"Cyburgs-Stick" featuring W4-655SA - Page 3 - diyAudio
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Old 21st May 2007, 08:55 AM   #21
alspe is offline alspe  Finland
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Join Date: Jan 2007
Location: Finland/Tampere
Hi,

I've made Cyburgs Sticks too. I did box 1 cm smaller in width and 1 cm bigger in depth. Volyme and tuning are same. Enclosure is 16 mm MDF finished with real birch veneer.

Sound is... How I can say? Bass is very strong even in my 20-30 m2 room. But I'm not pleased with midrange and treble. Highest treble has fade off and midrange is not very detailed. Of course we are speaking about 22 € speaker. Total cost for pair is about 130-140 € because of high quatily components ja box materials. Good thing is that girlfriend likes looks :-) First comment when amplifier was off was that they look nice! Women....

I've listening them for a couple of hours and they might sound better later when rubber surrounding has softened.

Here is links to my pictures and project (in finnish).

http://picasaweb.google.com/ali.maki...istatTBW4657SC
http://www.dvdplaza.fi/forums/showthread.php?t=58678
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Old 22nd May 2007, 12:12 PM   #22
gychang is offline gychang  United States
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Join Date: Feb 2005
Location: Davis, California
Quote:
Originally posted by MuaDibb
If you have the 871S already, I would suggest a downward firing BIB. If, you can put them in corners.

I am in the midst of building this BIB (unfolded 7 ft design), would like to see a separate thread especially if you have pictures...

gychang
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Old 22nd May 2007, 10:09 PM   #23
Cyburgs is offline Cyburgs  Austria
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Join Date: Mar 2004
Location: Austria
@alspe:

Very nice woodwork, these are one of the nicest sticks I've seen so far!

Unfortunately I am not surprised that you are not satisfied with the sound they produce, although you did everything right, except one essential thing: You took the wrong driver!
The Stick is constructed for the W4-655SA, it will also work well with the W4-655A, which has nearly the same parameters, but the W4-657SC is a totally different animal.
If you look at the basic parameters (both measurements from german diy-loudspeaker magazine Hobby-Hifi which delivers very good measurement data in my experience):

W4-657SC: fs 46 Hz QTS 0,36 VAS 10 l
W4-655SA: fs 72 Hz QTS 0,36 VAS 4,5 l

You see that these two drivers need totally different enclosures. The W4-657SC needs only a simple and quite small BR-enclosure to give nice bass. The double bass reflex enclosure of the Stick is seriously misaligned for this driver.

The frequency response of the W4-657SC is also not compareable with the W4-655SA. It has some quite heavy dips and peaks, where the W4-655SA is quite smooth. So the correction filters of the stick do absolutely not fit to the W4-657SC, which furthermore is, and I may quote Hobby-Hifi again (translation by me): "Although the W4-657SC of Tangband is only a mediocre Fullrange speaker, it is an excellent midbass driver, perfect for a small monitor speaker with Highend-ambitions."

So I can only strongly suggest to equip your very nice speakers with W4-655SAs, then the sound will fit to the optical impression. :-)

Nice greetings, Berndt

edit: And please use black screws ;-)
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Old 23rd May 2007, 04:49 AM   #24
alspe is offline alspe  Finland
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Join Date: Jan 2007
Location: Finland/Tampere
OK, thanks for advice.

I knew that driver is (slightly) different but time when I bought driver's there were no W4-655SA's in Finland. I thought that 657SC's would be enough close. I'm often too optimistic

I got advices from finnish fullrange builders and they think that there's too much damping in enclosure. Yesterday I take some off and sound became much better. Now there is no damping in side walls of upper box.

Now I can buy W4-655SA's, finnish retailer had those now. W4-655SA's Is that correct driver?

Now my Sticks have strong bass but it's a bit boomy. Midrange is little too low level and undetailed, like singer being behind curtain. Will bass be strong with W4-655SA even it has much lower Fs? But quality comes first

I will use black screws and will do black fabric front grilles.

-Ali
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Old 23rd May 2007, 11:23 AM   #25
gychang is offline gychang  United States
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Join Date: Feb 2005
Location: Davis, California
Quote:
Originally posted by Cyburgs

The parameters for the W4-655SA measured by the german Hifi-DIY-magazine Klang&Ton for example are as follows:
Qt: 0,43
fs: 77,89
VAS: 4,3

Nice greetings, Berndt

anyone know where I can get the drivers in USA? or is there an equal substitute?

gychang
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Old 25th May 2007, 01:59 AM   #26
chuck55 is offline chuck55  United States
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Join Date: Dec 2003
Location: New England
W4-657SC: fs 46 Hz QTS 0,36 VAS 10 l

From Tang-Band's website:

W4-657SC

Free air resonance: 65 Hz
Qts: 0.36
Vas: 6.04 L

W4-655SA:

Free air resonance: 70 hz
Qts: 0.33
Vas: 5.09 L
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Old 25th May 2007, 04:24 AM   #27
alspe is offline alspe  Finland
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Join Date: Jan 2007
Location: Finland/Tampere
They are not very different by parameters? Same enclosure should fit for both drivers if we believe Tangband parameters. Ofcourse higher frequencies aren't same.
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Old 27th May 2007, 03:49 AM   #28
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Join Date: Dec 2004
Default w4 655 substitute

I'm looking for a substitute driver available over here on the other side of the Atlantic too. This is the closest I can find:

http://www.partsexpress.com/pe/showd...number=264-848

Specs are: fs 70hz, vas 4.86l, qts .37

Datasheet:

www.tb-speaker.com/detail/1230_04/w4-1337sa.htm

The frequency response is different, so it would need a different notch filter. They also pricey - $56.40us (40.62 euros) - but they're the closest thing I can find in the U.S.

Are these a reasonable substitute?

Mike.
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Old 3rd July 2007, 05:25 PM   #29
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Join Date: Apr 2006
Location: Reykjavík
Quote:
Originally posted by chuck55
IMHO I would not use the W4-1320. This has a rising FR and is designed for OB.
I think the W4-616 is closer to the W4-655 although probably not as good.
Thanks for the point about the 1320s. If we set the equation up so that the FR is tamed by a theoretical and "perfect" digital EQ, would you estimate that the W4-1320 speaker and its parameters are suited to the Sticks?
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Old 5th July 2007, 03:11 AM   #30
chuck55 is offline chuck55  United States
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Location: New England
RE W4-1320.
Why try to make a driver work that is not suited to the job?
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