amount of stuffing, so until I'm done with that, I'll wait to finish gluing everything.

The hole for the speaker is larger than the speaker needs; it's a 5" circle. I then rounded the inside of the hole in the front baffle.
My next step will be the supra-baffle.

Hopefully that was clear enough to follow. I took pics along the way. Maybe they'll clarify my steps.

This wasn't as complex as I had feared. It wasn't as simple as my other builds, but it wasn't bad. A table saw (or circular saw and straight edge guide), a jigsaw, a router, and a drill are the power tools I used. Once I figured out how to draw the curve to the measurements provided, it was pretty easy.

I'm all ears if there are any suggestions.

Mike
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Last edited by mikje; 30th March 2014 at 04:33 AM.
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Old 30th March 2014, 04:24 AM   #2
mikje is offline mikje  United States
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Here are a few more pics of my build. I'll post more as the build progresses.
Mike
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Old 30th March 2014, 04:28 AM   #3
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Looking good Buddy.
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Old 30th March 2014, 04:34 AM   #4
mikje is offline mikje  United States
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Quote:
Originally Posted by cradeldorf View Post
Looking good Buddy.
Thanks!
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Old 30th March 2014, 04:37 AM   #5
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I'm planning the same build, a7s fh3. Cheers for the pictures they help a lot.
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Old 30th March 2014, 05:08 AM   #6
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Quote:
Originally Posted by mikje View Post
Next I put some of the lining on, and then attached the other side with screws and no glue yet. I want to be able to play with the amount of stuffing
With weather strip to ensure a seal?

dave
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Old 30th March 2014, 05:10 AM   #7
mikje is offline mikje  United States
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Originally Posted by planet10 View Post
With weather strip to ensure a seal?

dave
Thanks Dave. I hadn't even thought about that.
Mike
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Old 31st March 2014, 02:32 AM   #8
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Just finished a pair , you will be amazed at what they can do for the size
Looking good!! Take time on the stuffing, played with mine quite a bit till I got it sounding the way I wanted.
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Old 31st March 2014, 02:35 AM   #9
mikje is offline mikje  United States
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Can anyone give me an idea of how much lower the FH3 will reach compared to a Pensil, both using an A7?
Thanks,
Mike
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Old 31st March 2014, 02:59 AM   #10
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Pensil probably goes lower. FH3 has more (potential) gain.

dave
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