subs have become weak

[Drumbc]

i have 2 hds212 subs with a alpine mrx110 amp in a custom ported enclosure with 2.1 cubes per sub tuned to 34hz...... when i first put these subs in the box after a few days break in turning them up they were ridiculously loud! i was very happy and very pleased, now randomly there just not as loud anymore? yes there still loud its not like a blown sub there still powerfull but a lot less than just 3-4 days ago. i haven't changed in any settings on them its just random i've checked my alt and batt there both fine getting 13.6 volts at idle on the amp i just cant figure it out i dont have any bass boost or anything like that..... i set my gain using a dmm 50hz tone at 0db and set the amp to output 40v so i dont think im clipping or anything like that. i also dont think its cause i just got used to it because my back hatch doesn't flex like it used to it still vibrates but it used to literally like jump..... please help me figure this out its about as loud as my old kicker cvr setup so its still loud but it used to be a whole lot louder im so puzzled i cant figure this out also ive pushed in on the subs no scraping noises move freely im so confused. any help is appreciated.

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[garychoffmann 10+ year member]

Box seam split, bad connection on wire limiting current, pinched rca's.... put the test tone back on and see if you still are holding 40

 

[Drumbc]

box is brand new built by boomsday off this forum so i dont think that would be it but ill look it over..... i put the test tone on and im holding 39.9 and jumping to 40.0 so im right on the money with that, ill replace the rca's tomorow with new knu konceptz tomorow morning... hopefully its just that easy.... any other suggestions????

 

[garychoffmann 10+ year member]

If you're still getting 40v the rca's are fine. Check power/ground connectiions.

 

[Drumbc]

powers good 4 gauge ofc knu konceptz and fuse is good maybe its my ground though maybe i should try a new ground? i've never really liked my ground but cant find a good spot......

 

[JoshC 10+ year member]

It hasnt gotten quieter, your ears are adjusting.

double your power, get bigger 12s

 

[TheFiverMan 10+ year member]

why are you setting gains with 0db tone? use a -6db tone 40hz

 

[dbjunior 10+ year member]

Check the subs maybe dropped a coil or a wire in the box.

 

[Drumbc]

i dont think its my ears at all because the back hatch used to really move like i could watch it literally jump, now its more of just a vibration...... and i set with 0 db cause i listen to alot of bass heavy songs i have set with a -6db tone once and could hear audible distortion

 

---------- Post added at 09:58 PM ---------- Previous post was at 09:57 PM ----------

 

Check the subs maybe dropped a coil or a wire in the box.

dropped a coil?

 

[TheFiverMan 10+ year member]

check impedance and you will have your answer if the sub is good or bad

 

[Drumbc]

i checked impedance on them both ran together from terminals on outside of box got a stable 2.4 ohm load

 

[Boomin_tahoe 5,000+ posts]

I'm betting $$ one of the speaker wires came off and the 2nd sub is acting like a passive radiator.

 

[jboy2015]

Check ALL connections brody

 

[Jeffdachef 5,000+ posts]

check all connections. Go to autozone and LOAD test your battery. Could be a dying batt too. even though its decent voltage.

 

[dbjunior 10+ year member]

i dont think its my ears at all because the back hatch used to really move like i could watch it literally jump, now its more of just a vibration...... and i set with 0 db cause i listen to alot of bass heavy songs i have set with a -6db tone once and could hear audible distortion 

---------- Post added at 09:58 PM ---------- Previous post was at 09:57 PM ----------

 

dropped a coil?

With dvc subs you can kill a coil and the sub will still work. What are you wired to ? What impedance are your subs. Check surrounds and and spiders to make sure nothing is lifting from a bad glue job.