Ported + Cabin Gain = Good SQ?

[JonJT 10+ year member]

I want a system that is relatively flat response across the entire range of human hearing. Meaning a sub that is relatively flat, and a midbass setup which can blend with said sub and play at an equally loud level. I do believe I can achieve that without problem. I'll be using a pair of Koda 8s upfront and either 2 10s or a single 12 in the trunk. The alignment of the subwoofer is what is baffling me.

After thinking about it between my last post in the thread and your reply, I am going to create a transfer function for my car. Its gonna be fairly annoying. I have to test the speakers I'm going to use, measure their response down to 20 or 18 hz at 1 watt anechoically and then eq them so their flat. Then stick it in the car and do the test. After I get the data I'll decide what to do with it if anything. Honestly, I wasn't ever really worried about proper transition between midbass and subbass. I've been hunting for a proper midbass setup for over a year to mediate the all-to-common problem of under emphasized midbass and overbearing subbass. Finding a sub to blend well with the midbass isn't a problem, its just designing a box for that sub that is a problem. I'll get to work on this asap I guess.

 

[nauc 10+ year member]

I want a system that is relatively flat response across the entire range of human hearing. Meaning a sub that is relatively flat, and a midbass setup which can blend with said sub and play at an equally loud level. I do believe I can achieve that without problem. I'll be using a pair of Koda 8s upfront and either 2 10s or a single 12 in the trunk. The alignment of the subwoofer is what is baffling me.
After thinking about it between my last post in the thread and your reply, I am going to create a transfer function for my car. Its gonna be fairly annoying. I have to test the speakers I'm going to use, measure their response down to 20 or 18 hz at 1 watt anechoically and then eq them so their flat. Then stick it in the car and do the test. After I get the data I'll decide what to do with it if anything. Honestly, I wasn't ever really worried about proper transition between midbass and subbass. I've been hunting for a proper midbass setup for over a year to mediate the all-to-common problem of under emphasized midbass and overbearing subbass. Finding a sub to blend well with the midbass isn't a problem, its just designing a box for that sub that is a problem. I'll get to work on this asap I guess.

just get a 12w6v2, or RE SE or IDQ (some of the top sq subs) and put it in optimum sealed enclosure and level match it with your fronts

 

[JonJT 10+ year member]

just get a 12w6v2, or RE SE or IDQ (some of the top sq subs) and put it in optimum sealed enclosure and level match it with your fronts

All three of those subs are more money than a similar Fi or Soundsplinter model.

 

[Mdjai 10+ year member]

everyone, thanx for all your advice //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Im still torn between Ported or Sealed thoughonder:

If i go ported it will probably be tuned to about 28hz.

Now, if i go sealed what qtc should I shoot for?

I think i dont need anything below .7, cabin gain should boost my lows enough. I want my upper bass frequencies to be just as loud as my low bass. My last system was all lows and barely there upper bass, it was quite frustrating. I think my sealed box was way to big though.

So, what should I probably shoot for if i go sealed? Maybe a qtc of about .8-8.5?