Q 12's to 15's SQ Question

[donauaj 5]

I recently had 2 12 Q's and am upgrading to 2 15 Q's and was wondering will I lose a noticeable amount of SQ? Both applications are sealed boxes. Same amp & location

[donauaj 5]

Has no one here upgraded from 12's to 15's? Conventional wisdom says that SQ would probably go down, but will it be by a good amount or something I won't even notice?

[ShaneSauce 2]

I don't see how SQ would go down..

But then again I'm not a expert..

[tejcurrent 13]

It will probably go down quite a bit unless you are upgrading your front stage to compensate for how much louder it will be.

As far as the sub itself, the 15" Q sounds just as good as the 12 to me.

[donauaj 5]

Ah, that's what I was looking for. My front stage is polk components with 4 channel amp, so I have plenty of headroom to compensate for louder subs. Appreciate the help

[KU40 173]

Perhaps if you used terms more specific than the completely broad and subjective "SQ" somebody could more precisely pinpoint the differences.

[jcarter1885 995]

I recently had 2 12 Q's and am upgrading to 2 15 Q's and was wondering will I lose a noticeable amount of SQ? Both applications are sealed boxes. Same amp & location

Basically you wont lose anything by switching to 15's, unless you go to a cramped box that is not suitable for the 15"s. If you cant get a decent size box in their for the 15"s dont go for it but if you can then you will gain slightly more output (just a little noticeable because of the extra cone area). Thats it

[donauaj 5]

I mean, yeah, I want more output, but I also want more displacement from the added cone area. Made the mistake of going to an image dynamics ID MAX and it was loud, but i couldn't feel shit, and I don't want to buy another one of those cause I feel they're too pricey for what they are. Now I'm getting rid of the MAX & going back to the Q's

[///M5 2,833]

Ah, that's what I was looking for. My front stage is polk components with 4 channel amp, so I have plenty of headroom to compensate for louder subs. Appreciate the help

That won't "keep up" with a single 10 more or less two 15's.

I mean, yeah, I want more output, but I also want more displacement from the added cone area. Made the mistake of going to an image dynamics ID MAX and it was loud, but i couldn't feel shit, and I don't want to buy another one of those cause I feel they're too pricey for what they are. Now I'm getting rid of the MAX & going back to the Q's

That was a box problem. The IDMax is not anywhere near my favorite driver, but don't fault the driver for the install.

[donauaj 5]

That won't "keep up" with a single 10 more or less two 15's.

What do you mean by it won't 'keep up' with two 15's??

[Duran 387]

What do you mean by it won't 'keep up' with two 15's??

Your front stage.

[donauaj 5]

Your front stage.

I'm not worried because i've tried out my front stage at full gain before & it's always been way more than I can handle, like painful to me. It's more the other way around, I've been looking for subs to keep up with my front stage cause I'm only at about 75% on the fronts right now. They're a good pair, probably one of the few things in my car that I never want to upgrade until they break.

[kirill007 52]

Full gain?, you need to set the gain properly using a o-scope or a dmm, or by ear.

If you put it at full gain and don't hear distortion, then something is wrong, with you're ears, or with you're HU.

[///M5 2,833]

Your front stage.

I'm not worried because i've tried out my front stage at full gain before & it's always been way more than I can handle, like painful to me. It's more the other way around, I've been looking for subs to keep up with my front stage cause I'm only at about 75% on the fronts right now. They're a good pair, probably one of the few things in my car that I never want to upgrade until they break.

Good pair, like the way they sound, painful...whatever, still won't keep up. Not even close. Do yourself a favor. Play an 40hz note on your sub and a 80hz note on your mids and see which one is louder and then lets talk about "keeping up"

[donauaj 5]

Since when can subwoofers not play 80Hz??

[Duran 387]

Since when can subwoofers not play 80Hz??

They can, but that's what your mid is for, midbass. Not sub bass.

[donauaj 5]

Since when can subwoofers not play 80Hz??

They can, but that's what your mid is for, midbass. Not sub bass.

That's why my front stage combines with the bass so that 80Hz is not either one, but both together

[Duran 387]

Since when can subwoofers not play 80Hz??

They can, but that's what your mid is for, midbass. Not sub bass.

That's why my front stage combines with the bass so that 80Hz is not either one, but both together

Underlapping will yield better results versus overlapping and causing more then one kind of speaker playing the same frequency. oh and 80 Hz. is too high for a subwoofer. That's in the midbass range.

[///M5 2,833]

Since when can subwoofers not play 80Hz??

They can, but that's what your mid is for, midbass. Not sub bass.

That's why my front stage combines with the bass so that 80Hz is not either one, but both together

Combining and having your sub play 80Hz doesn't work, in particular since you started this thread asking about SQ.

80Hz is super easy to localize

[donauaj 5]

Do you think I'm going for a truly SQ car with TWO 15's. And it doesn't matter if 80Hz is mid-bass or not, a sub can still reproduce it pretty easily. That's why you set the low pass & high pass frequency around that range so both front stage & subwoofers blend together. It may look bad on paper, but I've set my amps & head-unit that way before & it sounds pretty good. Plus, I'm asking about the transition of my subs to larger one's, not the status of the rest of my system.

Edited August 10, 2009 by donauaj