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Old 17th July 2013, 12:56 AM   #21
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Originally Posted by AndrewR View Post
By the way, is glueing 10mm thick open cell packing foam along the inside of the top, bottom and back panels a useful alternative approach to stuffing with Dacron?
Not IMHO.

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Old 17th July 2013, 01:54 AM   #22
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I find foam to be in general useless. Get some decent acoustic fiberglass -- 5/8"-1" thick.

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Old 17th July 2013, 07:21 AM   #23
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Re changing the WxD ratio, yes, providing you hold the vent CSA as designed.

On the subject of the foam, no, as Bob says it's useless at the best of times, and this box was specifically designed for stuffing, not lining -it won't work properly with the latter.
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Old 17th July 2013, 11:50 PM   #24
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Thanks Scott and Bob. Dacron it is, then.

I might staple the Dacron at the top and back just to stop it dropping - if it is possible to staple the stuff.

@IG81, I still need to have a look at your amp-gain solution, but I think that a log pot is the simpler and more effective solution. How are you currently controlling the volume on your amp?

Cheers,

Andrew
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Old 18th July 2013, 12:04 AM   #25
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Quote:
Originally Posted by AndrewR View Post
I might staple the Dacron at the top and back just to stop it dropping - if it is possible to staple the stuff.
I've used tulle to hold up dacron fill. Not difficult to staple inside a box. Any fabric store will have it, as it's used extensively in dress making.

jeff
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Old 18th July 2013, 01:11 PM   #26
IG81 is offline IG81  Canada
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Quote:
Originally Posted by AndrewR View Post

@IG81, I still need to have a look at your amp-gain solution, but I think that a log pot is the simpler and more effective solution. How are you currently controlling the volume on your amp?

Cheers,

Andrew
I checked my idea in more detail and realised it's probably not feasible the way I wanted it. It might be doable, but it'd "waste" one channel per board and bridging might not be possible the way the feedback will now be introduced, so we're stuck with 30dB of gain. I'm using an ALPS Blue Velvet 100K pot to attenuate, but gain could still stand to be somewhere between 15-20dB IMO. Ultimately, it depends on how much your source puts out and ideally match this up to the max power output of the chip.

IG
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Old 18th July 2013, 06:09 PM   #27
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Just a point -the damping is nominally a uniform density throughout, as noted, so it doesn't really need holding up. You could put a couple of dowel-rods across it just above the vent to help keep things looking neat. A removable back, as mentioned, is useful since it allows much easier access to the interior so the density & even location can be adjusted to suit.
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Old 22nd July 2013, 11:37 PM   #28
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Baltic Birch is on order, cut to size. Also the FF105WK drivers are on order.

I don't have the space or woodworking tools. The Dremel turned out a dead loss, so I may get the pieces machined at the local prototyping business. Either that or I use a rabbet plane and hand tools. Will keep you informed.

Andrew
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Old 18th August 2013, 01:35 AM   #29
AndrewR is offline AndrewR  United Kingdom
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Just to let you know that these loudspeakers are coming along nicely.

After optimising the amount of Dacron stuffing and adding a dowel across & above the port, I am now gluing the final side panel to each loudspeaker.

Even when testing, just using the clamps to hold the final panel and without yet screwing the spikes into the insert-nuts, the sound is fab (magical and responsive). I do suspect the drivers need some break-in, can anyone describe what the Fostex FF range is like when running in?

I could do with a touch more bass, but the spikes and placing them closer to the wall should help.

Regarding the Dacron, for each side I laid 165 grams evenly along the enclosure (using a fan-style pleat) and found that adding a further 33 grams behind the driver helped give more body. Even changing the amount of stuffing by 10 grams made a massive difference. I think I've found the sweet spot amount between too treble-y and too dull.

Photos will be coming in a few days.

Andrew
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Old 19th August 2013, 01:18 PM   #30
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I'll be looking forward to the pictures, should be fun!

IG
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