Can someone graph this sub possibly vs the rsd 10

Mackenzie · Post by **Mackenzie** » Thu Jun 19, 2008 5:35 pm

http://www.nkmca.com/auto/subwoofer/sp_w104s_specs.htm

Diameter: 10"
254mm

Sensitivity: 88.7dB

Power Handling:

Watts RMS: 250 Watts

Watts Peak: 400 Watts

Frequency Response: 25Hz-500Hz

Nominal Impedance: 4 Ohms

Cone Material: Polypropylene

Basket Material: Steel

Surround Material: 2" Rubber

Spider Material: Poly/Cotton

Magnet Weight: 100oz.

Voice Coil: Single

Free-Air Resonance (Fs): 25.612Hz

Mechanical Dampening (Qms): 4.409

Electrical Dampening (Qes): .335

Total System Dampening (Qts): .312

Voice Coil DC Resistance (Re): 3.2 Ohms

Equivalent Acoustic Volume (Vas): 75.656 Liters

Effective Diaphragm Area (Sd): 33.006 sq. meter

Linear Coil Excursion (Xmax): 10.5mm

Half Space Output Level (SPL): 88.7dB

Energy Bandwidth Product (EBP): 76.45

Mass of the Moving System (Mms): 79.163 grams

Post by **stipud** » Thu Jun 19, 2008 6:19 pm

Good find! That sub looks eerily similar! Same basket and everything

KHPower · Post by **KHPower** » Thu Jun 19, 2008 7:22 pm

If my BassBox software will work I can check it out

Any boxes you want to try them in?

Mackenzie · Post by **Mackenzie** » Thu Jun 19, 2008 9:22 pm

I will be running them ported, but you can graph them in both boxes if you can..

Mackenzie · Post by **Mackenzie** » Thu Jun 19, 2008 9:26 pm

stipud wrote:Good find! That sub looks eerily similar! Same basket and everything

It seems to have decent specs aswell. For the price these things are going for on ebay, I dont think I can pass them up. I was mainly trying to see what they graphed like on the low end, but I think they will do well.

Not exactly the best store to buy them from, but you get my drift on the prcing.. Im really debating hard on buying 6 of these things..

http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... =p3907.m29

KHPower · Post by **KHPower** » Thu Jun 19, 2008 10:10 pm

I may need a exact box sixe and tuning you are after. I couldnt find any box info on the subs site. Let me know

KHPower · Post by **KHPower** » Fri Jun 20, 2008 6:25 am

On a side note , after entering all of the parameters for the Nakamich. bassbox has a slider bar that leans either to the right or left to indicate what enclosure is best for a particular sub , right being ported and left being sealed and the bar is a touch over half towards a vented but it looks like it will do equally good in a sealed because the bar is almost base line in the middle.

Mackenzie · Post by **Mackenzie** » Fri Jun 20, 2008 7:37 am

hmm try 1.25 ported. I dont see any box specs either.

Post by **stipud** » Fri Jun 20, 2008 7:59 am

Well, while they look the same, but appear to be quite different. The Nak gave up low frequency output in exchange for efficiency. It shouldn't sound nearly as good on deep bass as the RSD does, but it should be louder.

First I graphed them free air, so you can see their natural reponse curves.

Then I went with BBX's recommended "high fidelity" ported enclosures...
RSD: 1.65cuft @ 23Hz
NAK: 1cuft @ 30Hz

Tuning the Nak any lower would make it boomy, while the RSD could easily handle tuning below 20Hz

Mackenzie · Post by **Mackenzie** » Fri Jun 20, 2008 8:28 am

Looks interesting.. Definately worth a shot.. Not that Ide ever tune any car box lower than 30 hertz anyways, as its not needed.

I wonder why these things are going so cheap. Might be a gem for all we know..

KHPower · Post by **KHPower** » Fri Jun 20, 2008 8:40 am

Good thing Stipud got it right

I had some box hitting in the 140's

I wonder where I messed up , or did I ?????

Post by **stipud** » Fri Jun 20, 2008 9:35 am

KHPower wrote:Good thing Stipud got it right I had some box hitting in the 140's I wonder where I messed up , or did I ?????

My custom amplitude graph is rated at 500w, perhaps yours was at 5000?