15" RE SX questions (Advice please)

[millimac247 10+ year member]

Here is my situation. I have a 15" RE Sx subwoofer with a planet audio 1250.1 amp. The box is ported around 33hz. Just to list out the rest of the system I have stock door speakers (plan on replacing with hertz soon) and a kenwood kvt-717dvd for the headunit. This is all in a 2006 suzuki Grand Vitara.

Example:

I will listen to a song like Lil Jon - Throw it up. The bass sounds real clean until it gets to the low low notes. The notes sound really boomy and the sub is probably bottoming out. I have the SSfilter on but its probably needs to be adjusted. Could this be due to lack of power? Port area to small?

Please give any input. Thank you in advance.

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[WildSebring 10+ year member]

Can you hear the sub bottoming out? My old RE SX 15" was like that...I had it in 4 cubes tuned to 30Hz and the higher notes sounded good, but the low low songs it had that sound to it..but it never bottomed out. You sure your not hearing port noise?

How big is your box, cubes/port area?

 

[latin22 10+ year member]

Here is my situation. I have a 15" RE Sx subwoofer with a planet audio 1250.1 amp. The box is ported around 33hz. Just to list out the rest of the system I have stock door speakers (plan on replacing with hertz soon) and a kenwood kvt-717dvd for the headunit. This is all in a 2006 suzuki Grand Vitara.
Example:

I will listen to a song like Lil Jon - Throw it up. The bass sounds real clean until it gets to the low low notes. The notes sound really boomy and the sub is probably bottoming out. I have the SSfilter on but its probably needs to be adjusted. Could this be due to lack of power? Port area to small?

Please give any input. Thank you in advance.

How big is the box.Its needs to be about 4 cubes and tuned to about 35 Hz.

 

[GAM3OVR 5,000+ posts]

box specs, port specs and amp settings plz

 

[audioholic 5,000+ posts]

Lack of power will make your speaker cone move less, not more. This means there is less chance of bottoming out than if you were running more power. So unless you turned your gains artificially high to compensate, that's not a likely culprit.

With a 33hz tuning, a SSF probably isn't even necessary, unless you enjoy listening to 10hz sine waves at full power. But if it makes you feel better, just turn the SSF to 20hz and leave it there. Done.

Lack of port area will tend to do two things. Restrict cone movement, thus hurting output. And increase air velocity inside the port, thus ioncreasing turbulence which causes 'port noise'. It would be more pronounced in the lowest notes, closer to tuning, as the system relies more on the ports and less on cone movement than at any other time.

Why didn't you tell us the box specs? Size and port dimensions.

A possible simple fix could be reversing phase on the sub. Most people dont know to try their sub system in and out of phase with their front speakers, to see which sounds best. Everyone should know this.

 

[millimac247 10+ year member]

oh thanks for all the input. I do play with the phase lol (everyday I switch it man.) I have come to the conclusion that the box is too small. It is only around 3.5 cubic feet. Anyone trying to build/sell box for the low? I could also be port noise( I was trying to say that but had a brain fart.) Thank you all again. Would poly-fil help this?

 

[Looney_Tune 10+ year member]

I had my 15" SX in 3cf and it sounded good...is that 3.5cf after sub/port displacement?

 

[millimac247 10+ year member]

Oh it sounds good. Its just the lower notes that seem like its trying to move too much air. After sir, I think I might just have to get a new box built for it.

 

[millimac247 10+ year member]

This work better?

http://www.fishercustoms.com/store/index.php?main_page=product_info&cPath=1&products_id=22

 

[BIG_SUPERMAN72 10+ year member]

Id say your amp is not tuned correctly. Your box is fine. Listen to that exact song and tune it to preferance.

 

[Jakeeck 10+ year member]

This work better? http://www.fishercustoms.com/store/index.php?main_page=product_info&cPath=1&products_id=22

how is that box only 4.02 cubes...? wouldnt it be like 5-5.5 cubes?