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Old 21st September 2013, 08:46 PM   #21
Bigun is offline Bigun  Canada
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I've now painted the inside of the bottom of the box black so the port will look dark when viewed from outside of the box.

I'm not planning to make it adjustable in the future, rather it will be a fully glued up box. I've installed polyfill batting, the kind you get for making quilts. It's very similar to what I used for my micro-castle build and I used a very similar density. However, this turns out to be quite a bit less than recommended in the pdf build instructions, more like half the density. I'm not to excited about the idea of putting a higher density in there, not because I'd have to do more work, but it already seems a fair bit of stuffing. I don't know if this design favours being over or under damped but I suspect the latter is preferable to the former. Does anybody have some experience with this to offer ?
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Old 23rd September 2013, 11:46 PM   #22
Bigun is offline Bigun  Canada
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No takers ?

I have the boxes playing in my basement system. But I don't know how best to tune the stuffing since I have no reference to compare them with. I can compare with multi-way PMCs but this may not be a fair race. So ... what advice on tuning ?

I assume that I'm tuning for bass. Too much and it's over damped, too little and the FR is lumpy. What else ??
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Old 24th September 2013, 05:23 AM   #23
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Are the drivers fully broken in yet?( i.e 200-300 hrs of soft-core)

I can't keep track of my own projects, much less the myriad of others, but my experience with F & MA branded drivers over the past dozen years would make me cautious re dialing in the tuning or buttoning up the enclosures until the drivers have settled in.
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Old 24th September 2013, 03:05 PM   #24
Bigun is offline Bigun  Canada
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They have about 200 hours on them.

I have calculated that I have only installed half the recommended poly-fill. I have about 11oz per box, installed in the space just below the driver to just above the port. My calculation tells me that I should have 25oz per box. My thought is to double the amount I have so that it matches the design guideline in the pdf plan document. I have double checked the port size and the opening is slightly larger than plan, by around 1/16".

The clarity in the treble is astonishing and imaging is excellent. With the current level of stuffing the bass extension is there, it's smooth & lacks no punch - very dynamic. However, the level of bass is lower than I would expect, it feels to be missing 'weight' in the lower registers.

fyi - I'm using YBA CD source, through Bryston BP60 amp and Zu audio cables.
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Old 24th September 2013, 03:40 PM   #25
chrisb is offline chrisb  Canada
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Got a tube amp handy? Even as low power as 2A3 SE should demonstrate the bandwidth, if not ultimate SPLs of which these guys are capable - but be aware that while the latest incarnation of the 10metals are more efficient, they don't have quite the extension of the 10.2s in the same type of enclosure.
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Old 24th September 2013, 04:11 PM   #26
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Quote:
Originally Posted by Bigun View Post
I have calculated that I have only installed half the recommended poly-fill. I have about 11oz per box, installed in the space just below the driver to just above the port.
That's about 20 grams more than I have in my 12p Super Pencils. I'd be inclined to run the drivers for another 100 hours before changing the stuffing.

jeff
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Old 24th September 2013, 05:05 PM   #27
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FWIW - I glued my front baffle on (face palm) then had to figure out how to do the scallops afterwards. I got a large/long jigsaw bit and reversed it in the jigsaw itself, then used it as a carving tool from the outside of the baffle. It worked exceptionally well, I allowed the teeth to start to cut and shifted the tool left and right, ate away some very respectable scallops.

My experience has been that the bass started to gain authority after the 200 hour mark, and they seemed to improve again after I gave them some muscular volume to deal with. Its definitely enough bass for me and it continues to improve slowly, but I accept that a pronounced visceral bass response is asking too much and I wouldn't want to sacrifice any of the glorious things these drivers do so well!

The soundstage! I occasionally ask myself if I installed another driver in my sleep one night, certain instruments seem to be originating from impossible places.
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Old 24th September 2013, 10:24 PM   #28
Bigun is offline Bigun  Canada
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Jeff - 20 grams is only 0.7 oz ?

Well I moved the stuffing in one speaker upwards so that it goes right up to the top of the box. I guess it probably ends about half way down the box.

Rather than change the bass it sounds to me as if it has smoothed the top end - perhaps by adding a bit more absorption behind the driver itself.

I am listening to some 'pop' which allows me to hear the bass capabilities of the cabs. But the overall tone is clearly tilted upwards - too much. It either wants more bass, or less top end. It's not a peakiness, just an overall tilt that I am hearing.
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Old 24th September 2013, 10:30 PM   #29
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Just a suggestion, it may be worth checking the polarity of the speakers again. Speaking as a man still able to make kindergarten errors, it might be that simple.
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Old 24th September 2013, 11:25 PM   #30
Bigun is offline Bigun  Canada
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No obvious wiring error - I also used the balance control on the amplifier to listen to just one speaker at a time, the tilt in response is quite evident with only one speaker playing. I feel as I'm driving blind right now as I have not done the modelling of these speakers. With most of my projects I get a sense for the outcome and the sensitivity of performance to the parameters. In this case I don't have any such data or intuition to guide me so I'll need to do some more playing around yet.
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