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Old 2nd April 2003, 08:10 AM   #1
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Default Good BASS drivers at partsexpress ?

Hi,

I am looking for some good BASS drivers with deep clean tight bass and good resolution. I am looking at 5" -7 " drivers siutable for bass-reflex alignment with box size of less than 1 cu feet.
Looks like these are some good drivers. Can anyone comment on these. These will be used with 3"full range Tang Band drivers available at PartsExpress and will mostly be used for listening to FM

First is Part Number 299-706

http://www.partsexpress.com/pe/showd...D=117849&DID=7

Really cannot believe the price of the above one. Sounds too good to be true, is there some catch here. Can really put multiple drivers at this price

Second is Part Number 295-300

http://www.partsexpress.com/pe/pshow...number=295-300

Third is Part Number 295-305

http://www.partsexpress.com/pe/showd..._ID=7769&DID=7

Also if someone could suggest how to model multiple drivers (Firstly with two separate drivers in a vented box so that the area is doubled and second with both drivers in push pull mode). What will I achieve with these two configurations?

Thanks in advance
Goldy
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Old 2nd April 2003, 12:57 PM   #2
OMNIFEX is offline OMNIFEX  Jamaica
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Hi Yourself!

I'm no expert on baby woofers (Ask me about 15, 18, 21, & 24's ) but, I will give you my $0.02


Either one you can't go wrong. The SPL's are the same (1 dB is difference is nothing) The QTS is good for a Reflex design.
So, the only thing left is choose the right drivers, for your
desired, size, enclosure(s)


You'll need a modeling program to achieve optimum results.
(Using multiple drivers in one enclosure)
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Old 2nd April 2003, 01:12 PM   #3
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Check out this link - looks like some good in-depth advice on using the TangBand 3 inch drivers.

http://home.new.rr.com/zaph/audio/audio-speaker11.html

Here's an excerpt:

"Note that the W3-871 is NOT the same as the 3" Tangband drivers available at Parts Express, it is largely improved due to the polymer damping coating on the cone. "

I'd definitely look into using the improved driver.

Also check out this Tang Band 8 inch woofer for $31:

http://www.tb-speaker.com/detail/0116/W8-740C.htm

It has dramatically better low frequency reach, XMax and power handling than the PE driver. Can't personally vouch for it's quality.

Available at:

http://www.nuera-acoustic.ca/

Good luck!
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Old 2nd April 2003, 05:04 PM   #4
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Quote:
Really cannot believe the price of the above one. Sounds too good to be true, is there some catch here. Can really put multiple drivers at this price
Looked good to me! Thanks for the link- I just bought 8 of them!
Steve
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Old 2nd April 2003, 05:26 PM   #5
RAW is offline RAW  Canada
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Just not the coating on the 871S.
It a complete different driver over the 879S
Different
PHASE PLUG-wider and longer on the 879S
Cone is 100% different_different cone angle over the 871S
Different Spyder over the 871S the 879S has5 rung spyder and the 871S has 4.

Look at my DIY site and you will see the difference on them.

http://quicksitebuilder.cnet.com/wrn...eakerbuilding/

And the 8" sub from TB the MCM for less money is just the same out put.
55-2421 from MCM over the TB W8-740C
I will have the Quatro soon to do a test using it in the same cabinet as the TB,MCM
Sealed,ported,Single PR the twin PR.
But as it stands now the TB and MCM will hit the 20HZ range but need the RCM pr to do it.I have found no other way to get that low with these drivers other than the RCM PR.
The MCM prs are 8mm and the RCM 50mm.So if you use the MCM pr you will need to start with 4 of them.
And the MCM has no way to add mass.
As the RCM has the screw with a nut to add mass.

Just my cents on these.


And CSS sells the 871S and very good customer service as well.
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Old 3rd April 2003, 02:32 AM   #6
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Yeah, the one you ordered should get you some nice bass, especially with 8 of them. If you want, look into adding some mass to them to get them to go lower, since you will have plenty of efficency with all 8. I am assuming that you are using them for just bass of course.

-Paul Hilgeman
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Old 3rd April 2003, 01:27 PM   #7
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Quote:
Originally posted by PaulHilgeman
Yeah, the one you ordered should get you some nice bass, especially with 8 of them. If you want, look into adding some mass to them to get them to go lower, since you will have plenty of efficency with all 8. I am assuming that you are using them for just bass of course.

-Paul Hilgeman
I assume you were refering to me... (sometimes it gets a little confusing). I was actually planning on building a set of MMTMM's out of them. Series-parallel to keep a 4 ohm impedance. Maybe with the Vifa XT ring tweeter.
I can't believe that these things are only about $6 a piece! Cast frame, 70W, decent response... It's a nice driver for the price!
Right now for bass I am using a sub with 8- 8" MCM 55-1190 woofers in a large sealed enclosure with a 250 watt amp. The sound is pretty good- definitely clean at reasonable to fairly loud levels, and you can't beat the price on those drivers- about $12 a piece in 4 or more quantity.
Anyway, I'm not trying to take over the thread...
Good luck on your search, Goldy. Let us know what you come up with.
Steve
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Old 3rd April 2003, 02:32 PM   #8
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Raw

Many thanks for your input.
If I am understanding your post you are saying:

1.) The MCM 55-2421 is superior to the TB W8-740C

2.) Use the RCM passive radiator with these drivers

Have you tested this design. If so what was the quality???

thanks
<peter>
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Old 3rd April 2003, 02:38 PM   #9
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Default But how do I model multiple drivers ?

I will go with the parts express ones. But how do I model both the drivers. I will be looking at both the configurations

a) Push Pull with each driven by TDA1514 and
b) Both in parallel (not electrically but acoustically) again both

driven by TDA1514 each. I believe the resulting specs in both configurations are going to differ, but how do i calculate the resulting parameters. Any free modelling utilities. Please name them

Thanks In Advance
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Old 3rd April 2003, 04:39 PM   #10
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Use Unibox found at:
http://www.pvconsultants.com/audio/frdgroup.htm

It works well, enter the parameters found at PE's site (I have done measurements of mine, and they come out very similar) Select 2 drivers in parallel. You should try a box volume of about 20L and a tuning frequency of 50Hz. This should get you some darn good bass out of 5" drivers.

Drive them with the same amplifier, in electrical phase with eachother.

-Paul
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