I got 2 American Bass XR 12s riding side saddle on my rear seat , will hopefully be building a custom center console box later this year and ditching factory radio as well.

 

Meh. Good speaker design can manage time issues between the drivers in one box. 99.999% of timing is the room, which needs a central computer to control all of them together (and the random reflections in your room), anyway. Studio monitors are designed for studios. Presumably a room already designed for audio before you put speakers in it. Unlike a house.

Not that I have anything against active speakers.

 

It is much harder than one thinks to get time/phase adjustments in passive crossover design. I've tried and read a lot about it. Requires a lot more than most are willing to do.

This is a step response (each peak is a different driver, tweeter, midrange, woofer) for a revel f226be, a really good passive design.
You can see the tweeter peaks (first peak) at about 6.2ms, the midrange at ~6.4ms (second peak) and the woofers (third peak) at ~8.4ms, or 2.2ms later than the tweeter. This would easily be eliminated with an active design to get those peaks to ideally be at the same time.


Concentric (coaxial with voice coils aligned to each other physically) speaker designs like in the kef reference series help solve the midrange / tweeter issues by physically aligning the speakers. You can see just two peaks here even though three speakers. This is also not a trivial design to get this right, a reason why a lot of manufacturers still aren't doing this.

 

Wow you guys are on a different level as far sq goes, I just like it to sound loud and powerful like live music.

 

Me too...I just went down the rabbit hole with it.

 

stay there. don't learn anything else. it will drive you crazy

 

Well, Jacob, I don't disagree as I said above. But...

If you are sitting in your chair in your audio room (or car), and you turn your head 2", you just cancelled out all the work done like that. We can barely get a feeling about something being off/different/imperfect in the <ms range, let alone directly identify it with our ears. I assume those measurements are at 1m? Seldom the sitting distance in a LR or audio room, certainly not uniform for each speaker in a vehicle, only even possible in a studio to match. (and prob seldom actually matched)

And, my god, don't sit 3" off center of the stereo setup. You'll F everything!! Or, the furnace kicks in and gives you around 35db of unwanted noise from 25' away, the soundfield collapses, society falls, apocalypse. Damn it!!

And then there's surround.....I'm pretty happy with my midrange Klipsch speakers, 9 of them, and an excellent SVS sub. Marantz/Audyssey tuned it out pretty good, a circular sound pattern sounds like a perfect circle instead of 9 different locations.

I'm not crazy!!

 

Ya, there are a lot of things in audio that make it hard to get great sound.....and usually requires $$$$$ or a lot of time to do so! Just for clarity, 2ms of time delay is about 24". Humans are actually pretty good about hearing time issues (especially at lower frequencies) if we know what we are looking for, some can hear it down to 0.2ms. I can definitely hear right / left center image shifts between two speakers with 0.2ms change.


But I have also played a lot with this program and have reached at minimum level 7 on all of the listening tests. I participate in ABX tests and other listening tests (A good friend is working on his masters in acoustics engineering and is really into psychoacoustics, he is probably going to write his thesis on this, so he tests his friends a lot!)

http://harmanhowtolisten.blogspot.com/

This was when we were trying out different amps and if we could hear differences between them. This is at a speaker design / manufacturer facility in Phoenix. The speaker in the wood box in the center is a Purifi woofer in a close to reference design (They used a really good dome tweeter instead of the ribbon tweeter in the reference design)

 

So - what is the secret to wiring for the amp coming out of the stock Sync1 head unit?