Have you ever seen a truck with a blow though put more subs inside the cab?

Because there isn't enough room for the subs you want to run inside of the cab. But there is room inside of the cab to run something different or to try and fill in 80hz and above. This is just brain storming for SPL types of systems.
A sub to play that high would be a bad fit in that kind of system. 10" inch pa mids crossed a bit lower on lower than rms power would be a better option because of the sensitivity...but no matter what you're not gonna really notice that gap at full tilt.

As the pressure builds on your ears, the ability to hear full range of frequencies starts to fall off. That's why a lot of bass at high volume will give the "underwater" sound.
2 stereo integrity sql-15's on 3k in a sealed box was able to do that in my old saturn. And that wasn't an spl build 😂
 
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A sub to play that high would be a bad fit in that kind of system. 10" inch pa mids crossed a bit lower on lower than rms power would be a better option because of the sensitivity...but no matter what you're not gonna really notice that gap at full tilt.

As the pressure builds on your ears, the ability to hear full range of frequencies starts to fall off. That's why a lot of bass at high volume will give the "underwater" sound.
2 stereo integrity sql-15's on 3k in a sealed box was able to do that in my old saturn. And that wasn't an spl build 😂
Ah! That makes sense. The aim would be to fill the space at regular listening to loud volume levels to fill that sonic space that's missing. But I see what you're saying and it makes sense!
 
What about a walk through? Camper shell? Remove rear window port through rear window?

This is my IG, I am not designing for anyone right now, but maybe some ideas a for you:

The blow through is already installed. I'm now exploring ideas for the inside. The plan is to do something similar as Spokey9 said. His comment confirmed that the direction I'm headed is probably the right one. I'm just thinking out loud I guess.
 
The blow through is already installed. I'm now exploring ideas for the inside. The plan is to do something similar as Spokey9 said. His comment confirmed that the direction I'm headed is probably the right one. I'm just thinking out loud I guess.
Ah ok, sorry I missed that part where it was already installed. I'm in the same boat, based on what you wanted, I'd also recommend pro audio. There's some really wide range playing speakers that pro audio offers that you can probably EQ however you like. What frequency range are you missing the most? I mean more have you tested specific frequencies?
 
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These or the 8's from stevens would be my first choice. Really good sensitivity and power handling plus able to play lower than a typical PA driver of the same size.

If you can get them in the kicks they'd definitely do a bang up job
 
Ah ok, sorry I missed that part where it was already installed. I'm in the same boat, based on what you wanted, I'd also recommend pro audio. There's some really wide range playing speakers that pro audio offers that you can probably EQ however you like. What frequency range are you missing the most? I mean more have you tested specific frequencies?
Nice work by the way. I feel like it's in the 80 to 120hz range. I'm still a newb so I might be off on this. It's something I can hear. The easiest way to explain it is this. When I had 10's and 12's there is a part the song Money For Nothing, at about the 1:12 mark, the drums kick in before it crescendos, that is now totally missing. You can hear it, but not "feel" it.
 

These or the 8's from stevens would be my first choice. Really good sensitivity and power handling plus able to play lower than a typical PA driver of the same size.

If you can get them in the kicks they'd definitely do a bang up job
Thanks! I'll check them out!
 
Nice work by the way. I feel like it's in the 80 to 120hz range. I'm still a newb so I might be off on this. It's something I can hear. The easiest way to explain it is this. When I had 10's and 12's there is a part the song Money For Nothing, at about the 1:12 mark, the drums kick in before it crescendos, that is now totally missing. You can hear it, but not "feel" it.

So, I used to slow songs and use audacity, so there's programs you can use to actually look at the frequencies of parts of songs. You can you a basic db meter too, possibly, definitely with tones. Maybe also you can EQ frequencies already and see which EQ bandwidth makes it louder or whatever. Not guessing but actually knowing what the range is you want to increase is maybe underrated, but there's several different ways to narrow it down to more surely know. Idk how much you know or not, so just generalizing my experiences.
 
So, I used to slow songs and use audacity, so there's programs you can use to actually look at the frequencies of parts of songs. You can you a basic db meter too, possibly, definitely with tones. Maybe also you can EQ frequencies already and see which EQ bandwidth makes it louder or whatever. Not guessing but actually knowing what the range is you want to increase is maybe underrated, but there's several different ways to narrow it down to more surely know. Idk how much you know or not, so just generalizing my experiences.
Understood! Appreciate all of your thoughts. I'm still learning and exploring everything.
 
I have had to address something similar with 4th orders before. Depending on how its tuned you can possibly raise the Lp even far as 100hz more or less to bring out the higher bass more or if you're tuned low with wind in mind its going to need a strong front stage with those missing frequencies in mind.
Any bandpass by nature has a steep natural rolloff above (4th & 6th) or below (6th) tuning and filter settings can put a hole in your music if not considered. A 4th has a response down low similar to sealed but will fall off pretty hard above tuning. So setting the lp for a 4th at 50hz may create a steep as heck slope affecting that midbass. I've actually seen adjusting the lp higher help somewhat. You have the 4 15 solox setup correct? Do you know the tuning of the enclosure?
And what does your frontstage consist of? Power and drivers?

The thread title threw me off as additional subs in the cabin with a 4 15" solox blowthru is...

What you need is midbass and enough to keep up with your substage imo.
 
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