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Multi-Way Conventional loudspeakers with crossovers

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Old 12th March 2004, 01:22 PM   #1
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Default First speaker design...suggestions? And some pretty CAD pics :)

Hello everyone,
This is my first speaker design, so just experimenting at the moment really.

The tweeter and the mid both have there own compartments in the cabinet, and the mid is a propper dedicated mid, so I don't think this requires a specially designed enclosure, though apparently a 1.5l moulded specially shaped enclosure is available for this driver.

The top bass is sealed and has an optimised volume. The bottom bass driver however I think is intended for installation in sealed applications, however according to WinISD this driver has an extremely low extension (down below 22Hz @ -3dB) if used ported. It seems due to the nature of the driver that this requires a very large enclosure for this to work, perhaps this is why commercial speaker manufacturers don't normally do this? I think it's worth a go for a DIY project though.

Any thoughts or suggestions would be very much appreciated on this as I am a beginner!!!

Thanks everyone,
Steve
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Old 12th March 2004, 01:24 PM   #2
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These have 20mm granite front, and the driver trumpets are machined from billet aluminium. Any thoughts on how these will sound?
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Old 12th March 2004, 01:26 PM   #3
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And this is them next to a door, to get an idea of size. Theyre 1650mm tall, any thoughts on how the tweeters will sound so high up?
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Old 12th March 2004, 01:37 PM   #4
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How they will sound depends on lots of different things, but I know my girlfriend wouldn't approve if I would speakers this big into the living room!! :-)
But if low WAF designs are your thing then this could be a starting point. I wouldn't make the "trumpets"out of aluminium though, try wood.

Greetings,

Jarno.
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Old 12th March 2004, 01:47 PM   #5
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low WAF? Yes we were a bit unsure as to what material to make the trumpets from, so we're going to try both. I originally chose ally just because it would match the black granite nicely, for colour and texture, but if it would be detrimental to the sound i suppose it would be a bit rude to use it anyway. The size was a bit of a problem, hehe, we had to have a few redesigns and rethinks to make sure it would go through the door
Thanks for the reply!!
Steve
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Old 12th March 2004, 02:12 PM   #6
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Ideally, the tweeter should be at ear level in the normal listening position. I'm guessing the acoustic center of the tweeter is 1500mm or something... When sittingl, it's going to be over your head.
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Old 12th March 2004, 03:00 PM   #7
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I would probably relocate the ports to the rear so the port
noise is less audible and I think it would look nicer. Just keep
the speakers a small distance from the back wall so the port has
breathing room. /hehe
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Old 12th March 2004, 04:35 PM   #8
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Thanks again for all your replies.

Quote:
Ideally, the tweeter should be at ear level in the normal listening position
so swap the tweeter and the mid over perhaps? neither of these need any cabinet volume as such, so shouldnt be a problem

Quote:
I would probably relocate the ports to the rear so the port noise is less audible and I think it would look nicer
i agree they would look nicer, but not really that practical as the speakers are 650mm deep, so the closer they can be to the wall the better unfortunately

Thankyou
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Old 13th March 2004, 11:16 AM   #9
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I wouldn't put those trumpet-bell things around the tweeter or midrange as it may have a horn-loading effect at high-frequencies, which you want to avoid - either make a genuine horn or leave it flat. Tweeters tend to be very directional at high frequencies anyway, which would make modelling a horn (in Hornresp or something like that) very inaccurate anyway.

Remember soft-mounting of tweeters and midrange: don't bolt them down with tempered steel and 2-part epoxy!

I only just noticed that it's a 4-way design, not a 3-way design with dual woofers. May I suggest that you rethink some of the sizes of the speakers? I don't know what the exact sizes are from what you said, but it looks like 1" tweeter, 6.5" midrange, 10" woofer, 12" subwoofer. IMO most 6.5" midranges are far too big if they don't have to do frequencies below say 200Hz, and they often struggle with cone resonances above 1kHz. In most cases 12" speakers can do anything 10" speakers can do, except some high frequencies.

How about a 1" tweeter, 5" midrange, 8" midwoofer, and 12" subwoofer? The midrange is then likely to have better sound at the oft' neglected 1kHz to 5kHz range, as for an 8" + 12" combo, boy that'll be some good bass! In an internal sealed enclosure the 8" speaker is the perfect size for handling the "punchy" midbass, while leaving the truly low stuff to the 12" speaker.
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Old 13th March 2004, 04:54 PM   #10
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The sizes are 1", 5.5", 8" and 10". we did originally try a 12", but the enclosure got far too big with a ported layout!! As it is the response simulated goes down below 25Hz at -3dB, and only begins rolling off at around 28-29Hz.

All those trumpets are only 1" radius, would this be enough to make any horn loading effects audible? What would the effect of horn loading be anyway?

Why do tweeters and mids need to be soft mounted? Its not a problem to do at all, but I just cant think why that would be a good thing....surely the only part you would want to be moving is the dome/cone? Wouldnt soft mounting mean that the whole driver could vibrate and colourise the sound somehow?

Were planning on using seas drivers, we simulated peerless as well, but these didn't come out quite so good and theyre a little more expensive. Any thoughts or experiences with these drivers from anyone? I doubt these will be the final version of these speakers anyway, lots of experimenting to be done after weve built them!

Any thoughts on how downward firing ports would sound? The gap between the speaker and the crossover on the bottom is 1", though this could be easily increased by using larger pillars. Hopefully this is clear in the picture. Im just really not keen on rear firing ports as they will take up at least 3foot of space out from the wall. And they look a bit ugly on the front, though the look may grow on me a bit yet.

Thankyou everyone!
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