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Old 29th August 2011, 12:59 AM   #111
Bigun is offline Bigun  Canada
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I was contacted by a person from Indonesia who was not able to obtain this driver, but did have it's brother, the FR89.

These are my thoughts on the suitability of this driver for the Martello enclosure:

First off, I've not tried it of course so I took a quick look at the datasheets for both drivers.

The frequency response curves of both drivers look very similar, no problem there.

Next I took a look at the specifications

fs 95Hz vs 97Hz - close enough so no problem there
VAS 1.269L vs 1.111L - here the's a bit of a difference. I don't think it's critical, the FR89 has a smaller VAS but the driver also has a larger magnet and eats into the enclosure volume slightly
Qts 0.472 vs 0.468 - close enough so no problem there


Lastly I took a look at the physical size:

magnet depth: 38mm vs (46.9mm-4.3mm=) 43.6mm - a noticeable difference, but all this means is that the holey brace behind the driver will need to be shorter to accommodate the deeper driver, just cut it size as you build
hole cut out diameter: 73mm vs 73mm - same, no problem


Overall I'd say yes, that this driver would be suitable. It won't sound exactly the same though. Of course, it might sound better :-)
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Old 3rd November 2011, 11:33 PM   #112
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What would be best if building these?
22mm particle board or 12mm particle board? I have some scrap pieces lying around at home and the drives are quite cheap. A pair of martellos would make a nice gift or just a desktop speaker.
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Old 4th November 2011, 02:26 AM   #113
Bigun is offline Bigun  Canada
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I would suggest the 12mm because it will be a challenge to scale the design for the thicker board. I'm not much of an expert on particle board - don't know how suitable it is for this project. But it's DIY - give it a go and let us know if you like the sound !
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Old 4th November 2011, 02:30 AM   #114
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Go with the 12mm. For a box this small, it should be enough. If course, particle board would not be my first or second choice.
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Old 4th November 2011, 05:01 AM   #115
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Quote:
Originally Posted by Bigun View Post
I would suggest the 12mm because it will be a challenge to scale the design for the thicker board. I'm not much of an expert on particle board - don't know how suitable it is for this project.
Better than MDF, not as good as ply.

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Old 4th November 2011, 09:59 AM   #116
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Okay, as i thought the 12mm would be better. I still have some left from my Mar-Kel70 build. I found the FR88EX in sweden for ~$45/each which seems to be a quite ok price.
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Old 4th November 2011, 10:31 AM   #117
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That is not bad. They are up around $50 now after Neo inflation. I paid a little over half that for mine.

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Old 4th November 2011, 10:32 AM   #118
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Yes i was actually a little "shocked" about the good price. Only ~$5 higher than at madisound, and that's across the ocean where things usually are a lot cheaper than here.
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Old 4th November 2011, 05:18 PM   #119
Bigun is offline Bigun  Canada
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Wow, I didn't know the price was up that much, makes my little speakers more valuable
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Old 4th November 2011, 06:16 PM   #120
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I paid $22.75 each back in February. Now they are listed for $39.90. That is a huge increase. I probably would not have built my Martello's if the drivers had cost that much. Glad I got them when I did.
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