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Old 4th June 2013, 12:16 AM   #331
Bigun is offline Bigun  Canada
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Yes, it ended up full sized. Probably it's a bit larger than what I forecasted. The idea is to ensure it's large enough that 'aperiodic' is not required.

And I agree, sealed should be very good. This was my original design intent. But open back boxes are also of interest so that is why I'm exploring both options.
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Old 4th June 2013, 01:26 AM   #332
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foam ? like the grey finger stuf at parts express, but sandwiched together so it is thicker.

Wow, that'd be a big, big box. The qts and the vas makes it like the fifteen inch "woofers of old" needing 15ft3 for porteds, eek.


Found this on low bass coming from a too small open baffle.

Sideways Dipole Bass
post #24
"If wavelength become larger (say >1m for "small rooms"), the dipole no longer shows its figure 8, but increasingly feeds the inidividual room modes only. The bass you will get at a certain position in the room will be the bass which the room modes produce there. That is the same procedure as for other bass loudspeakers, but with a somewhat different mode excitation."

Explains why your 2' deep open baffle seems to have some low bass.
I like your box design.
It one of the only options for that driver (in my opinion).

interesting........................

Norman

Last edited by norman bates; 4th June 2013 at 01:35 AM.
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Old 4th June 2013, 06:58 PM   #333
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Perhaps you should try to dampen the backwave like this Mpl
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Old 5th June 2013, 11:55 AM   #334
Bigun is offline Bigun  Canada
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I have put some old clothes in the back of the box to absorb the high frequencies - a poor mans Boffle but I need to do some more experiments. The day job keeps me a bit occupied but perhaps this weekend will yield some time to play.

I don't think the uneven bass response will be acceptable if I keep it open backed, some kind of EQ will be needed. It might be possible to implement a line level passive EQ, or perhaps I should go 'modern' and get one of those miniDSP gadgets to play with ?
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Old 5th June 2013, 12:18 PM   #335
IG81 is offline IG81  Canada
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MiniDSP is pretty great. It might matter to some that they can't say they listen 100% analog anymore, but it certainly does not ruin listening to vinyl for me; I don't think I could tell if I didn't know. In your case though, I'd try to find the best acoustic solution before going with electrical corrections. Since you went for the full-size build (I assume 13.6cu.f), you already have a nice medium sealed Qtc and might only need some lining on the walls. Model shows f3 in the mid 40ies, not too shabby.

IG
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Old 9th June 2013, 09:17 PM   #336
Bigun is offline Bigun  Canada
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I will be working on a non-DSP signal chain for now, for sure.

Interesting - I didn't know there was a new hi-end speaker manufacturer in Canada using the Audio Nirvana (I think the largest size is 12" though): RJH Audio Extremely Efficient Full Range Single Point Source Loudspeakers for the Discerning Listener.
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Old 10th June 2013, 09:52 AM   #337
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Didn't you said you'd seal the rear a half a year ago ?

I know that's "the pot calling the kettle black" as I have many an unfinished projects.

Norman
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Old 7th September 2013, 07:55 PM   #338
Bigun is offline Bigun  Canada
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Well I actually put the back on the box for the first time today. I fit some batting on some of the internal surfaces and took out my kids old clothes before I bolted on the back.

I also had to fit a terminal cup.

My tube amp isn't sounding so good these days, maybe the tube is getting old. So I popped in my Bryston BP60 to listen to the top 40.

Strange thing - seems to me that there is less bass. The sound is very clean but the balance is tilted up. The back may have to come back off...
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Last edited by Bigun; 7th September 2013 at 07:57 PM.
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Old 7th September 2013, 10:33 PM   #339
freddi is offline freddi  United States
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if they generally meet spec then one should play in a Karlson 18 the size of the Cetec-Gauss 5181 cabinet - it needs a stronger motor to do best in K15 but would probably sound pretty good in one

5181 plan - the rectangular indications on the sides were pockets for carrying handles. It probably would not hurt to open up the starting gap a bit
http://img72.imageshack.us/img72/825/gaussbracing.jpg

Last edited by freddi; 7th September 2013 at 10:45 PM.
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Old 8th September 2013, 01:15 AM   #340
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maybe that the ob has more midbass, tricking the ear/brain to think there is more low bass (like a bass guitar or a max-bass effect box).

My "phy style" hinged open baffles are penned in for october.
I love my phillips crossed at 100hz.

Sand filled walls, not fun.

Norman

Last edited by norman bates; 8th September 2013 at 01:17 AM.
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