please help My problem starts after passing the half volume

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i am new to this installation and car audio so please help me.

our system is shortly i post there all devices we used.

best wiring possible spend 200$ on wiring we even buy
Rockford T4004 amp --- speakers
http://www.rockfordfosgate.com/products/product_details.asp?cat_id=2&series_id=7&family_id=24&item_id=100033&locale=en_US


Front doors
Infinity Kappa 50.7cs
http://www.crutchfield.com/S-YsnhvKhExOk/cgi-bin/ProdView.asp?g=410&I=108507CS


Rear Deck
Infinity Kappa 693.7i
http://www.crutchfield.com/S-YsnhvKhExOk/cgi-bin/ProdView.asp?g=400&I=1086937I


ROCKFORRD 600.1bd amp
http://www.rockfordfosgate.com/products/product_details.asp?cat_id=2&series_id=6&family_id=19&item_id=106477&locale=en_US

Infinity KAPPA PERFECT12VQ SUBS X 2
Rear Deck installed and both attached to the Rockford 600.1bd amp
http://www.infinitysystems.com/caraudio/product.aspx?ProdId='KAPPA+PERFECT12VQ'&Ser=KPE&Cat=SUB

the subwoofers attached to the rear deck making insane noise.after half
volume we loose the quality we have on half volume. before half volume
and normal volume works very clean crisp on tweeters and so nice on
woofers deep and clean bass but not high what we want to make it work
is high volume clean bass, .. but woofers are killing us after half
volume , bass is starting a strange sound it still hits but normally it
sounds like clean bam bam bam,then reaching the half volume then starts
bamwwww bamwww bamwww(sorry about my expression) what we need is very
deep clean bass. we donot hesitate to spend money but we donot want to
pay 1000$ to circuit city to install to what we have in our mind. they
offer us 1000$ even we supply all parts amps power cables and speaker
wiring we give them so we decide to install ourselves we already invest
quite money. no problem if anything missing on you guys opinion please
post. all be appriciated we really need help. we really want to make it
work ourselves.

very thanks. sorry to take you guys times..
..

[Matt Ion]

wrote:

> Infinity KAPPA PERFECT12VQ SUBS X 2
> Rear Deck installed and both attached to the Rockford 600.1bd amp
> http://www.infinitysystems.com/caraudio/product.aspx?ProdId='KAPPA+PERFECT12VQ'&Ser=KPE&Cat=SUB
>
> the subwoofers attached to the rear deck making insane noise.after half
> volume we loose the quality we have on half volume. before half volume
> and normal volume works very clean crisp on tweeters and so nice on
> woofers deep and clean bass but not high what we want to make it work
> is high volume clean bass, .. but woofers are killing us after half
> volume , bass is starting a strange sound it still hits but normally it
> sounds like clean bam bam bam,then reaching the half volume then starts
> bamwwww bamwww bamwww(sorry about my expression) what we need is very
> deep clean bass. we donot hesitate to spend money but we donot want to
> pay 1000$ to circuit city to install to what we have in our mind. they
> offer us 1000$ even we supply all parts amps power cables and speaker
> wiring we give them so we decide to install ourselves we already invest
> quite money. no problem if anything missing on you guys opinion please
> post. all be appriciated we really need help. we really want to make it
> work ourselves.

If you read the manual for those subs (PDF version is at the link you
provided), you'll see they require a box of some sort - sealed, ported
or bandpass are all appropriate, but they do need ot be in an enclosure,
not just mounted to the deck.

There are other issues with simply mounting subs up to the rear deck
without at least a good solid baffle, but those are moot, since the
drivers should be in a box.


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[Mister.Lull]

....and if you wanted to try and get REALLY creative (and still want
your subs coming up through the rear deck), you could make a box that
attached to the under-side of the rear deck...........

~Mister.Lull

[[email protected]]

thanks alot guys.
i am searching a place to find sealed enclosure for infinity kappa 12"
perfectvq.
any recommandations for best one?
price doesnot matter