ND105-8 = $9.99 (9/22 ONLY!) MTM for less than TM with -4?

[superspeeder]

The ND105-8 is on sale for $9.99 until Nov. 15th.

What do you experienced folks think of the 8 ohm version versus the 4 ohm? I know the four has had its share of the spotlight since the series was introduced, is this simply because of its impedance or are there other considerations as well?

[bmaupin]

The 105-4 was on sale earlier this year for $12. The -4 does model better in the same box.

[Chris Roemer]

The 105-4 was on sale earlier this year for $12. The -4 does model better in the same box.

I haven't measured the 105-8.

I like the 105-4 over ALL the other small ND woofers because it has the lowest Qts (I measured 0.48 IIRC) making it the best for use in a ported box, but $10 is AWFUL cheap.

Using WinISD (Pro - alpha), I like the -8 in 0.40 cf, tuned to near 41 Hz with a 1.5"d x 6" long vent. Rear venting is best. The box is a bit bigger than what I've used for the -4, but the -8 should actually reach a little lower. I get an F3 of around 36 Hz. This should be able to take 20-25w below 40Hz w/out bottoming out.

You can put an ND105-8 MtM in a 0.75 cf (PE?) box.
Use a 2"d x 5" long rear vent. Fb = 42, F3 = 36.

HP for ND20FA-6 (positive polarity):
5.6uF series cap, followed by a #20 0.15mH shunt coil (to gnd).
L-pad: 3 ohm series resistor, 3 ohm parallel

Low pass for 2 105-8s in parallel:
#18 0.55mH series coil.
Zobel with a 2 ohm resistor and a 4.7uF cap.

Around 85dB +/-2dB with about 2-3dB of baffle step. Fc at 4.3 kHz.
Very solid 4 ohm design. Bass minima of 4.1n from 200-250 Hz.
9n @ 2.5k, tweeter minima of 3.6n around 8k.

Chris

[johnnyrichards]

These little guys are very good demonstration of Hoffman's law. 0.75 cubic feet for a pair 4" woofers :)

The price, however, is very nice and I would think the MTM approach should give a very satisfying near field bass experience.

[Chris Roemer]

These little guys are very good demonstration of Hoffman's law. 0.75 cubic feet for a pair 4" woofers :)

The price, however, is very nice and I would think the MTM approach should give a very satisfying near field bass experience.

Even though they have a humongoid Xlim of +/-10mm, I use 6mm for Xmax when modeling, but let them approach 8mm in the extreme. They've got the output of a 6-1/2" Classic, and aside from sensitivity issues, the MtM should be the equivalent of an 8" 2-way (not reaching QUITE as low, but in a box half the size) or the Venerable Dayton D-III (but reaching lower in about the same volume). From the Dayton graphs, these ARE a tad "rough" through the passband though, like +/- 3dB.

Chris

[mintos]

These little guys are very good demonstration of Hoffman's law. 0.75 cubic feet for a pair 4" woofers :)

The price, however, is very nice and I would think the MTM approach should give a very satisfying near field bass experience.

Yeah, .75 cu ft is too big for 4"...I would be happy for these to just go down to mid 50hzs.

[richt@daytonaudio.com]

I have to apologize, the pricing at $9.99 per driver was a data entry error and the ND105-8 will be adjusted tomorrow to the $19/driver that was supposed to be entered. We will be leaving the $9.99 up for the rest of the day, so ORDER THEM UP (http://www.parts-express.com/pe/showdetl.cfm?Partnumber=290-214) before the price is adjusted!!!!!!

[mintos]

WOW... thx! That's got to be the best marketing ever. Just bought 10. I wasn't going to buy before, but I would be an idiot not to buy some now. I bought 12 ND105-4s before, but I sold 4 for my friend to upgrade his car.

hmm...10 ND105-8 and 8 ND105-4, what to do with them now...

[Pete00t]

WOW... thx! That's got to be the best marketing ever. Just bought 10. I wasn't going to buy before, but I would be an idiot not to buy some now. I bought 12 ND105-4s before, but I sold 4 for my friend to upgrade his car.

hmm...10 ND105-8 and 8 ND105-4, what to do with them now...

Ten! lucky you. The wife only gave me approval for four.

[mintos]

wanted free shipping...

[kmibb]

wanted free shipping...

sucker!