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Multi-Way Conventional loudspeakers with crossovers

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Old 8th February 2013, 06:34 AM   #51
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300Hz - 3Khz

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Old 8th February 2013, 07:43 AM   #52
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Nope 300 to 3000 Tweeter handles everything higher than 3000Hz
Maybe 4000 for a really good small midrange

http://www.tymphany.com/files/HDS-P8...20Rev2_0_0.pdf

Fs of the Peerless is 89Hz so 2 octaves above resonance if 360Hz and if you look at the performance graph it gets very ratty and broken up above 8k

You need to pick a XO point where the drivers response is reasonably flat and smooth for an octave ( at least ) above and below the XO point so in this instance 3k looks OK to me. It is a design starting point anyway
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Old 8th February 2013, 09:01 PM   #53
tvrgeek is offline tvrgeek  United States
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From the chart, that does not look like the "very good midrange" that I too am looking for. I would not use that thing above 2.5K with at least third order and them probably need a notch filter. Major breakup at 5K. Might use that with a big 12 inch in a floor stander, but you are still stuck with a crossover in the sensitive hearing range. No XT-25 here. I bet it is pretty sweet in the 200 to 2K range.
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Old 8th February 2013, 09:33 PM   #54
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Well the OP already has it so we'll need to work on the XO then; but 3rd orders are getting out of beginner designing, I don't like them personally.
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Old 8th February 2013, 10:10 PM   #55
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Notch filter at 5K should help a lot I would think... that would bring the rolloff to a pretty nice 2nd order.

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Old 9th February 2013, 05:35 AM   #56
Stevenn is offline Stevenn  Australia
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Gawd! Just when i thought i was strating to understand this, you guys get all technical on me
From a session reading Allen B tutorial, plus reviewing comments here and data sheets of proposed and actual drivers, I get the following driver operating ranges:

Woofer 8in SB23NRXS45-8 0-300Hz
Mid 4in Peerless 830992 300-2500Hz
Tweeter Peerless 812978 2500+ Hz

Basically I treat my 3 way as 2 x 2 ways and try and bring every thing back to common or lowest driver sensitivity SPL?
Logic dictates that you start with tweeter and work backwards?

Win ISd does not appear to allow modelling of sealed tweeters, I assume you just run with manufacturer's data? But then how do you model impedance?

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Old 16th February 2013, 03:46 AM   #57
Stevenn is offline Stevenn  Australia
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Afternoon all
Having studied AllenB article, another site Diyaudioandvideo plus instructions in the 3 way PCBs, I am feeling a little more confident. However latest qsn is concerning the bandpass filter crossover frequencies. If I am using 300 Hz and 2400 Hz for my low and high pass frequencies respectively, are these the same frequencies used for bandpass filter, I.e.
300Hz is bandpass High Pass and 2400 Hz is bandpass Low Pass?

Also woofer and mid impedances have peaks at their Fs of 27 and 89 Hz respectively so will these require impedance attenuation or are they sufficiently distant from cross over to be dampened sufficiently?

Thanks
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Old 16th February 2013, 04:04 AM   #58
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89 X 2 = 178 X 2 = 356 so not quite 2 octaves, but slightly greater than 1 1/2 octaves. What is the size of the midrange internal box and what is the midrange "In box" resonance?
If the midrange in box resonance is below 180/200 then it is OK if not perfect and XO spread can be dependent on slope. if using 300 as the bandpass high pass and both crossovers use 2nd order electrical then it may be OK, but if using a first order slope on the woofer then it may need to be crossed a little lower. I read a book by Weems which recommended using the inverse bandpass ratio to set the woofer and tweeter XO points. 2700/300=9 so 1/9 so use 270 for the woofer and 3k for the tweeter General sort of guideline and not gospel but it gives you an idea of the things that need thinking about
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Old 16th February 2013, 04:35 AM   #59
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I just put some figures into the box program. the Peerless will work in any volume from 1 litre to 10 litres but the optimum for power handling Vs musicality seems to be between 4 and 7 litres
At 4 litres the Fc is 112 Hz using the bigger box (7l) it is 103Hz and you could get away with a first order ( a single cap in series ) at 300 but the midrange clarity would probably be better with the second order
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Old 16th February 2013, 05:38 AM   #60
Stevenn is offline Stevenn  Australia
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Thanks Moondog
There seem to be quite a few little tricks the more I read of this topic.
Mid sealed box resonance 113Hz (Unibox) and 109Hz (winIsd) with vol 4.5 litres.

Reason for qsn re bandpass freq is that PCBs instructions contain tables for high/low crossover frequency components plus bandpass frequencies with first and second order crossovers.
So am I correct in assuming values to be used in table for bandpass crossovers are the same ones as for high and low crossovers in general?



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Last edited by Stevenn; 16th February 2013 at 05:40 AM. Reason: Clarification
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