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18th January 2010, 12:30 PM
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#1 |
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diyAudio Member
Join Date: Mar 2004
Location: Melbourne, Australia
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My Apollo project underway
Well its been fairly quiet around here so I thought I spice things up a bit.
This is my 4-way Apollo project which I'm about to begin construction on. Because I hate to use bass management (routing bass to a subwoofer), these will be full range (-3dB@25Hz), using bi-amping & EQ on the bass driver. Drivers will be -: Tweeter - Seas T29MF001 E0047 Magnum . Details  Midrange - Scanspeak 12MU/4731T00 Details  Bass-mid - Scanspeak 18WU8741T00 Details  Woofer - Seas L26ROY Details  Here are a few sketches. Overall dimensions will be 52cm x 125cm x 30cm (whd)       I'm guessing this will take about 3-4 months depending on the weather and my workload. Stay tuned for updates ! Last edited by David Gatti; 18th January 2010 at 12:32 PM. |
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18th January 2010, 12:52 PM
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#3 |
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diyAudio Member
Join Date: Mar 2004
Location: Melbourne, Australia
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At this stage I'm aiming for 150Hz, 800Hz, & 3kHz.
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18th January 2010, 12:54 PM
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#4 |
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diyAudio Member
Join Date: Feb 2008
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Looks very interesting!
Don't forget the pictures 
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18th January 2010, 01:07 PM
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#6 | |
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diyAudio Member
Join Date: Mar 2004
Location: Melbourne, Australia
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Quote:
The preliminary simulations I've done show the floor bounce isn't too problematic, with the big Seas woofer filling in the floor bounce and baffle-step losses. 
Last edited by David Gatti; 18th January 2010 at 01:13 PM. |
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18th January 2010, 01:12 PM
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#7 |
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diyAudio Member
Join Date: Feb 2008
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You should build a simple protoype and measure it.
 What software do you use that can simulate in-room response including early reflections? I think your simulation is a bit optimistic also, considering that your woofer has only 80 dB sensitivity in 4pi.
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dipoles dipoles dipoles dipoles dipoles dipoles dipoles dipoles and dipoles |
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18th January 2010, 01:22 PM
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#8 |
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diyAudio Member
Join Date: Mar 2004
Location: Melbourne, Australia
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I'm using LspCAD.
Keep in mind the woofer is actively driven, and will have EQ. I've done previous designs of a similar nature, so I know what to expect in regards to room effects, mainly a dip around 150Hz. I guess it's similar in concept to a Vandersteen 5a . Last edited by David Gatti; 18th January 2010 at 01:30 PM. |
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18th January 2010, 01:28 PM
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#9 |
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diyAudio Member
Join Date: Feb 2008
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Ah.. then its no problem, you can just boost it a little bit
I like those angled edges, they keep diffraction under control. Will the top and bottom boxes be isolated from each other, or will they have close contact?
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dipoles dipoles dipoles dipoles dipoles dipoles dipoles dipoles and dipoles |
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18th January 2010, 09:26 PM
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#10 |
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diyAudio Member
Join Date: Mar 2004
Location: Melbourne, Australia
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Isolation - some felt maybe. Any suggestions?
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