My 6,5" Westra driver? What can i do with it?

[Dxvideo]

Hi all,

I have a Westra KW160-1374 (in fact a pair of) bass speaker. And i want to make a little subwoofer with it. I will drive it a 50W power amp and of course a sub xover. I also want it in tiny sizes and have a lot of deep bass.

What do you recommend about that project? What kind of box must i use for it?

Thanks a lot for your recommendations..

 

[richie00boy]

Thiele-Small parameters needed...

 

[Cal Weldon]

This is all I could find through Google:


16cm Tiefmitteltöner
Beschichtete Papiermembran, inverse Kalotte, Gummisicke.
In 4 Ohm jetzt wieder lieferbar!
Technische Daten:
Belastbarkeit: 50 W-RMS / 80 W-Max
Impedanz: 4 Ohm
Schalldruck: 85 dB
Frequenzbereich: 45-4000 Hz
Resonanzfrequenz fs: 45 Hz
Gesamtgüte Qts: 0,5
Äquivalentvolumen Vas: ca.25 l

Einbaumaße:
Außendurchmesser: 165 mm
Einbaudurchmesser: 148 mm
Einbautiefe (incl. Korb): 76 mm
Korbrandhöhe: 4 mm

 

[richie00boy]

Qts is quite high, would need a fairly large box for vented use, so I'm afraid tiny size and deep bass are out of the question - you're going to be looking at around 30 litres.

 

[Dxvideo]

I guess 30lt is ok. As i calculated in Winisd; with 50lt box F3 will around 32Hz.. Do you think its deep bass? Will i satisfy?

 

[simon5]

Maybe, maybe not, try it!

There's limits as what you can do with 6.5s.

 

[Dxvideo]

I'm not good at wood works so will go to a carpenter to make the box! Sure i will try it but i want to have an idea that how it works? Will it be like my Jazz 9940 speaker's subwoofer? What do you think?

 

[12 Cents]

a suggestion

Transmission line... just a suggestion, 1m high, folded 1 time, diameter decreasing from driver to opening.

 

[12 Cents]

or for the sub, you may want to make a bandpass and mount the two drivers like this:


+---------------------------------------+
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| . . . . . .=========. . . . . . . . . |
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| . . . . . .=========. . . . . . . . . |
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| . . . . / . . . . . . \ . . . . . . . |
| . . . / . . . . . . . . \ . . . . . . |
+----EEEEEEEEEEEEEEEEEEEEEEEEE----------+
| . . . \ . . . . . . . . / . . . . . . |
| . . . . \ . . . . . . / . . . . . . . |
| . . . . . \ . . . . / . . . . . . . . |
| . . . . . .=========. . . . . . . . . |
| . . . . . | . . . . | . . . . . . . . |
| . . . . . .=========. . . . . . . . . |
| . . . . . . . . . . . . .-------------+
|
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| . . . . . . . . . . . . .-------------+
| . . . . . . . . . . . . . . . . . . . |
+---------------------------------------+


Best,
Lukas

 

[richie00boy]

A 6.5 inch driver will never be a sub, no matter how low the graph on WinISD says it will go. This is simply because to get low bass you need to move a lot of air.

 

[Dxvideo]

Yes i agree, it will never be a real subwoofer! But far east producers use 6.5" always... Like LG, Samsung, Philips etc.. As i hear they give satisfull performance (but not like a Harman Cardon). I need only LG like bass level not more! What do you think? If i install two of them as iso barik and in a 4th order bandpass (appx 30lt total) box can i hear 30hz?

 

[simon5]

If you want to hear 30 Hz, your best bet is mounting both drivers besides each other, not in a clamshell. You could go ported too to help these small drivers to reach 30 Hz with some authority.

 

[Dxvideo]

Do you mean that?;

http://sound.westhost.com/project1052.htm
(Pls look at the "Isobarik Woofer Mounting")

As i can understand this system has two volumes; one of them is between two speakers the other is the bass reflex box (the real one). Is it? I mean will i install the drivers in a little BOX with the same way? (As shown in figure)

And my speakers are 4ohm so i cannot connect them in parallel! Can i connect them in serial (for 8ohm). Does it make difference?

In that case is 20lt box enough?

Thanks a lot for your helps..

 

[simon5]

Not at all, I want you to install both woofers like this :

__
...|
../.\
.|...|
..\./
../.\
.|...|
..\./
...|
¯¯
Both firing in the same direction, one above the other.
If you want to go with isobaric, then the first design is better, the second design you posted is not good, thermal problems and worse air coupling.

 

[Dxvideo]

Sorry i cannot understand anything from your drawing! May you draw a detailed something? Or may you give a link pls.

Thanks a lot.

BR

 

[simon5]

Here is another drawing...

Put both woofers, both on the front baffle.

 

[Dxvideo]

I already have a box like that! And tried both my speakers on it! And the result was TERRIBLE! Do you think iso barik (piggy back) methode is not suit for me?

 

[simon5]

Well, try it! You will lose some SPL on the other hand. You won't be able to play 30 Hz very loud.

Try it, you have nothing to lose, it might work better than I expect hehe!