8" Woofer Help


2005-08-30 4:19 am
8" Woofer Help

Hello all.

Hear is my situation, i came accros some klipsch SP-1 drivers about 5 years ago for free, so i made some boxes for them. The box size is 43" x 10" x 13.5". Tweeter is a compression with a 4 1/2" horn. Midrange is a 6.5 inch driver in its own sealed space measuring 10.5" x 9" x 12.5" internal volume. Woofer is a 8" that is in a 22" x 9" x 12.5", it has a 4" port, and is powered by a plate amp, just like the original klipsch design.

The boxes turned out very good for a first attempt, and the overall sound is good. But the woofers just cant handle near as much volume as the tweeter and mids, the woofers tend to over extend during heavy use or deep bass.

So i would like to know if you would have a recomendation for a good 8" woofer that could handle some more bass?

Klipsch refers to the 8" as a subwoofer, but it looks to be a normal woofer to me, at least compared to my Subwoofer, so maybe a 8" subwoofer?

Very much a audio novice so any help would be appreciated.

Thanks Pete


2005-08-30 4:19 am
I had looked at that speaker this afternoon, not sure where to buy them?

I was wondering about this speaker, http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=264-838 it would fit in my box, but not sure if i have enough volume inside to support it.

I know this may sound stupid, but could i use a car 8" inch woofer? Seems to be alot better selection of actual subwoofers for cars. The problem with them is they are a little on the flashy side.

If car woofer would work how about something like this, http://www.sonicelectronix.com/item_2771.html ?

This speaker calls for a box size of around 1 cubic foot, i have a little more, but might work?

Don't everyone laugh to hard at the car woofer suggestion.:eek:


2005-08-30 4:19 am
Yes there are plate amps all ready, i have been using these speakers for 5 years. The woofers have gotten worse over time because they have been over extended a few to many times.

Rob the woofers do ok, but this system is used for Home Theater for the most part and the woofers just cant handle those action scenes. When ever a big bass segment of a movie comes up they will fall flat on there face. This system is run by a Marantz SR7000 reciever, and has Klipsch center, rear and seperate sub. The problem is that the 8" woofers in the main speakers will flutter and make the movie sound like crap during heavy bass scenes.

I listen to music on my Kef's, i just want to get this system up to par for the family. Hate having the wife say what is that noise?
Sneakypete said:
I had looked at that speaker this afternoon, not sure where to buy them?

Can't help. My purchases were in Canada. Try googling tang band

I was wondering about this speaker, http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=264-838 it would fit in my box[/B]

That's epitrochoidal shape. Isn't yours 8" round?

could i use a car 8" inch woofer? [/B]

yes but most often they are designed to fill a car's cavity, not a room's, I'd stick with the home audio units.


2004-10-19 4:29 pm
Ok, here goes. your speaker is 94 db.
The original specs are here.

# ENCLOSURE TYPE: Sealed (mid/tweeter) / Bass reflex via rear-mounted port (subwoofer)Ported bass
# DRIVE COMPONENTS: Three-way sytem using one 1" (2.54cm) magnetically shielded, neodymium magnet, aluminum dome compression driver tweeter with a 5" (12.7cm) square 90ºx60º Tractrix® Horn, one 5.25" (16.5cm) magnetically shielded, IMG cone midBass driver and one 8" (20.32cm) magnetically shielded, fiber-composite cone subwoofer
# TWEETER: K-101-S 1" (2.54cm) Aluminum dome compression driver
# HIGH FREQUENCY HORN: 5" square 90ºx60º Tractrix® Horn
# MIDRANGE: K-1076-SV 5.25" (13.34cm) IMG cone / cast polymer frame
# SUBWOOFER: K-1077-SB 8" (20.32cm) Fiber-composite cone / cast polymer frame
# SUBWOOFER AMPLIFIER: Peak output power 225 watts into 4 ohms
# DIMENSIONS (H x W x D): 37" (93.98cm) x 9" (22.86cm) x 14" (35.56cm)
# WEIGHT: 47 lbs. (21.36kg)
# ENCLOSURE MATERIAL: Medium density fiberboard construction (MDF)
# FINISHES: Black ash vinyl veneer

You made new boxes????
Look here for the correct sizes and specs.
It may be that your port is the wrong size and it's unloading at a higher frequency, but then all ported speakers suffer from this.

Scroll down this web site and see a pretty animation on speaker unloading.

The only way a ported box won't unload is if you build a dual-chambered box;

To correctly tune your port we'll need the T/S parameters on that woofer.
If you are looking to replace that woofer you'll have to find one that's 94 db. That probably means a Pro- Sound woofer.
Something similsr to above.
That still won't cure the problem of unloading at low frequency that movies or some music can produce.
I would start all over again and make a correct HT speaker system.
Especially the woofer part.


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