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Old 12th November 2012, 10:10 AM   #1
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Default Combining xover of 2nd order & 4 order

Dear Folks,

Need help and advice on the following question:

(1) For the attached diagram (Crossover of JBL S2600), for the tweeter part, Does it belong to 3rd order or 4 order ? (because the last L to the ground has one cap in series, which is different from the normal connection learned in Internet)

(2) If the tweeter xover belong to 4 order, then if I intend to add a supertweeter with 2nd order xover. Since 2nd order is 180 degree phase reversed, do I need to connect the supertweeter with reversed polarity ? (provided that the fourth order has no phase shift =0 degree)

Please help.

Regards,
Eric
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Old 12th November 2012, 11:44 AM   #2
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Dear Eric,

Both are second order electric. but the tweeter have corrections : a R//C to increase high frequency level and a LC for attenuate a resonance.
Acoustically it is an other story.
I think, you should go to an other design.

Regards.
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Old 12th November 2012, 02:11 PM   #3
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Default Super tweeter crossover question

Dear Jerome,

Still have few questions:

(1) If the S2600 tweeter crossover is in 2nd Order. Do I simply use also another 2nd order (say 18000Hz) crossover for the supertweeter while maintaining the same polarity as the S2600 ?

(2) Is it common or not recommended to have 2nd crossover for the tweeter (S2600) while putting my super tweeter by using 3rd order crossover

(3) We always find the polarity switch for the subwoofer but seldom find the polarity switch for the individual super tweeter unit (with built-in crossover, like Tonnoy or JBL type). Does it mean the high freq does not care much about the polarity effect ?

Regards,

Eric
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Old 12th November 2012, 02:23 PM   #4
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Any idea why there are two 82 ohm/10w (R1, R2) across the LF. Similarly, the 5.1 ohms (R4) across the HF.

Regards
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Old 12th November 2012, 02:54 PM   #5
sreten is offline sreten  United Kingdom
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Hi,

The order of the x/o (acoustic or electric) does not affect driver phase
in the passband, the actual acoustic slopes effect the phase matching
around the x/o point.

For 2nd order acoustic x/o points the phase for each driver is + and
- 90 degrees, giving a total of 180, so you reverse one drivers phase.

For 4th order acoustic x/o points the phase for each driver is + and -
180 degrees, giving a total of 360, so you connect drivers in phase.

There is no simple answer to the phase of adding a supertweeter,
if you are allowing drivers to overlap rather than crossing over.

rgds, sreten.
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Old 12th November 2012, 07:52 PM   #6
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Quote:
Originally Posted by iceman009 View Post
Dear Jerome,

Still have few questions:

(1) If the S2600 tweeter crossover is in 2nd Order. Do I simply use also another 2nd order (say 18000Hz) crossover for the supertweeter while maintaining the same polarity as the S2600 ?

(2) Is it common or not recommended to have 2nd crossover for the tweeter (S2600) while putting my super tweeter by using 3rd order crossover

(3) We always find the polarity switch for the subwoofer but seldom find the polarity switch for the individual super tweeter unit (with built-in crossover, like Tonnoy or JBL type). Does it mean the high freq does not care much about the polarity effect ?

Regards,

Eric
Eric see Sreten's Response. I think if you want good treble, use an other design or speaker. To have good treble you should redesign the speaker because to have a good phase, good treble, you should measure the responses.
Honestly, you don't need a super tweeter, this response might not satisfied you
http://www.jblpro.com/pages/pub/components/2426.pdf

Quote:
Originally Posted by Michael Chua View Post
Any idea why there are two 82 ohm/10w (R1, R2) across the LF. Similarly, the 5.1 ohms (R4) across the HF.
Regards
Just for flatten impedance peaks
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