I need a little help. Im trying to decide what enclosure to go with between a slot ported box from bassworx ( this box looks are appealing and each chamber has its on slot port but this is the bulkier box its tuned to 37 hz or another slot ported enclosure which is a bit smaller which is a plus and i can raise the rear platform that covers the area where the spare is and position it up to conceal the box now this box features only one slot port in the middle which both chambers share and is tuned to 45 hz what do you think? I dont know if theres much difference between 37 and 45 hz but any feedback would be greatly appreciated thanx in advance.

I depends on the subs you are using.

Well, there is going to be a huge difference insode the vehicle. Unfortunately, I have not installed my system yet (waiting on the DIN kit from Scosche), so I can't tell you what problem frequencies are in the HHR.

Are you trying to get "booming' bass, or do you want it to hit hard and accurate? I also own a recording studio, so I might be able to help out a bit.

i want booming bass because i listen to mostly rap music. Im using two 12" premier woofers with a max rating of 1200 watts

A good place to start is Pioneers web site and see what they recomend. You should be able to see the manual for your model in .PDF form.

Well, I know you wanted to use the package shelf (from your post), but I would recommend the enclosure with 2 separated internal boxes - 1 for each woofer. This will give you the cleanest bass sound. One thing you need to know, but did not mention - what is the "sensitivity" rating on each of theses; and are they 4 or 2 ohm?

This rating will tell you what kind of power you'll need to acheive the desired SPL.

I would guess they are dual 4ohm voice coils but there are several models of Pioneer Premier subs.

Well, I know you wanted to use the package shelf (from your post), but I would recommend the enclosure with 2 separated internal boxes - 1 for each woofer. This will give you the cleanest bass sound. One thing you need to know, but did not mention - what is the "sensitivity" rating on each of theses; and are they 4 or 2 ohm?

This rating will tell you what kind of power you'll need to acheive the desired SPL.

Actually with ported boxes you're better off having a common chamber. It's a good idea to have separate chambers for sealed boxes, because if one of the subs blows, the other will theoretically 'see' the entire volume of the enclosure, increasing efficiency, and decreasing the power handling of the woofer. With a ported box, however, if one subwoofer blows, the other will still assume the same internal volume of the enclosure. Also, with separate chambers, the ports in either chamber have to be identical in port area as well as tuning...or else you will get cancellation.

As far as the boxes...go with the one with the lower tuning. 37hz is a little high IMO, but 45 is too high for a daily driving enclosure. Make sure your amplifier has a subsonic filter as well, and set it to around 25 hz. A ported box will generally 'unload' at 1 octave below tuning, basically causing the subwoofers to start bottoming out, throwing the suspension off, and eventually misaligning the voice coil, rendering the sub useless :)

Also...the efficiency is not all that important...most companies overexaggerate their efficiency ratings (there is no real standard to measure such specifications). I'd worry more about properly matching the subwoofers to the right enclosure.

Dude, so much bass, it starts affecting the suspension, what if the my HHR is lowered, also???!!!



JUst playing, sounds like you know your stuff, Rock ON!!!!

Well, thanks for al the help. Had the subs installed already, the box is big or bigger than i really wanted but im comfortable with it for now since i will upgrade to a sealed enclosure later on. Overall im happy with the set up bass is very deep and loud but i realize that i prefer sealed enclosures. Im still waiting to get the new faceplate for the sub box bcuz the one i have is red and i want the blue one but i'll post pics soon. Again thanks for all the helpful info

(there is no real standard to measure such specifications).

The standard is:

SPL @ 1-watt input, measured @ 1 Meter.

It's been around for 30-years that I know of.

The standard is:

SPL @ 1-watt input, measured @ 1 Meter.

It's been around for 30-years that I know of.

A lot of companies are measuring at 2.83v/1m

Example: MTX- http://www.mtxaudio.com/caraudio/products/subwoofers/TechData_T9510-04.pdf

Now, take that 2.83v, and apply Ohm's Law:

P=E^2 / R

P is power
E is voltage
R is resistance

P= 2.83^2 /4

P= 2 Watts

The gimmick is that 1w can still be derived from 2.83v, if you're using an 8 ohm resistance. However...most car subwoofers use 4 ohm coils- which would put the input power at 2 watts, as opposed to 1 :)

Those of you who would like to see the subs, amp & box can check them out in pic gallery under members hhr's. Again thanks for the help, i appreciate it! :beer: Im not keeping the faceplate on i just have it on to show you how it looks still waiting for the blue and black one ( since my HHR is blue).

Those of you who would like to see the subs, amp & box can check them out in pic gallery under members hhr's. Again thanks for the help, i appreciate it! :beer: Im not keeping the faceplate on i just have it on to show you how it looks still waiting for the blue and black one ( since my HHR is blue).

Looks good- nice amp :). Love Memphis amps...ran a few of them myself :)