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Old 17th March 2011, 05:10 AM   #21
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Usually in three ways ,spectrum is divided in 3 bands : 300 (500)-3000 (5 K) Hz
or in a two way 1.5-2.5 KHz is where the tweeter is crossed . Midrange unit then plays the voice and all instruments in a 3 way ,and the character of 'colouration' in the low end of the mids ...about 300 Hz !??! which happens to be at crossover frequency . Thus a ported box for the mid ...and a different slope and freq. cut and steepness between Woofer and Mid ...!??!
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Old 17th March 2011, 05:10 AM   #22
Jameslc is offline Jameslc  Australia
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Quote:
Originally Posted by tinitus View Post
will the 6" play down to 50hz, and have no xover ?

maybe try to sim the closed version with slightly smaller volume
rolloff will be a bit lower, a nicely 'rounded'

remember that it should be 6db down at xo point to woofer
woofer should likewise be 6db down

maybe also take a look at xmax figures
so where should be the Midranges line like it is now or lower Woofers are green and Mid is yellow
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Old 17th March 2011, 05:14 AM   #23
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Quote:
Originally Posted by Jameslc View Post
so the Midrange is only helping the tweeter with the below 100hz stuff i think that is right?
I'm not quite sure I understand what you mean. . . but no need to port the midbass drivers if you are crossing them over to the woofers, especially if it's a passive crossover.
Ported midbass drivers won't be needed with those big woofers you are using and would likely only make the bass worse.
Using the midbass drivers in a sealed/closed volume will give you better transient response, better power handling and a flatter less reactive impedance.
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Old 17th March 2011, 05:20 AM   #24
Jameslc is offline Jameslc  Australia
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ok yeah i was a bit confused with the 6db down and the xo post earlier anyway i will
have a go at building them after doing all these changes i have my work cut out to work out how many sheets of MDF i need

with the post earlier about floor bounce does that mean will the woofer sound arrive later then the midrange if so do i just move the woofer down the box to make the sound arrive the same time
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Old 17th March 2011, 05:26 AM   #25
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Quote:
Originally Posted by Jameslc View Post
so should i move the woofer down near the bottom of the box?
Well, it kind of depends on where you crossover them, but generally yes.
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Old 17th March 2011, 05:32 AM   #26
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Quote:
Originally Posted by Jameslc View Post
with the post earlier about floor bounce does that mean will the woofer sound arrive later then the midrange if so do i just move the woofer down the box to make the sound arrive the same time
No.
There is direct and reflected sound from both the midrange and woofers, however since bass wavelengths are so much longer bass cancelation can occur when the direct and reflected sound waves arrive at your ears at different times, i.e. out of phase.

You'll almost always hear the midrange before the bass to begin with just because the acoustic center of the midrange driver is closer to the plane of the baffle than the woofers acoustic center is.

Last edited by AEIOU; 17th March 2011 at 05:37 AM.
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Old 17th March 2011, 05:33 AM   #27
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ok i think i have got it perfected
unless there is somthing else i need to improve
but i am going to have to think of different design because i don't really like the look
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Last edited by Jameslc; 17th March 2011 at 05:43 AM.
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Old 17th March 2011, 05:44 AM   #28
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Quote:
Originally Posted by Jameslc View Post
ok i think i have got it perfected
unless there is somthing else i need to improve
Do you listen to music sitting or standing?
Try not to have your midrange and tweeter up too high or the sound from them will be shooting over your ears/head.
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Old 17th March 2011, 05:47 AM   #29
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usually i am sitting in a bean bag about 4 to 5 feet away
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Old 17th March 2011, 05:49 AM   #30
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anyway thanks for all the help everyone i am going to have to play with the design on how it looks and i will post the finished product when it is finished

Last edited by Jameslc; 17th March 2011 at 05:57 AM.
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