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Old 4th November 2010, 08:56 PM   #1
imagios is offline imagios  Czech Republic
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Default Bookshelf with Pioneer B20 and a tweeter

Hello Guys,
I know there is a lot of threads on the Pioneer B20 but I cant find here a nice bookshelf drawing.
I look forward to build a small bookshelf, ok as small as a 8" can be, for the weekend cottage of my girlfriend. It should be a "cheap" project, with decent quality.
I have choosen the "famous" Pioneer B20 as a basis and help him out with a nice tweeter, it could even be more expensive. Lets say I could spend 100$ for all of the components. That gives a nice budged for a decent tweeter.

Does any one has a link for such a project? Any recommendation on the design, tweeter and crossover?

Thanks,
Daniel

PS: unfortunatelly most of the http://www.zillaspeak.com/ link that a lot of threads are reffering to is broken

Last edited by imagios; 4th November 2010 at 09:03 PM.
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Old 4th November 2010, 09:29 PM   #2
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Hi, you can go here...

Single Driver Website

I think the B20 works really well in a small sealed box as small as .75 up to 1.5 cubic foot. I'd be happy to help you with the crossover but first you must choose the tweeter you want to use.

ZillaSpeak.com is not maintained anymore. Please visit www.ZillaAudio.com

Thanks!
Zilla


PS. you can also look here:

Pioneer B20 (BOFU) full range driver plus piezo tweeter

http://www.zillaaudio.com/pioneerb20-3cubox.htm
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Old 4th November 2010, 09:45 PM   #3
imagios is offline imagios  Czech Republic
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Well thanks for the info,
what do you think of the combination with this tweeter:
Eminence APT-80 Super Tweeter
Eminence APT-80 Super Tweeter with 80 Conical Horn | Parts-Express.com

Do you have by any chance the dimension of the 0,75 cubic foot encloasure?
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Old 7th November 2010, 03:43 PM   #4
imagios is offline imagios  Czech Republic
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Thinking of it right now I would like to cross over to the Tweeter at about 2,5KHz, do you think this is a good idea?

Would use a 30 Ohm rezistor with a 4uF cap, would this be adequate?
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Old 8th November 2010, 03:59 AM   #5
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That tweeter is much more efficient than the Pioneer is - you'll need to pad it down significantly. I might go with something more like this:
Dayton DC28FST-8 1-1/8" Silk Dome Truncated Shielded Tweeter | Parts-Express.com
which will probably mate better a be a bit smoother as well as easier on the pocketbook.
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Old 8th November 2010, 04:00 AM   #6
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You might also consider a true mid-woofer rather than the Pioneer if you plan to cross over that low.
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Old 8th November 2010, 08:06 AM   #7
imagios is offline imagios  Czech Republic
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Thanks for the info, you got a point.

Looking at the performance of the Pioneer, he has a significant gab at 2,5Khz and after 5KHz he is quite unstable, so 5KHz is the max. I would like him to go.

If I would use your tweeter and would like to cross over at 5KHz what crossover parts would you recommend?
Thanks
Daniel
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Old 8th November 2010, 11:39 AM   #8
el`Ol is offline el`Ol  Germany
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A bookshelf usually can't be directed towards the listener, so a high-crossed 8"er can give dispersion problems. This tweeter would have the capability to dynamically keep up with an 8"er with lower crossover:
Tweeter dme Sica LP90.28/N92TW (8 ohm)
The Tangband W5-1880 would be a candidate for a 5 kHz crossover solution, but unfortunately more expensive than the Pioneer, the high excursion raises the amount of magnetic material needed.
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Old 8th November 2010, 12:49 PM   #9
imagios is offline imagios  Czech Republic
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The bookshelf would be in a 12m2 room so I would not be affraid of direction towards the listener
As the room is small and the space is limited I need to stay with the bookshelf.
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Old 8th November 2010, 01:29 PM   #10
sreten is offline sreten  United Kingdom
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Hi,

There are loads of better options out there that what you are considering
for compact speakers, and a 6.5" bass / mid will give you far more choice,
even if they have to vented in a box similar sized to an 8" sealed.

Pay particular attention to Zaphs driver tests for choosing drivers.

rgds, sreten.


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