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Old 14th April 2004, 09:31 PM   #1
stifa is offline stifa  Yugoslavia
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Default Bad SUBWOOFER performance/A lot of air is trying to come out/thumps, PLEASE ADVISE...

Hi , I bought a multimedia speaker set for my PC, and the subwoofer performs quite bad. It delivers some sort of wOOOOMMMM sound like there is too much air trying to come out sor something..., it also doesnt go so low in Freq.

SO...
Before trying this with a real 2000$ Theater system when I get money like you lucky people I would like to Practice and make a better sound by modifying this low-end sub.

System is of Creative, and Subwoofer driver is "Cambridge soundworks" 30watt. I was thinking of applying damping material inside(there is none) ,OR building a new chasis for it to eliminate that "too much air" sound, possibly with a new port tube??.

IF tere are any other ways to MAKE SOUND BETTER AND TO LOWER THE FREQUENCY RESPONSE OF THE SUB, or if you know what should I do PLEASE SAY MAN!!!!

Also If you know/have any chematics of building the same based on experience PLEASE SAY MAN!!!
Thanks
MARKO )
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Old 15th April 2004, 01:02 AM   #2
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No matter what, you won't be able to get deep bass from that small of a driver.

But in your case, I think the worst things are too small of an enclosure and too high of a tuning point.
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Old 15th April 2004, 02:26 AM   #3
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It would help us if you are able to provide a product link to the speakers you are talking about.

Futhermore, the driver is prob. too small to achieve any decent bottom end. From memory, creative subs use 6" drivers at the most. You may only reach 45hz (-3db) if your lucky (assuming you get a bigger box and retune it).
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Old 15th April 2004, 02:54 AM   #4
tktran is offline tktran  Australia
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I had a Cambridge Soundworks FPS1600. Used a cheap 5" midbass, and they call it a "subwoofer".

Ridiculously boomy and to top it off I could hear air squirting out of the port.

Thinking it was due to a crap driver I replaced it with a Vifa P13. Sounded exactly the same. I concluded it must be due to EQ to give the impression of bass. But like many other computer speakers using cheap 5-8" drivers it has no real bass.

The port resonance did not help and made things worse. In the end I plugged the port with none other than tissue paper.

You could also try a sock.

Damped the boomy peak and the whooshing sound was gone. Hardly hifi, but at least prevented me from throwing it out for curbside garbage collection.
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Old 15th April 2004, 04:13 AM   #5
jonz is offline jonz  Canada
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I bought my daughter a cheap $100 dollar subwoofer(for her PC) with two sattelites....on the box it says 110 watts......but for the life of me this thing rocks.....the ornaments fell off the shelves in her room.....I have never seen a 100 watt 10 inch driver put out so much bass....actually it's called Cyber Acoustics speaker system.

Click the image to open in full size.
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Old 15th April 2004, 05:26 AM   #6
sam9 is offline sam9  United States
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Most "Multimedia" speaker systems are from an audiophile point a view a farce. You might look at Eminant Technologies or at Monsoon.

I'm afraid the CSW is not what it used to be noe that Henry Kloss is gone.
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Old 15th April 2004, 06:39 AM   #7
sreten is online now sreten  United Kingdom
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Default Re: Bad SUBWOOFER performance/A lot of air is trying to come out/thumps, PLEASE ADVISE...

Quote:
Originally posted by stifa
System is of Creative, and Subwoofer driver is "Cambridge soundworks" 30watt. I was thinking of applying damping material inside(there is none) ,OR building a new chasis for it to eliminate that "too much air" sound, possibly with a new port tube??.

IF tere are any other ways to MAKE SOUND BETTER AND TO LOWER THE FREQUENCY RESPONSE OF THE SUB, or if you know what should I do PLEASE SAY MAN!!!!

MARKO )
Foam lining the subwoofer will help in terms of sound quality,
for a normal reflexed subwoofer complete stuffing is not good.

If the port is external and its not a bandpass design :

(If it is a bandpass stuff the sealed section with BAF /
Polyfill and line the reflexed section with acoustic foam)

Two choices to lower the port frequency -

Line the port with foam ; you need a piece the length of the port
x 3 times the diameter. Thickness depends on the diameter of
the port, for a 1.5" port 1/4" foam is good.

Lengthen the port ; if there is plently of space behind the end
of the port fill it with the larger style plastic drinking straws
and let them stick out to extend the length. You'll need to
be able to increase length by at least 50% ideally nearer 100%
and still have enough airspace at the end of the port for it to
be able to "breathe". If you haven't enough space behind the
end of the port go with the foam lining.

If all else fails, stuff it if with BAF and block the port, but foam
lining of the box and retuning the port should work far better.

sreten.
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Old 15th April 2004, 07:04 AM   #8
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yeah the cyber acoustics do have some bass, it doesnt go that deep, but it isnt bad for their price.


I have a midiland set with a 6.5" sub. Small but it goes to at least 35hz.. havent really tested it. The box seems to be designed well.

Model is 8200

Driver brand is "Audiophile"
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Old 15th April 2004, 08:05 AM   #9
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hi

i have given a solid competition of these chinese drivers for muti media spk manufactureres in india

there are quite a few problems

since i develop transducers my stuff totally out - did the chinese
drivers (even in pricing !)

but i dont think it will be possible to fit better drivers for every one here

then a course of action could be

to detemine any enclosure resonances and totally cancel them out by rein forcing the structure , the enclosure should be rock solid

now check out the driver and detemine if it can be driven by better electronics if can be - pull out a line of the driver and run it thru a 30 to 40 watt amp and see how it performs

if it plays better , change the tx of the sub unit (also monitor the tx temp while playing the sub normally many of the chinese spk s are under powered)

oh by the way creative , cambridge , jbl all are chinese stuff -

try to work out better electronics for the sub , also try out the other suggestions of fine tuning the porting

suranjan

transducer design engineer
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Old 15th April 2004, 12:37 PM   #10
BAM is offline BAM
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Isn't that bad? I heard that exact model (the Cyber Acoustics set with the ten) once and it was horrible! Never before have I heard such a boomy subwoofer! That sub probably doesn't go below 65 Hz.
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