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Multi-Way Conventional loudspeakers with crossovers

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Old 10th July 2011, 03:13 PM   #21
DrDyna is offline DrDyna  United States
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Quote:
Originally Posted by sreten View Post
Hi,

If you have copied the bass section of the ZX Spectrum c/o, the
value of L1 should tell you that you have already implemented BSC.

rgds, sreten.


Awesome! It was pretty much copied from what Jerome69 gave me, I haven't looked at the ZX Spectrum yet, but I will
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Old 10th July 2011, 09:05 PM   #22
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Nice job ! Better is the design, longer is the listening.

The BSC is already implement in the crossover.
If you feel a lack bass, you can reduce the level of the treble. Verify the resonance frequency of the box, a measurement could help, and after cut shorter the vent could solve the problem.
But you should take a look to the electronic, very important this assertion because the level of fine tuning a loudspeaker depend on the level of the electronic. That explains the marriage between electronics and loudspeakers are not always obvious.
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Old 10th July 2011, 11:54 PM   #23
sreten is offline sreten  United Kingdom
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Originally Posted by DrDyna View Post
Awesome! It was pretty much copied from what Jerome69
gave me, I haven't looked at the ZX Spectrum yet, but I will
Hi, undefinitions site is one of the best for the less technical IMO, worth a good perusal, rgds, sreten.

Click the image to open in full size.
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Last edited by sreten; 10th July 2011 at 11:56 PM.
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Old 11th July 2011, 05:33 AM   #24
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A reference article about BSC :
Baffle Step Compensation
See the link True Audio TechTopics: Diffraction Loss
But we include BSC in the crossover, avoid extra components.

Quote:
Originally Posted by sreten View Post
Hi,
If you have copied the bass section of the ZX Spectrum c/o, the
value of L1 should tell you that you have already implemented BSC.
rgds, sreten.
Exact for a full BSC compensation ! but a precision, if 2kHz ~ LR4 3.3mH but 2kHz ~ LR2/B3 2.2mH. That is the explanation of the inductor value difference between our schema and the ZX spectrum.
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Old 11th July 2011, 12:47 PM   #25
DrDyna is offline DrDyna  United States
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Quote:
Originally Posted by jerome69 View Post
A reference article about BSC :
Baffle Step Compensation
See the link True Audio TechTopics: Diffraction Loss
But we include BSC in the crossover, avoid extra components.



Exact for a full BSC compensation ! but a precision, if 2kHz ~ LR4 3.3mH but 2kHz ~ LR2/B3 2.2mH. That is the explanation of the inductor value difference between our schema and the ZX spectrum.
Thanks Jerome. I had not yet done much reading about bsc, I was thinking it was more complicated than that.

I've been tinkering with speakers for years. They've always ended up better than the cheap speakers from big box stores, but something was always missing because I've only ever tried to make basic crossovers based on values that I've got from online calculators or generic values.

I'm going to keep studying though, I've still got a few pairs to make good crossovers for. I've got one pair that I made about 12 years ago that still have nothing but a capacitor hanging from the tweeter terminal.

You guys have given me pearls though and I'm glad that I'm learning how to do these designs with a little more finesse!

Edit: Jerome, about the bass..I did try it for a moment without my subs to see what it sounded like and it was surprisingly good.

Last edited by DrDyna; 11th July 2011 at 12:54 PM.
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Old 11th July 2011, 01:03 PM   #26
sreten is offline sreten  United Kingdom
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Hi,

I don't know where 3.3mH comes from, for BSC you oversize the initial inductor.
Around 1mH is typical for a 2nd order electrical 2KHz no BSC 2 way speaker.

rgds, sreten.
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