[sqall12001]

 

[Mike P.]

Need a little more info. What sub is this and do you have a link to the T/S parameters? How big is the box and what is the tuning frequency in your modeling?

 

[sqall12001]

DHD power cruiser 15" (I have it sitting around)
Model #NTX-6415
15" All-Chrome Woofer
700 Watts Max
350 Watts RMS
4 Ohm Impedance
Rubber Surround
Kaptan Voice Coil
Screw Style Terminals
Frequency Response: 25-800
Sensitivity: 90 dB
Reve (DC VC Res) 3.3000
Fo (Res Freq) 27.6090
Zo (Zmax at FO) 34.5649 Ohm
SD (Piston Area) 0.0855 (Sqm)
BL (Flux* Length) 13.6834 (tm)
NO (Ref Effcny) 0.7948
SPL (SPL at 1w) 90.9852
QMS (Mech Q) 5.0364
QES (Elec Q) 0.6166
QTS (Total Q) 0.5491
VAS (Acous Vol) 140.9972 Litr
CMS (Compliance) 135.7323 (Um/n)
MMS (Total Mass) 173.1605 Grams
MMD (Diaphram Mass) 158.5444 Grams

It's at 13cu ft.
21Hz.
Anything below and it rolls off very quick and a poor dip also.

-Nick

 

[Mike P.]

Whether this sub is any good or not will depend on the Xmax. Any idea how much it has?

 

[sqall12001]

Gotta call Dhd mon about that. have had the sub for awhile and there are no specs out there pretty much

I hope they can get me the rest of specs.

Do you think it'll be a great ported system anyways.

From my audio exp. it seems like it should be great, but i'm fairly new to home audio.

-Nick

 

[Mike P.]

Did a search for this sub and found out it cost $48. A LLT requires the movement of lots of air ( high Xmax) and that won't happen with this sub. If you are interested in a LLT then I suggest you find a suitable driver fior the intended purpose. Depending on what the Xmax is, the NTX-6415 might be alright for a ported sub.

 

[sqall12001]

Wasn't expecting a whole lot of xmax 12mm maybe

-Nick

 

[SteveCallas]

That's not a LLT, it falls short of many of the requirements. It would just be a ported sub. I would lower the tune a bit.

 

[thxgoon]

Ya but with 12mm of xmax I'm not sure how much good that would do him. Personally for a ported sub I think it looks pretty good. As you say response drops like a rock under 20hz but it's nice and flat until 20. I wonder why the manufacturer only rates it to 25hz.

 

[sqall12001]

I'm guessing on the xmax right now, but it's just a cheap sub i've had for years (was in g/f car years ago)
I'm guessing its a kind of a "guessed freq responce" b/c i don't trust there specs too much

-Nick

 

[SteveCallas]

It's not that I think he needs more low end extension, it's that a super flat FR to 20hz will likely result in a peaked low end due to room gain. To save excursion, instead of decreasing the tune, just play with enclosure size so that there is a very slight rolloff to 20hz.

 

[Bill Fitzmaurice]

Depends on your room size. Flat to 20 Hz looks impressive as all get out but if your room is getting 6dB of cabin gain at 20 Hz you don't need to go that low, and you may be costing yourself a lot of excursion in so doing. An SPL chart in and of itself is Not Enough Information.

 

[sqall12001]

Room is a terrible room for Ht. It's in an appt.

 

[Bill Fitzmaurice]

Room is a terrible room for Ht. It's in an appt.

With a longest dimension of 20 odd feet figure cabin gain will kick in around 28Hz, so no need for a lower f3 than that. But to see what your maximum SPL is with various tunings you'll need to find out xmax.