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Multi-Way Conventional loudspeakers with crossovers

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Old 26th June 2010, 05:36 PM   #21
Pano is offline Pano  United States
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Quote:
Originally Posted by MisterTwister View Post
2-3 ways are not fun anymore, I need something more exotic.
Oh dear. See where this hobby can lead? You start small, but soon you need a stronger and stronger dose. The classic downward spiral. 2,3,4 way not exciting enough for you, now.
We need to get you into a 12 step problem to cure your 7 way habit.
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Old 27th June 2010, 07:49 AM   #22
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I have to agree with what seems like mostly everyone else on here: the more complicated it gets, the harder it is to get it to sound right. You would never be able to do this (economically) with passive crossovers, which leaves you with active crossovers and fourteen amps. Even by that point, the cost issue is far out the window. Add to that how long it will take you to find the speakers that work in the required octave (ie drivers that sound fantastic in one octave and are cheap) and it's not looking too good. The rack of amps and (depending on how you achieve this) crossovers and it's going to be a beast of a thing. Finally, coming back to the first point, 3- and 4-ways are hard enough to get to sound beautiful (technically fine, but musically very difficult) so a 7-way is going to be murder.

All of that said, I like the idea behind it. Very much thinking outside the box.
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Old 27th June 2010, 11:23 AM   #23
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"Arcus TL 1000" was a 5 way built in the mid 80's

Arcus TL 1000 MK II | Hifi-Wiki.de

I once listened to it, and it was not the worst speaker
in the shop. As far as i remember it sounded rather
well tempered and homogenous.

I believe they used 1. order filters, but i am not sure
about that.

But i guess tuning of such a concept is rather time
consuming.
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Old 27th June 2010, 04:19 PM   #24
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The crossover would not be too bad if you used two DCX2496 in 6 channel mode and maybe did passive for the top octave or a plate amp for the bottom. You would have a lot of control.
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Old 27th June 2010, 04:31 PM   #25
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by LineArray View Post

I believe they used 1. order filters, but i am not sure
about that.
A famous french company had a speaker like that
they were known for making their own special high quality drivers
cant remember the name

ahh, Cabasse it was
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Old 28th June 2010, 02:00 AM   #26
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Quote:
Originally Posted by MellowTone View Post
Even by that point, the cost issue is far out the window... The rack of amps and (depending on how you achieve this) crossovers and it's going to be a beast of a thing.
Back of the envelope I'm coming up with two rack units and around $1000 for a decent crossover and amp bank implementation (exclusive of PC cost). Maybe it's just me, but that doesn't seem like much of a beast. Couple of 0.5RU audio interfaces and a 1RU bank of chipamps or compact power amps such as op amp based ones---with high efficiency drivers and seven channels per side a couple watts per channel would be plenty of power and LME49740s+LME49600s probably sufficient. In the latter case the size of the amp would be dominated by the connectors and not the board space for the four 14-SOICs or 14 TO-263s. Or the trafo or reservior caps. If you really wanted to make the amp board compact five LM4781s would do.

However, I'm curious of the phase response of a bandpass enclosure but am not spotting anything on a quick look. It would be interesting to explore whether much is actually needed in the way of a crossover or if the enclosure responses would suffice.

Quote:
Originally Posted by panomaniac View Post
The crossover would not be too bad if you used two DCX2496 in 6 channel mode and maybe did passive for the top octave or a plate amp for the bottom. You would have a lot of control.
How would you manage phase in such a configuration? At least from the manual the DCX seems unsuited for more than three way due to the structure of its functional blocks and restriction to warped phase.

Last edited by twest820; 28th June 2010 at 02:04 AM.
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Old 28th June 2010, 04:37 AM   #27
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I assume that OP Twisted would use an active crossover , a 3 way . Whether digital or analogue (it depends also by the favorite source ,if vinyl I doubt any would use a DCX...),there will be some passive components to split and equalize the response between the drivers.
As I said , I would study a mold containing the 4 upper ways ,as it goes together with the study of the Xo .But ,aren't front horns same as direct radiation ? No ! Thx
The challenge is to keep it compact . The lower octave box might be anywhere,not necessarily the one below,and the midrange (choose one of the three mids )could be a curved horn...
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Old 28th June 2010, 12:56 PM   #28
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Originally Posted by twest820 View Post
How would you manage phase in such a configuration? At least from the manual the DCX seems unsuited for more than three way due to the structure of its functional blocks and restriction to warped phase.
You've lost me there. Can you explain a bit more? My experience with the DCX has shown that any channel can be anything you want. Have you found otherwise?
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Old 28th June 2010, 01:22 PM   #29
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I can see a potential problem with the idea of using bandpass cabinets for lower midrange. Playing around on winISD, a bandpass cabinet tuned to 200Hz gives a huge peak (+14dB) at the tuning frequency, rolling off steeply at each side. This wouldn't sound good at all. Perhaps using small sealed boxes to give gain in the right place would be better?
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Old 28th June 2010, 03:10 PM   #30
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being cheap and playing with WinISD online I get a $6.00 CV over at Apex Jr. to~ fit the upper BP module - in real life where wavelengths are small, they're try to slip though the vent- a choke and Zobel might work
Click the image to open in full size.

Last edited by freddi; 28th June 2010 at 03:13 PM.
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