Can't decide on sub for car use - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 45 Old 08-16-14, 12:49 PM Thread Starter
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For a while, I had my two Q18's in an extended cab ranger running on 2200w. They were extremely held back by box size, I believe they were in a 4cu.ft tuned to 29hz, but there was a considerable amount of port compression. They still sounded fairly musical though.

I recently bought a Sundown X15 to go in the truck instead of the 18's. The sub sounds extremely musical and accurate, but the mid bass region is leaving lots to be desired (50hz and up). The sub is just EATING amp power above 50hz or so, and not creating much kick drum hits or anything of the sorts. The lows though...they're insane. 2-4 of the X18's in an LLT would be insane in a room... Anyways, my question is this. How can I improve "midbass" response in that range?

Currently the X15 is in a 3cu.ft tuned to 32hz, running on 2200w and taking it like a champ even though it's only rated for 1250w. Even with the highpass at 10hz on my amp, I can play any content at near clipping levels and still not reach xmax or much past it. (It's got 4" travel peak to peak so I'm not worried about that amount of power going to it lol)
I'm to the point where I'm considering returning it to SSA and see about exchanging it for a SSA Xcon 15...that driver seems like it would be capable of what I want to achieve. Plenty of xmax for the low content, relatively high sensitivity, I just haven't been able to throw it into WinISD yet to see how it compares to the X15 in there.

Any opinions on other drivers or box configurations are more than welcome. I can fit around 5.6cu.ft after port volume accounted for in the last box I built, the port was 7"x50" so I can fit a decent sized box in the truck. I really like how this sub sounds, I have not even two hours of play time on it so maybe once it breaks in more the bass region where it's lacking will pick up.

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Last edited by sub_junkie; 08-16-14 at 06:35 PM.
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post #2 of 45 Old 08-17-14, 05:48 AM
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Re: Can't decide on sub for car use

Round......5.

I will get a simulation here soon. I have simulated the X series 15 a LOT. Will probably be my next subwoofer. Also going to be getting some 10" X series also. Just off the top of my head you wont be hitting Xmax until around 20 something Hz. You probably are going to hit Mechanical limits around 16 or so Hz. So try not to play many "chopped and screwed," tracks.

The hardest thing for me to do was to find a cabinet design that allowed me to have RMS power and hit Xmax. These subwoofer from Sundown are crazy. Hitting 30mm excursion takes a LOT of power. I looked at getting a NSv3 15" until I saw I would need something like 7000watts to just hit Xmax without a hpass at 10hz on a 18hz tune.

"Music is the space between the notes"
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post #3 of 45 Old 08-17-14, 10:32 AM Thread Starter
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Round......5. I will get a simulation here soon. I have simulated the X series 15 a LOT. Will probably be my next subwoofer. Also going to be getting some 10" X series also. Just off the top of my head you wont be hitting Xmax until around 20 something Hz. You probably are going to hit Mechanical limits around 16 or so Hz. So try not to play many "chopped and screwed," tracks. The hardest thing for me to do was to find a cabinet design that allowed me to have RMS power and hit Xmax. These subwoofer from Sundown are crazy. Hitting 30mm excursion takes a LOT of power. I looked at getting a NSv3 15" until I saw I would need something like 7000watts to just hit Xmax without a hpass at 10hz on a 18hz tune.
I've played a 17hz song by bassotronics and I still have probably 2" of travel left. Lol. Now that it's breaking in its sounding a bit better but I'm still curious as to what my options would be for different box configurations or a different sub as well. I think this 15 could handle 3000w with ease lol. I'm not sure about how well it would be able to cool itself at that power but speaking in regards to excursion capabilities, 3k would be a walk in the park for it outside of WinISD's calculations

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post #4 of 45 Old 08-17-14, 05:58 PM
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Re: Can't decide on sub for car use

I am curious if it is even getting 2000watts then. You should be breaking it at 16hz with 2000watts.

"Music is the space between the notes"
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post #5 of 45 Old 08-17-14, 08:54 PM Thread Starter
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Re: Can't decide on sub for car use

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I am curious if it is even getting 2000watts then. You should be breaking it at 16hz with 2000watts.
I'm thinking the amp doesn't have a true 10hz HPF, and with differences in box impedance it's probably not seeing a full 2200 at 16hz and below. Box its in now is 3cu.ft tuned to 32hz

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post #6 of 45 Old 08-17-14, 09:36 PM
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Re: Can't decide on sub for car use



10hz 2nd order will keep it from going over 53mm.

"Music is the space between the notes"
“[T]o talk well and eloquently is a very great art, but that an equally great one is to know the right moment to stop.”
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post #7 of 45 Old 08-18-14, 03:59 AM Thread Starter
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10hz 2nd order will keep it from going over 53mm.
Hmm I'll definitely give a 11-15hz tone an test to see what excursion levels I can reach and if they match in WinISD. Port velocity was kept under 24m/s so I shouldn't have any compression and chuffing happening

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post #8 of 45 Old 08-18-14, 05:06 AM
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Re: Can't decide on sub for car use

I dont worry about extreme excursion levels after porting. I have learned from others that WiniISD is not perfect. It tends to simulate a lossy cabinet for sealed and tends to exaggerate the excursion levels. So being close to 50mm your probably still safe unless your amp truly delivers 2000watts while doing sign waves.

Any videos of them moving?

Love Jacobs videos and cant wait to get my hands on my first pair of Sundown subwoofers.

"Music is the space between the notes"
“[T]o talk well and eloquently is a very great art, but that an equally great one is to know the right moment to stop.”
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post #9 of 45 Old 08-18-14, 11:55 AM
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Re: Can't decide on sub for car use

Any specs on this X-15?

Anyway, its construction and even Sundown's description pretty much limits it to a true subwoofer, so not surprised with its performance.

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post #10 of 45 Old 08-18-14, 08:24 PM
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Re: Can't decide on sub for car use

On the same website that has the description are the T/S.

"Music is the space between the notes"
“[T]o talk well and eloquently is a very great art, but that an equally great one is to know the right moment to stop.”
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