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Old 27th July 2012, 10:18 AM   #1
awqawq is offline awqawq  Sweden
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Default Martello Fr88ex

Hello
I have read all the threads about Martello Fr88ex and decided to build one my self. Right now I building a carbord modell but was wondering, is the model outdated? Are there any better elements right now? (2012)

2 x Fr88ex costs 100$ in Sweden.

If not what kind of amplifier and filter do you need?
A amp from Ebay maybe...
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Old 29th July 2012, 01:38 AM   #2
Bigun is offline Bigun  Canada
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As far as I know the FR88EX is still a current model. I just recently bought another pair and am in the process of building a pair of MARTELLO's. I got mine from Madisound.

I've found them good with both tube amps and with solid state amps.
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Old 29th July 2012, 11:10 AM   #3
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Originally Posted by Bigun View Post
As far as I know the FR88EX is still a current model. I just recently bought another pair and am in the process of building a pair of MARTELLO's. I got mine from Madisound.

I've found them good with both tube amps and with solid state amps.
Thanks Bigun for sharing the awesome Martello.

I just built a cardboard model for fun, but I'm seriously thinking of using it with the Fr88ex.
Click the image to open in full size.

Can you recommend an amp that's a value product like the Fr88ex. Maybe LM1875 ?
And about isolating the inside of a enclosure,what type of material do you recommend?
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Old 29th July 2012, 02:06 PM   #4
Bigun is offline Bigun  Canada
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It looks a lot of fun to play around with this using cardboard.

As for amplifiers, I think your suggestion of a chip amp is a perfectly good one. I have never built one of these, having decided to build with discrete parts for the learning experience. But I wouldn't have any concerns about the sound quality from a chip amp if used within reasonable power levels - suitable for MARTELLO. If you do build a chip amp I would suggest you build a good solid power supply for it as the power supply is a key part of the amplifier and many people have reported that they tend to sound best when the amplifier has plenty of head-room. You may find more of interest here: Chip amp power supply- a beginners guide

One additional thing I would try if I were building a chip amp for my MARTELLO is to experiment with variable damping factor of the output - which you accomplish by putting a low value resistor in series with the speaker output and take the negative feedback from after this resistor. See here: http://sound.westhost.com/project56.htm
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Last edited by Bigun; 29th July 2012 at 02:10 PM.
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Old 29th July 2012, 05:00 PM   #5
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Quote:
Originally Posted by awqawq View Post
2 x Fr88ex costs 100$ in Sweden.
If you are going to spend that much, you might as well go for a pair of FF85wk,

dave
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Old 26th August 2012, 01:07 PM   #6
awqawq is offline awqawq  Sweden
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Quote:
Originally Posted by Bigun View Post
It looks a lot of fun to play around with this using cardboard.

As for amplifiers, I think your suggestion of a chip amp is a perfectly good one. I have never built one of these, having decided to build with discrete parts for the learning experience. But I wouldn't have any concerns about the sound quality from a chip amp if used within reasonable power levels - suitable for MARTELLO. If you do build a chip amp I would suggest you build a good solid power supply for it as the power supply is a key part of the amplifier and many people have reported that they tend to sound best when the amplifier has plenty of head-room. You may find more of interest here: Chip amp power supply- a beginners guide

One additional thing I would try if I were building a chip amp for my MARTELLO is to experiment with variable damping factor of the output - which you accomplish by putting a low value resistor in series with the speaker output and take the negative feedback from after this resistor. See here: Variable Amplifier Impedance

Bigun what kind of isolation do you recommend using aside from felt?
You can see my work progress on imurl, just scroll down.
I just used the rope to temporarily test them. They sound good. Gonna do the hole for the air also.

I have to materials available. One is a kind of material people put in side-windows to make sure air can come in but debre and dust stay out. And the second one is a pillow from IKEA made of polyster fibres. Witch one would you recomend putting in the martellos. You can breath though bout of them, maybe there of same material.
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Old 26th August 2012, 11:24 PM   #7
Bigun is offline Bigun  Canada
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I can see you've done a good job of the cutting and gluing up - well done!

The felt I used isn't ideal actually, it's really a bit on the thin side. I think what you have there looks a bit better, the roll of stuff sitting on top of the pillow looks pretty nice and I'd suggest trying that out. If you aren't sure, you could do an experiment of listening to the speaker without the material and with the material, just clamp the back on tightly instead of gluing it at first. But from the photo's looks like that stuff you have will work well.
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