30 HZ from a 10 X 7 box

[fwbutler]

The idea has merit and I have been looking. Can't find a tweeter that has an fs low enough that 2 X fs is under 1k
Finding a full range that does not require a large chunk of my tiny box and will handle at least 8 watts + goes up to 20k has been hard but did find a few
TB W1-1942s
TBw2-852sh !
TB W251743s
With a Vas of .005 small enough section of the enclosure
8 watts
good to 20k
low fs
and under $25
If i keep looking I,ll find the perfect one. If anyone has ideas chime in.

You guys have sent me digging for info and specs on every post, it's great!

 

[fwbutler]

I like the Tang Band W2-803SM does anyone have experience with this full range?

 

[lemans23]

I have used it, and being a huge TB fan, it was honestly wasn't bad. I actually used it as a full range small monitor for my keyboard and it was just okay. I would say, however, that when you push it, you will know that it's a 2" speaker. It's not going to sound effortless at the listening volumes that you're interested in.

 

[jReave]

The W5 is a great little driver but be aware that to reach as low as it does, it needs a fairly long port which of course you have to add to Vb. In a 9L box tuned to 35Hz, and limiting the port diameter to 4.5cm (1.77"), you need a port length of 42.75cm (16.83") so add about another litre to Vb. You'll need to right angle the port to fit in your box size too.

Port resonance can be a bit of a problem with this driver too if you want to use it as something more than a subwoofer. The smaller the port diameter here the better but then the trade-off is that port noise might be an issue at higher SPL's. Graphs below show the FR with the 1st resonance blip just above 400Hz and then the port air speed at 15W giving about 92dB. Both are probably acceptable for your intended purposes but you need to choose Vb, Fb and port diameter carefully. Analysis is with Unibox btw.

Also I don't think you can beat the little Vifa full range drivers for quality and price.
Vifa TC9FD-18-08 3-1/2" Full Range Paper Cone Woofer 264-1062
Vifa TC7FD00-04 2-1/2" Full Range Paper Cone Driver 4 Ohm 264-1144
Vifa TC6FD00-04 2" Full Range Paper Cone Woofer 4 Ohm 264-1126

You can find Zaph's measurements of all of these on his blog page, Zaph|Audio

 

[weltersys]

If anyone has ideas chime in.

The JAMO 30466/30462 2-1/2" X 4" Shielded Speakers I used for this project are dirt cheap, sounds OK, and would fit, using a small back chamber:

http://www.diyaudio.com/forums/multi-way/236037-dirty-dozen-line-array.html

You can see actual frequency response in the post, dispersion was surprisingly good.

 

[fwbutler]

The Tang Band W2 803SM is to replace the tweeter so the 1138 can be crossed over at 500-1K

 

[fwbutler]

the JAMO 30466 does not go high enough to replace the tweeter, only 10,500

 

[kelticwizard]

Also I don't think you can beat the little Vifa full range drivers for quality and price.
Vifa TC9FD-18-08 3-1/2" Full Range Paper Cone Woofer 264-1062
Vifa TC7FD00-04 2-1/2" Full Range Paper Cone Driver 4 Ohm 264-1144
Vifa TC6FD00-04 2" Full Range Paper Cone Woofer 4 Ohm 264-1126

You can find Zaph's measurements of all of these on his blog page, Zaph|Audio

That last little Vifa 2 inch goes above 15KHz straight ahead, and not bad at 30° off axis either. Not as good dispersion as a dome above 5KHz, but not bad. Off axis highs seem to be more important to classical listeners than popular music, and these are for your grandkids.

 

[fwbutler]

I have been looking at the Vifa TC 6 & 7 both are good. The 7 is 20 Watts 82 db per 1 watt
Looks good so far,

 

[fwbutler]

Here is what the TC7FD00 looks like

 

[mondogenerator]

I use both TB W2 800SL and TB W3 1285SG for mid tweeters. The W2 is able to use a particularly small volume, 30cc, and should be fine from 500hz upwards with a suitable hipass helping out.

 

[weltersys]

the JAMO 30466 does not go high enough to replace the tweeter, only 10,500

You evidently did not look at the actual measured response I posted, it is only -3 dB at 16,000 Hz.

The chart below shows the response measured at 12 inches, a rag tucked behind the speaker, three different units.

The link in the prior post also has the off axis dispersion of the line, a single would be the same horizontal dispersion but would not have the extra low end that multiples provide.

There certainly are better speakers available, but not for less than one dollar.

 

[fwbutler]

Here is a comparison of two of the (many) suggested full range speakers to replace the tweeter for a lower (500-750Hz) crossover of the Tang band W5-1138SMF subwoofer in a .25 ft^3 box. The full range driver will be in a small enclosue internal to the main enclosure.

The Vifa TC7 is rated for 20 Watts but cannot handle 6 Watts.

The Tang Band W2-803SM, rated for 8 watts, and is OK for 90 db at 8 Watts, in a small 10 in^3 internal enclosure. The chrome phase plug makes it look hi-tech and should help reduce distortion.

I am having trouble finding information on acoustic phase. not the Inductive / Capacitive, lead-lag but the 3db phase of the speaker. Does anyone have a good referance? Vance Dickason in the Cookbook mentions it but does not explain it.

 

[dumptruck]

You mean the phase shift inherent to natural rolloff of the driver (in the enclosure)?

 

[fwbutler]

weltersys,
I agree not for a dollar. A second project is for the younger kids to build some (good) speakers themselves, that may get destroyed in the building, Screwdriver through the cone these would be perfect. Thanks

If I do my home-work the Kids will use these for many-many years. I want the 20k upper response for the older grand kids. I am trying to learn about off axis phase

 

[fwbutler]

dumptruck,
from Vance-loudspeaker Cookbook,Talking about the "Q"[Qtc], As the Q changes..."the whole spectrum of changes occur"..."the phase angle at the -3db frequency" is he talking about the radiation angle narrowing?

 

[dumptruck]

I have that book, but I'm about to run at the moment. He's probably talking about the electrical phase angle at the -3dB on-axis response frequency. Even if not and he's talking about acoustic phase, it would not have anything to do with radiation angle. "Phase angle", electrical or acoustic, means "angle" as in "phase = -30°".

 

[fwbutler]

dumptruck, thanks
it's in section 1.38 in the forth edition

 

[fwbutler]

jReave,
Thanks for the input on the 1138

 

[dumptruck]

dumptruck, thanks it's in section 1.38 in the forth edition

He's talking about acoustic phase, as shown in fig 1.2 (or it's 1.2 in the 7th edition, the section you're talking about is 1.35 in mine, so it might be different), and the -3dB point in on-axis response. He's mainly just trying to point out that the Q, phase, response, and -3dB rolloff frequency are all directly tied together.