Proper speaker choice

I have purchased an MTX thunderform for my dodge ram pickup. This box came preloaded with a amp and to mtx 10" subs. It sucked. I bypassed the built in amp, removed the 2 mtx subs and added 2 RF punch subs with a puch 300 amp, I have the amp bridged to one channel as well. I am still not pleased with the ammount of base that this produces. I would figure that 2 10" subs would "slam" inside of a pickup truck. I seem to hear the speakers bottoming out on certain base tones. I guess my question is, Seeing the box is a molded plastic box thats holds 2 10" subs and is mounted under the rear bench seat that there isent that much "air space" in the box. I would like to know from the professionals from the field, on what speaker that they would reccomend for this size enclosure. I would really like to keep the amp because I know it has potential and it is just right in size. Now I am not looking for the chapest speaker out there but I also dont want to break the bank either. I am runnig a alpine CVA-1003 head unit, and still have the 6 speaker factory infinity speakers which seem to sounfd fine with the head unit.

Thanks for your help and ideas

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MECP certified (If it really means anything)
Jeremy

Post a link to your exact thunderform and punch amp.

Sealed enclosures should not "bottom out." I have a hunch you're clipping the amplifier or the head unit signal and this is causing some audible distortion - rather than a problem with the subwoofers.

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New Project: 2003 Pathfinder

ALSO FITS QUAD CAB

• Location: Under rear seat
• No loss of leg room
• Bolts to vehicle with supplied hardware (cut out in rear of ThunderForm allows factory jack arm to remain in current location). Jack is unaffected.
• Absolutely seamless-no seams to fail
• Molded in factory colors
• Subwoofers: Two 10"
• Install Sheet in PDF format. (751kb)

Dimensions: 8.687" x 48" x 17.5" Weight: 38 lbs.* Power Handling: 450 Watts RMS* Sensitivity: 87.4dB* Enclosure Volume: 1.7 cubic feet Impedance: 4 Ohm*

Now, I couldent find my model amp because it is last years model, But here is this years model. I beleave that the output is the same.

https://www.rockfordfosgate.com/products/ez2rockford/ModelInfo/ModelInfo.asp?ItemKey=10063520&CategoryDesc=Punch%20Amplifiers

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MECP certified (If it really means anything)
Jeremy

My bet is that you're clipping the signal somewhere if you hear an audible, "bottoming out" sound.  This simply shouldn't happen with sealed enclosures.  Honestly, you might just have unrealistic SPL expectations from the amount of power and subs you have down there.  Even if the gain is set correctly, you might jack up the volume to attempt to meet these expectations, and clip the signal. 

I highly doubt it is a problem with the particular subs, especially since you've tried two different pair.  It would probably be a waste of time to buy another set. 

If you really want significantly higher SPL you'll probably need to use another application (box) and a lot more power.  This probably isn't what you want to hear, but it is my opinion based on what you've told us.

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New Project: 2003 Pathfinder

Well here is a dumb question and a little late to be bringing up but I have the amp bridged to one channel. Both positive leads to the positve output and both negitive leads to the negitive output. But as I noticed when I pulled them out one is a 4 ohm speaker and one is an 8 ohm speaker. How this happened is beond me and I did not catch it when I put them into the box. Could this be an issue?

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MECP certified (If it really means anything)
Jeremy

did you buy both subs at the same time? if so i'm curious as to how you came about with a 4 ohm and a 8 ohm sub.

They were both purchased at the same time same place. I guess it was that I was in a rush to put them in and dident notice. I blame myself rather than the salesman.

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MECP certified (If it really means anything)
Jeremy

i would blame the shop/salesman before you blame yourself. in theory, if you would've had them install the subs then they probably would not have noticed either. good thing there are people out there like you who are giving them the benefit of the doubt and blaming yourself not them.

So,

Do you think that this could be the cause of the speakers both bottoming out and not "hard hitting". I think I should stick with two 4 ohm speakers.

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MECP certified (If it really means anything)
Jeremy

It wouldn't explain the MTX drivers. I still think it is an expectation / clipping issue.

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New Project: 2003 Pathfinder

i bet clipping is the problem. but the main problem is that you want them to hit harder than they are by wanting this you are causing the amp to clip.

So by having 1 sub 4 ohms and 1 sub 8 ohms this has no effect? The reason I got the mtx subs out was because they were the bottom line speakers and the built in am was inside the box. The amp consisted of a pc board with components on it which was about 2" by 2". I was very disapointed with this. My factory speakers pushed harder than this. I decided to put 2 RF 10" punch speakers and to kick up the amp. Asuming I would see a little more out of it. This amp pushed 3 10" punches in my girlfriends car more than I needed. It was incrediable. This is why I thought that by having two speakers with different ohms may be holding me back.

Well you guys were a big help. I guess its time to get "CUSTOM".

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MECP certified (If it really means anything)
Jeremy

it may have an effect, but i don't think it's the main thing. do some more research on here, these guys are a wealth of information. what kind of car did your girlfriend have? take into account everything, the way the subs are firing, the volume of the box...etc.

The main effect is the 4-ohm sub will utilize more power than the 8-ohm sub and will become the main one you hear.  In effrect, you are listening to one sub.  Perhaps this is why you may be overdriving it.

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