Subs Not Hitting Hard Enough

[vipervin 10+ year member]

I have two eD 11Kv.2 (dual-2) subs in a 1.1 cu. ft sealed enclosure. They are wired together as a 2-ohm load connected to an Alpine MRD-M605 (600 wrms x 1 @ 2 ohms) subwoofer amp. I have set the amp gains using the tutorial on the forum.

I have had these subs for a couple of months now, and feel like it should be hitting way harder. It is not as punchy as I thought it would be. Yesterday I decided to re-check all my wiring and settings to see if I did something wrong. Again, everything checked out and the amp was putting out about ~35 volts at 75% headunit volume (checked with a digital multimeter).

This time, I put in a 50 Hz 0-dB test tone to actually see how loud it was when I reached the 75% max HU volume (even though I never listen to my music that loud). Anyways, well before I reached that 75% volume, at slightly above 50% of the max volume, my subs started to spit out a higher pitched noise. That pitch remained to the 75% volume level and the bass never got any louder. In addition, it seems like the cone goes inward instead of outward.

It is hard to describe so I took a video of it:

http://video.google.com/videoplay?docid=6697467356563810284

If google video does not work, you can directly download the 5mb file from here:

http://vipervin.com/doclib/subs.mpg

I tested the drivers in both the enclosure and free air, both exhibiting the inward cone pull. I have also hooked up one of the drivers to another (Kicker ZX250.2) amp to see if it was an amp issue, powered it to 250wrms this time, and again same issue.

According to the 11Kv.2 product spec, the average SPL was about 120dB for one sub. I have two subs and they are hitting no where near 120dB.

Any ideas what is going on?

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[Decipha 10+ year member]

uhh reverse phase on the headunit??? i hope its 1.1 for both subs??? i would put them .6 cu ft seperate chambers... that should bring out that punch

 

[Decipha 10+ year member]

oh btw... your not supposed to have the subs hooked when you set the gain... disconnect the subs

 

[vipervin 10+ year member]

Yup, its total 1.1 cu ft for both, but they are actually about ~0.55 in their own sealed chambers. I will have to double check the phase, I am pretty sure the HU is on the default / flat settings.

 

[Decipha 10+ year member]

why not just flip polarity to the subs??? if you can clearly see there firing inward then you should automatically know its backwards somewhere

 

[DaveDSMer 10+ year member]

also check to make sure the box is fully sealed..

 

[vipervin 10+ year member]

I believe its fully sealed //content.invisioncic.com/y282845/emoticons/uhoh.gif.c07307dd22ee7e63e22fc8e9c614d1fd.gif .. but the cone was going inward both in the box and free air