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Multi-Way Conventional loudspeakers with crossovers

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Old 25th February 2013, 09:30 AM   #21
shmb is offline shmb  Australia
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Quote:
Originally Posted by sreten View Post
Hi,

Care to elaborate on that misinformation ?

rgds, sreten.
Yes, I'd also like to know if this is true.

I read this article which sort of makes sense. http://www.cartchunk.org/audiotopics/SeriesSpeaker.pdf

Any thoughts, although this might be worthy of its own thread.
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Old 25th February 2013, 04:23 PM   #22
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I take any paper without a "Conclusion" section with a grain of salt.

That said, damping factor is calculated by dividing the impedance of the load by the output impedance of the amp (and cable). In most situations you get a fairly high damping factor - dividing it by 2 will probably get you a number that affects Q very little.
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Old 28th February 2013, 07:26 PM   #23
system7 is offline system7  United Kingdom
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Quote:
Originally Posted by sreten View Post
Hi,

Care to elaborate on that misinformation ?

rgds, sreten.
I think I'd be pretty dumb to reply to such a typically barbed sreten-like comment!

I'll talk about what interests me.

When I use a word like damping factor I refer to the overall system behaviour. The fact is D'Appolitos need twice as much cabinet size for the same bass performance:

Click the image to open in full size.

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shmb, what you need to know here is the bass reflex parameters for your 11 litre individual bass enclosures:

Click the image to open in full size.

FWIW, I'm not sure I buy the configuration you have built, since 3kHz midrange lobing is no better than with a two-way, but let's make the most of what you have.
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Well, there it is! Best regards from Steve in Portsmouth, UK.
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Old 28th February 2013, 11:55 PM   #24
shmb is offline shmb  Australia
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I decided to use this configuration because I needed to cross the 2 main woofers low enough (450Hz) to avoid massive horizontal issues.
I didn't want them working up to 3kHz. .....I tried it (minus the mid range) in a different enclosure with the woofers mounted closer together and the variation was still shocking to my ears.

I'm assuming this is one of the ways to get around it?

Unless you're talking about some other lobing issues I'm not aware of, ...not sure.


Outright bass response wasn't such an issue as its only a centre speaker.
I know the 11L enclosures are on the small side, but they still seem to do the job down to about 60-70Hz. (optumum crossover point on my AVR settings)

One thing though that puzzles me, I may have tuned mine too low, (approx 40Hz) the doumentation shows FB at 50Hz.
However in Dissi's impedence graph simulation, it shows a massive lower resonant peak at 15Hz, relative to the higher peak at approx 60 Hz.
I've always thought that means the port tuning frequency is too high?

Am I wrong again?

Or maybe its better off sealed.

Last edited by shmb; 1st March 2013 at 12:03 AM.
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