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Old 2nd November 2006, 12:04 PM   #1
mwb is offline mwb  United States
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Default Sub design assistance needed

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My 15 year old son has purchased two 10" Subwoofers, for installing into his 1994 Thunderbird with the following spec.

power -1000 watts max
voice coil= 2"
znom= 4 ohms
Fs= 26.9 Hz
SPL= 83.5 dB 2.83v/1m
Vas= 2.39 cu ft.
Qms= 5.23
Qes= .89
Qts= .76
Dual voice coil
Diminsions: A= 10.16", B= 9.69", C= 6.8"

My question is can someone with more knowledge than I help direct us to a proper box design,for this application, as oppose to him just buying whatever box has clear covers with neon lights.

Thanks for the help
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Old 2nd November 2006, 12:10 PM   #2
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They will need to be in a sealed box of at least 2 cu ft each. Unfortunately Qts is very high, makeing the box big but at least it will go a little deeper. As Qts is so high there will always be some peaking in response. They are not suited to a vented box.

The real power rating of them is probably more like 250 watts RMS.
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Old 2nd November 2006, 03:43 PM   #3
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What kind of speakers are they?

Those would work in IB. How big is the rear deck on that t-bird?
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Old 3rd November 2006, 01:58 AM   #4
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I've tried modeling them with winisd pro (with cabin gain) and all i can say is throw them out, yuch.
they are just revolting, nothing I do seems to make them look any good, to get anything close your looking at a sealed 50ltr MINIMUM each.

Good for loose sloppy boom and even thats being generous.

Sorry but your son has just wasted $10........
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Old 3rd November 2006, 03:44 AM   #5
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Default Subwoofers...

After some number crunching my calculator has given some way out of reason numbers....These drivers seem to have been engineered out of range of what would be considered "High-fidelity"...as a result I cannot seem to get any rational numbers for it.
Reverting to rule-of-thumb I'd say one large box of one inch thick medium density pressboard....48 inches long, eighteen inches deep, twelve inches high. Divide in half with a partition, two inch long screws every five and a half inches with a good wood glue, stuff it with a cotton batting (Easily found at a fabric store).
Find a car stereo place to put this "box carpet" over it...find some 10 inch "industrial" grills, a terminal box (Four total)....drop the drivers in it somewhat off-center onto the completed box, wire it up & your done!
___________________________________Rick...........
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Old 6th November 2006, 12:28 AM   #6
mwb is offline mwb  United States
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Default one more question

what if i where to butt these up against each other in the push pull type configuration, does this make the enclosure much smaller.

also the deck of the tbird is large enough to hold these without an enclosure, is that best suited for these

last

www.pyleaudio.com show these in almost normal size boxes, these items are huge and heavy, its hard to believe they are so off. is any of these they show worth while to copy??

Series Blue Label
Model PLBN102
Brand Pyle
Category Subwoofer Enclosures
MSRP $210.90
Warranty 1 Year
Item Manual PLBN102 Click Here


--------------------------------------------------------------------------------

PRODUCT INFO

Detail

Two 10'' High Power 4 Ohm Subwoofers
Silver Polypropylene Cone
Specially Treated Black Rubber Edge Suspension
2'' Aluminum Voice Coil
Bandpass Alignment for Extra Deep Bass
Plexi Glass Front Window
Blue LED Woofer Rings
4 Tuned Ports
1000 Watts Max Power Handling
Dimensions: 30''W x 13.6''H x 14.8''D
Dual 10'' 1000 Watt Bandpass System w/Neon Woofer Silhouette

Series Blue Wave
Model PLBWS210
Brand Pyle
Category Subwoofer Enclosures
MSRP $195.70
Warranty 1 Year
Item Manual PLBWS210 Click Here


--------------------------------------------------------------------------------

PRODUCT INFO

Detail

Two 10'' High Power 4 Ohm Subwoofers
Blue Neon Silhouette Woofer Rings
Silver Polypropylene Cones
Specially Treated Rubber Egde Suspension
2''Aluminum Voice Coil
Bandpass Alignment for Extra Deep Bass
Quick Connect Input Terminals
Plexiglass Front Window
1000 Watts Max Power Handling
2 Tuned Ports
Frequency Response: 35Hz-1k Hz
Dimensions: 13''H x 25.5''W x 14''D


Is throwing them out the only answer??
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Old 6th November 2006, 01:09 AM   #7
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Isobarik will help yes.
Were not saying they wont go boom boom, just that from a point of being 'enjoyable musical bass' they will be lacking.

Dont spose you can measure the theil/small rather than rely on the crud they supply ??

Might put them in a different light.

Will be a good learning experience for your son.
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Old 6th November 2006, 05:40 AM   #8
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Default Re: one more question

Quote:
Originally posted by mwb
also the deck of the tbird is large enough to hold these without an enclosure, is that best suited for these
That's what I would do.

So it's this one?:
http://www.partsexpress.com/pe/showd...number=292-135

Maybe they accidentally tested it with only one voice coil hooked up?
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Old 6th November 2006, 06:19 AM   #9
mwb is offline mwb  United States
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Default measurements

i will look into actually measuring these, give me a few days and i will get back to all

and thanks for all the assistance so far.

by the way
Is this company known for providing less than good speakers as well??
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Old 6th November 2006, 12:11 PM   #10
mwb is offline mwb  United States
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Default sub

Yes lothar34 that is exactly the woofer he bought.

I have emailed both pyle and parts-express, just in case the spec has a typo , but i will try and measure it.

thanks again for all the help here
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