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Old 15th April 2012, 05:31 PM   #1
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Default All speaker gurus (including FR guys) need advice.

Hello all,

I have a pair of Sansui book shelf speakers from 1991 approx. and was wondering if I could replace the speakers with some of much better quality. The woofy is 6.5 diameter and the tweeter is a horn type. The cabs are sealed. The wood is 3/4 MDF and the dimensions are 8.5 x 9.5 x 14.5 inches (19.1872036 liters minus the 3.4 inch MDF...whatever that is). Any ideas or recommendations on what I could replace these with?

Thanks in advance for your time.

Spiro
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Last edited by aptquark; 15th April 2012 at 05:43 PM.
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Old 15th April 2012, 05:56 PM   #2
sreten is offline sreten  United Kingdom
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Hi,

This should suit, built sealed :

Parts Express DIY Project

Click the image to open in full size.

Though you may need to used the truncated version of the tweeter :

Dayton Audio DC28FT-8 1-1/8" Silk Dome Truncated Tweeter 275-076

Click the image to open in full size.

rgds, sreten.
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Last edited by sreten; 15th April 2012 at 06:01 PM.
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Old 15th April 2012, 05:59 PM   #3
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Sreten...you think the vol. will work? Also, I dont mind cutting the cabs if needed. There was also a lot of insulation in the cabs...should I put that back in if I go with your suggestion?

Thanks for the quick reply!
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Old 15th April 2012, 06:01 PM   #4
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Also, the article suggest a ported design...not sealed? I dont mind adding the port...you think it would be better than sealed?

19.1872036 liters = 0.6775897 cu. feet...minus the 3/4 MDF should yield the approx recommended size in the article?

Last edited by aptquark; 15th April 2012 at 06:09 PM.
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Old 15th April 2012, 06:09 PM   #5
sreten is offline sreten  United Kingdom
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Hi,

Zaph|Audio - Bargain Aluminum MTM

Indicates porting is probably barking up the wrong tree at that box volume.

rgds, sreten.

I calculated your cabinets at 0.42 cuft, which indicated sealed to me for that driver.
I'd rather go sealed and well stuffed than a marginal vented alignment, which
it is at 12L. IMO you'd want 20L+ for a good sounding vented alignment.
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Last edited by sreten; 15th April 2012 at 06:28 PM.
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Old 15th April 2012, 06:14 PM   #6
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MTM huh? I cant do that with this cab though. So basically, if I used only one woofer..the sensitivity would be lower than 2 correct?
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Old 15th April 2012, 06:23 PM   #7
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20L sealed is pretty decent.

What are your thoughts on constructing your own overtop (so that you can bevel or round over the corners) and getting some Mass Loaded Vinyl and acoustic fill on the inside of the cabinet?

Here is a rather high-end design with sufficiently close design dimensions (9"w x 16"h x 10"d and 15L)

As long as you mass load the walls a bit (and add some bracing) you should come very close to that 15L. Then you just add the vent and voila:

Mandolin Speaker Kit / Pr

Of course, constructing the box from scratch would get the best possible results

But still, this will give you fantastic performance from 40hz to 20khz.

Last edited by RockLeeEV; 15th April 2012 at 06:26 PM.
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Old 15th April 2012, 06:28 PM   #8
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Quote:
Originally Posted by RockLeeEV View Post
20L sealed is pretty decent.

What are your thoughts on constructing your own overtop (so that you can bevel or round over the corners) and getting some Mass Loaded Vinyl and acoustic fill on the inside of the cabinet?

Here is a rather high-end design with sufficiently close design dimensions (9"w x 16"h x 10"d and 15L)

As long as you mass load the walls a bit (and add some bracing) you should come very close to that 15L. Then you just add the vent and voila:

Mandolin Speaker Kit / Pr

Of course, constructing the box from scratch would get the best possible results

But still, this will give you fantastic performance from 40hz to 20khz.
Great drivers...but want to keep it cheaper and also try to not build other cabs.

I will be building some floor standers later, so I was trying to do a cheap quick and dirty on this build.

Thanks
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Old 15th April 2012, 10:02 PM   #9
sreten is offline sreten  United Kingdom
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Hi,

They are not 20L, they are around 12L and of course a 4
ohm MTM would be a lot more efficient, nature of the beast.

The Karma Indignia is a design by committee, with what that
entails. Sealed vs. ported was inevitably resolved by making
it ported and saying you can always block the ports, but I
personally wouldn't bother cutting out and fitting ports.
Well stuffed sealed will be better than half-baked ported.

If you do go for the KI's it will be fairly cheap, fairly quick,
and not particularly dirty, and presumably miles better
than the current drivers and x/o, but expect a drop in
efficiency, to go with far better bass extension.

Not the last word in quality, more like the first real step.

rgds, sreten.

Depending on placement they'd probably benefit from
a little bass bass boost from a typical tone control.
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Last edited by sreten; 15th April 2012 at 10:18 PM.
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Old 15th April 2012, 10:58 PM   #10
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some Sansui drivers of that era weren't too bad, typically mid-q drivers in a box a bit too small....
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