Tuning a sub box???
12-20-2010, 06:25 PM
#2
Different space with a sealed box yields a different response too.
It needs the right amount of breathing area (port area), and the length determines the tune.
Read about port end corrections.
JL should have you covered.
It needs the right amount of breathing area (port area), and the length determines the tune.
Read about port end corrections.
JL should have you covered.
12-20-2010, 06:27 PM
#3
Google "sealed box calculator" and find the useable space, and then google "the 12 volt port calculator" and use the slot port or round port calculator. Try to stay between 10-16 square inches of port area per cubic foot of NET space.
12-20-2010, 08:22 PM
#4
Thank you for the reply. That answers my question perfectly. I'm after SQ and I'm assuming that sealed enclosures are better for sound quality. At least that's been my experience in the past. I have never had a ported or bandpass box in any of my vehicles. I've heard some really nice sounding ported enclosures though.
12-20-2010, 09:44 PM
#5
There are drawbacks with both sealed & ported.
Depending on what you're listening to, 8's won't cover the low end as well as a 12" but if you don't listen to rap than it really doesn't matter. Than again it's subjective. 8's will give tight, accurate, and detailed sound but so can an 18".
Many sealed drivers roll off too early and they don't get that extra low-end response that you'd think you'd see over a ported box. This is where a ported box comes in handy, and if you tune to 30Hz you will have really good SQ and killer lows. Some people say that these 10's that roll off early are "super SQ subs" yet they aren't damn near flat in the response down to 20 Hz.
Look for LMS drivers, RE XXX 12, Eclipse, TC sounds, Soundsplinter... Look for a low distortion subs for a sealed or ported box @ 30 Hz.
Building a ported box is easy, and if you make it right it can have a significant gain over sealed just because you can control the response. Some sealed subs are horrible on the bottom but they blend well.
Use this to figure a sealed box out. Stay between QTC .5 to 1. A QTC of .707 is a flat response that should roll off at -12 dB/octave (as in 20-30 Hz), it's the most efficient alignment. The LMS subs are much better in these boxes. I only know of one 10" that's really good in a sealed box - Eclipse SW8000 in 1.75 cubes is like QTC .707 / FC (roll off point) @ 28.x Hz.
http://www.carstereo.com/help/Articles.cfm?id=30
Depending on what you're listening to, 8's won't cover the low end as well as a 12" but if you don't listen to rap than it really doesn't matter. Than again it's subjective. 8's will give tight, accurate, and detailed sound but so can an 18".
Many sealed drivers roll off too early and they don't get that extra low-end response that you'd think you'd see over a ported box. This is where a ported box comes in handy, and if you tune to 30Hz you will have really good SQ and killer lows. Some people say that these 10's that roll off early are "super SQ subs" yet they aren't damn near flat in the response down to 20 Hz.
Look for LMS drivers, RE XXX 12, Eclipse, TC sounds, Soundsplinter... Look for a low distortion subs for a sealed or ported box @ 30 Hz.
Building a ported box is easy, and if you make it right it can have a significant gain over sealed just because you can control the response. Some sealed subs are horrible on the bottom but they blend well.
Use this to figure a sealed box out. Stay between QTC .5 to 1. A QTC of .707 is a flat response that should roll off at -12 dB/octave (as in 20-30 Hz), it's the most efficient alignment. The LMS subs are much better in these boxes. I only know of one 10" that's really good in a sealed box - Eclipse SW8000 in 1.75 cubes is like QTC .707 / FC (roll off point) @ 28.x Hz.
http://www.carstereo.com/help/Articles.cfm?id=30
Last edited by Lord Huggington; 12-20-2010 at 09:48 PM.
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