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Multi-Way Conventional loudspeakers with crossovers

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Old 11th October 2010, 10:14 PM   #41
DQ828 is offline DQ828  Australia
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Quote:
Originally Posted by Rudolf View Post
I would look at it under two aspects:

1. Is the cone area (including the surround), which is hidden outside the slot, less than 20 % of the whole cone area? In that case I would not bother much.

2. At a crossover frequency < 200 Hz I don`t see any danger of interference.

Apart from that, in my POV, here we are talking about wet hair while sinking in the mid of an ocean.

Rudolf
Thanks for the advice.
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Old 12th October 2010, 01:22 AM   #42
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Originally Posted by DQ828 View Post
I was hoping that if Linkwitz could get great sound with 2 x 10" maybe I could get close with 2 x 12".
The Orion's a groundbreaking speaker but dipole design's progressed in the 10 years since its introduction, so I'd suggest caution in using it as a template.
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Old 12th October 2010, 02:11 AM   #43
DQ828 is offline DQ828  Australia
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Quote:
Originally Posted by twest820 View Post
The Orion's a groundbreaking speaker but dipole design's progressed in the 10 years since its introduction, so I'd suggest caution in using it as a template.
Can you point me towards information that I could read to get a better understanding of the subject?
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Old 12th October 2010, 05:28 AM   #44
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Hmm. Stig Erik's Open Baffle with Beyma TPL150 build thread and the Nao Note thread, both in this forum, have good representation of most of the equalization, baffle, and driver mounting evolution (with more modest SPL and bass extension requirements one can build a quite good nude swinging dipole with 16 fewer drivers than Stik Erik). A couple other points to be aware of are Seas woofers tend to have extra directivity designed in above 500Hz and H and U baffles are perhaps best regarded as poorly shaped horns. Both exacerbate the directivity issues of the Orion's baffle and I would also expect some horn honk. Can't say if there's enough honk to be a problem as the Hornresp simulations I did came out bad enough I chose to avoid a rectilinear baffle.
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Old 12th October 2010, 05:39 AM   #45
CLS is offline CLS  Taiwan
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Baffle hole smaller than cone? Yes, that's been done, a lot. Think Ripole bass.

Restricted area in front of the cone would load it slightly more than free air, so the fs would drop - a good thing. And then it forms a bandpass and restricts the higher range - depends on the application, mostly a good thing, too. If the restriction is too much, to a point, efficiency suffer - a bad thing.

So, it's OK to try.

But it's not helping to the 'bulkiness' I guess, no?
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Old 12th October 2010, 06:42 AM   #46
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You might want to check out my build.... see if that is interesting to you. You could easily use 12" instead of 10"

I'm really happy with it.

My fully active 4 way OB with 8 Drivers + 15" subwoofer
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Old 12th October 2010, 07:06 AM   #47
CLS is offline CLS  Taiwan
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Quote:
Originally Posted by DQ828 View Post
...

The other issue I have with Altec, is the pair of 15" I paid a lot of money for & a LOT of postage for get here from the US didn't live up to the description that the seller had on ebay, and he had a 100% reputation. I figure I shouldn't have that issue with new speakers, hopefully
Altec 416 is a highly regarded woofer.

However, operating on OB, it's a whole lot different from what it's designed for. Its intrinsic Q is too low for OB.

If this major point isn't solved, you won't have much luck in other woofers.


For your reference:

'T'-bass drive for OB LF drivers.

Low Q Woofer in OB with High Zo Amp
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Old 12th October 2010, 08:12 AM   #48
DQ828 is offline DQ828  Australia
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Quote:
Originally Posted by sanedesign View Post
You might want to check out my build.... see if that is interesting to you. You could easily use 12" instead of 10"

I'm really happy with it.

My fully active 4 way OB with 8 Drivers + 15" subwoofer
I have been following your thread with interest. Keep up the good work.

In the first instance I was to stay passive 3 way, then go active depending on funds & success levels. One thing at a time.
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Old 12th October 2010, 08:15 AM   #49
DQ828 is offline DQ828  Australia
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Default Thank you all

Thanks for your input everybody, the more the merrier.

david
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Old 12th October 2010, 06:25 PM   #50
Helmuth is offline Helmuth  Netherlands
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Found a hefty pro 12" xmax 11,5mm 490*1,15 = 563cm^3.

http://www.speakerstore.nl/luidsprek...df/12.00SW.pdf
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