Car Stereo Forum banner

4th order bandpass box designs

5630 Views 6 Replies 4 Participants Last post by  got_focus?
Looking for someone that can design a box and cut sheet for 2 apex jr super 8's. Someone with prior BP experience is a MUST!

Each woofer will be getting 300wrms

Listen to 99.8% rap and hip/hop

Something that has a nice flat transient response 60hz - 20hz

Music only application.

Max dimensions - 40" Wide, 18" Tall, 12" Deep
1 - 7 of 7 Posts
I think this is a bad idea. Those little 8"s have an fs of 47hz and you want to tune them to 20 hz in a small box? No way. A bandpass box is not a simple design and will not give you a nice flat response 20-60hz. The xmax on those subs is less than 5mm, no were near enough displacement to get any usable sound at 20Hz. I suggest a simple ported 12" or 2 10", maybe 2 12" if you want good output at 20Hz.
Never said anything about a small box. Thinking of 6-8 cubes gross.

I understand the 4th order is not a simple box by any means. I have built them in the past, just had other people design them. All the 4th order boxes I have built thus far have had amazingly nice 50-20hz slopes.
what he is saying is you wont get what you are looking for with the subs you have.
...Max dimensions - 40" Wide, 18" Tall, 12" Deep
Never said anything about a small box. Thinking of 6-8 cubes gross...
Your dimensions allow a 3.86 cube enclosure MAX, assuming .75" wood, no port, and no bracing. Not even compensating for driver displacement. Not sure how you plan to get 6-8 cubes out of nowhere.
Bandpass boxes are not know for their low end output. They have very steep roll-offs so there is not much cabin gain and to be honest I can't think of any situation where I would use them over a ported box.
Guess I will just do a ported....thanks

TREETOP - I posted the max dimensions before playing with the 4th order calculator and realized I would need a much bigger box. I was just trying to conserve some trunk space initially.
1 - 7 of 7 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.