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10F/8424 & RS225-8 FAST Ref Monitor
10F/8424 & RS225-8 FAST Ref Monitor
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Old 16th January 2018, 03:03 PM   #981
pcgab is offline pcgab  United States
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10F/8424 & RS225-8 FAST Ref Monitor
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Originally Posted by silasmellor View Post
Interesting, is this move inspired by a deficiency in your previous XPS foam build, or is it due to differences in the absorbent properties of BB vs foam?

I've seen Troels Gravesen recommend bitumen pads for lining the interior of some of his speakers (with felt on top). One thing he seems to keep mentioning is to glue them on with additional adhesive since the stuff they come with tends to weaken with time and cause them to fall off...

Another question, if one was to substitute the 10F for another driver, which of the TS parameters would you be most worried about matching? Or do you consider the 10F critical to the success of this speaker?

That's precisely what I did. I used vinyl floor tile glue, once cured they are adhered extremely well.

I then glued on natural wool felt.
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Old 16th January 2018, 04:21 PM   #982
xrk971 is offline xrk971  United States
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Originally Posted by zman01 View Post
X,

Since you mention a Fountek aluminum cone driver, maybe the FE85 can be an option; much lower cost vs the FR88EX, with lower Xmax. From the specs it looks like the FE85 was likely to be designed for more of a mid-tweet application.
Thanks for that tip. The FE85 graph looks superb - with great high end extension. I should try it.

https://www.parts-express.com/pedocs...ifications.PDF

Only $12 too.
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Old 16th January 2018, 04:22 PM   #983
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Originally Posted by pcgab View Post
That's precisely what I did. I used vinyl floor tile glue, once cured they are adhered extremely well.

I then glued on natural wool felt.
Nice work - can I see any measurements of your system? I am particularly interested in the distortion curves with all this treatment, to see what I can expect from a similar construction technque. What does a 50mm BB ply box weigh for this speaker?
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Old 16th January 2018, 04:37 PM   #984
pcgab is offline pcgab  United States
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Originally Posted by xrk971 View Post
Nice work - can I see any measurements of your system? I am particularly interested in the distortion curves with all this treatment, to see what I can expect from a similar construction technque. What does a 50mm BB ply box weigh for this speaker?
Bah! I mis-spoke yesterday, the walls are 25mm Baltic Birch, not 50mm. I'll weigh them without the baffles when I switch over to the next set of test baffles.

Mitigating distortion was the goal, generally. Basically, I can get 12mm(~1/2") 5 minutes from my house, where as 18mm(~3/4") is an hour away. So, I tend to just buy the 12mm, and laminate two pieces together.

I haven't measured those cabs yet, but will try to do some quick ones this weekend, or next week when I have a bit of time.

Cheers~
Gable
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Old 16th January 2018, 07:57 PM   #985
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If laminating 12mm, use a non-hardening glue land you get a extra dampening from mass constrained layers effect. A non-hardening sub floor adhesive like liquid nails might work, or even latex exterior caulking. Even better is to spray 3M 77 Fast-tack onto a butyl rubber pond liner sheets (2mm thick) and bond MDF panels to that as a sandwich.
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Old 16th January 2018, 08:12 PM   #986
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Originally Posted by xrk971 View Post
If laminating 12mm, use a non-hardening glue land you get a extra dampening from mass constrained layers effect. A non-hardening sub floor adhesive like liquid nails might work, or even latex exterior caulking. Even better is to spray 3M 77 Fast-tack onto a butyl rubber pond liner sheets (2mm thick) and bond MDF panels to that as a sandwich.
Pond liner sheets, damn clever idea!

I used this:
http://a.co/icPfIFv

Glued to the interior walls, then 1/2" wool felt.

Constraining pond liners between laminations is a good idea, I may have to experiment with that at some point.
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Old 16th January 2018, 08:35 PM   #987
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Pond liner wasn't my idea. It was Z transform's idea from this thread. He recommends this:

Quote:
The damping sheet is roofing "ice shield" commonly used here in the Northeast to stop water from backing up underneath shingles and leaking in the winter. It's made from a combination of slag, asphalt and binders with an aggressive pressure sensitive adhesive (PSA) on one side and a thin plastic "foil" on the other. It's heavy and just a little gooey- and completely dead. A roll big enough for all the hobby speakers you ever want to build costs $75.
Click the image to open in full size.

You can see it in between the MDF sandwich:
Click the image to open in full size.

But I recall there were conversations about pond liner...

Novel Open Baffle Construction Techniques

I use the exact same Noico sheets on the interior wall of my cabs. They work well but leave your fingers and whatever they touch a black yucky mess. They sound a lot like the roofing material above.
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Last edited by xrk971; 16th January 2018 at 08:42 PM.
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