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Old 9th March 2013, 01:18 PM   #1
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Default SBS18

Serial Bandpass Subwoofer with 18 inch EVX180B driver.
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Old 9th March 2013, 03:00 PM   #2
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I thought this was an SBS (systems by shorty) thread...
Anyway what's your point? The EV driver is expensive for what it is, and your design shows no details....do you want to build this?
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Old 12th March 2013, 12:55 AM   #3
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Quote:
Originally Posted by m R g S r View Post
I thought this was an SBS (systems by shorty) thread...
Anyway what's your point? The EV driver is expensive for what it is, and your design shows no details....do you want to build this?
I like sound of Dynacord PWH18 subwoofer and I want to DIY similar box.
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Last edited by apexaudio; 12th March 2013 at 01:03 AM.
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Old 12th March 2013, 01:03 AM   #4
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Isn't the driver $500usd or So?
Do you have the drivers already? If not...I think that $500 will get you much further with a B&C or 18sound driver in a TH-18 or keystone....just my 2cents.
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Old 12th March 2013, 01:07 AM   #5
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Quote:
Originally Posted by m R g S r View Post
Isn't the driver $500usd or So?
Do you have the drivers already? If not...I think that $500 will get you much further with a B&C or 18sound driver in a TH-18 or keystone....just my 2cents.
Yes I have 4 EV drivers replaced with B&C 18TBX100 in bass reflex.
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Old 12th March 2013, 01:18 AM   #6
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I've heard the dynacord cobras on multiple occasions, wasnt really impressed by them. But hey if you liked them go for it!

They're -10db at 30hz...so I'm guessing you don't care to dig that low with these? Or do you have some other sort of subwoofer to compliment these?
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Old 12th March 2013, 09:14 AM   #7
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Quote:
Originally Posted by m R g S r View Post
I've heard the dynacord cobras on multiple occasions, wasnt really impressed by them. But hey if you liked them go for it!

They're -10db at 30hz...so I'm guessing you don't care to dig that low with these? Or do you have some other sort of subwoofer to compliment these?
I have 2 cobra subs, but FX20 is not same as PWH18.
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Old 14th March 2013, 08:00 PM   #8
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Today this sub was shaking my house
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Old 15th March 2013, 10:07 AM   #9
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I change port, now is 150x100mm
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Old 17th March 2013, 06:42 AM   #10
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That's what is called a 'planar wave horn' at another forum.

The front stub adds gain peaking at its 1/4W length frequency.

The Klasko patent (expired) gives us some better ideas as far as multiple drivers and wasted space around the 1/4W stub. The area of the 1/4w stub need not be as large as the Sd of the driver (s), 70%~80% should work well.

Patent US5313525 - Acoustic apparatus with secondary quarterwave resonator - Google Patents
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Last edited by djk; 17th March 2013 at 06:46 AM.
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