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Old 24th September 2009, 06:03 AM   #81
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Ok, so - 20:1 TL for both the speakers together, probably ending at the top of the speaker somewhere, or at the back at the top... I'll sort that out later.

Did you stuff the TL, or just leave it as is? I'll do some testing of my own, but when I put it together, I'd like to know what my best result will probably be.

Thanks again,

Chris
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Old 24th September 2009, 06:35 AM   #82
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Quote:
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Did you stuff the TL, or just leave it as is?
Damping gets denser as you approach the terminus.

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Old 24th September 2009, 07:06 AM   #83
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Ok, thanks for that - Dad's ordered two of the woofers, and the crossover stuff, so I'll be experimenting over the weekend. First job will be to bed in the woofers, then the listening begins...

Thanks again for all the help

Chris
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Old 27th September 2009, 01:18 PM   #84
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Ok, so I made a test box with one woofer (works out around 17L), and 2 full rangers. Must be said - when I'm listening to that, the whole idea makes sense. Goes easily an octave lower than the speakers they are replacing, which is a good start, also, they look smaller - all you see is a thin line, compared to the Missions, which are relatively wide.

Integration isn't perfect yet, but it will be soon - messing with crossover points, but I think I'll go for around 300Hz.

Thanks for the idea, Dave

Chris
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Old 29th September 2009, 06:36 AM   #85
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Discussing this with Dad (again, I know), and he pointed out that, using two woofers (one per side), would the speaker 'beam' at crossover frequency?

I have two of the woofers, so if buying the other two would bring this on, I'll keep the smaller boxes...

Chris
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Old 29th September 2009, 07:10 AM   #86
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I don't see why....

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Old 29th September 2009, 02:15 PM   #87
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I didn't at first, but I think it's to do with the fact that, when you sit to one side or another, the woofers would, effectively be out of phase with each other at certain frequencies. Methinks the 300hz wavelength is too long to notice minor deviations from sitting dead in front of the speaker.

The test speaker seemed Ok, but it used up the woofer's excursion pretty quick, but I suspect adding another 3 of them would bring this down a fair amount for the same SPL...

Chris
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Old 29th September 2009, 03:49 PM   #88
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Quote:
Originally Posted by chris661 View Post
I didn't at first, but I think it's to do with the fact that, when you sit to one side or another, the woofers would, effectively be out of phase with each other at certain frequencies. Methinks the 300hz wavelength is too long to notice minor deviations from sitting dead in front of the speaker.
At sufficiently high frequencies is can be an issue (more so when drivers aren't symmetrical wrt the listener's head, but that is much higher than where a FAST is XOed.

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Old 29th September 2009, 08:23 PM   #89
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YouŽd run into problems when using a single soupwoompher, but with the setup you plan you can stop overtaxing your dadŽs patience and purse.
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Old 30th September 2009, 06:15 AM   #90
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It's been agreed that, after listening to the test cabinet, we should make one of the boxes, to get a good idea of what it will sound like - the test box was big and unbraced, so we figured that, instead of rebuilding that box, it would be better to make our own. Going to get the wood cut at the store (a lot quicker than with a handsaw), but this will probably happen next weekend, as things like open evening are happening at school, then there's a weekend trip so it will be next week before anything gets done...

Chris
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