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Multi-Way Conventional loudspeakers with crossovers

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Old 1st August 2009, 08:24 PM   #1621
ScottG is offline ScottG  United States
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Quote:
Originally posted by cnclld


There's more to it than vent positioning. The vent area, positioning, enclosure size and the amount of resistance in the ports all have their effect on the radiation pattern. In short, directional enclosures must be smaller and have less resistive ports than low-frequency enclosures to have enough output from the ports across the whole frequency range to control directivity.
I understood, I was just adding to. (..though I should have clarified that the large enclosure volume was not primarily striving for pattern control.)

The mid-range pattern control is something I recently recommended for use with CD-type waveguides. It's need for a smaller enclosure/low loss resistance relates to a need for increased pressure for the reverse-phase wave. Altering not simply the volume of the enclosure, but particularly the depth of the enclosure alters the level of pressure for this reverse-phase wave at differing freq.s. (i.e. less depth generally equals greater pressure at higher freq.s.)
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Old 1st August 2009, 09:06 PM   #1622
LIFU is offline LIFU  Switzerland
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Its the Morel EM1308.




Best Regards,

Gustav
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Old 2nd August 2009, 04:50 PM   #1623
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My Pluto speakers. Designed by http://www.linkwitzlab.com/index.html build by me.
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Old 10th August 2009, 11:37 AM   #1624
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Ok, here goes my (updated) system.

2x Mission 760i (mains)
1x Wharfedale Modus (centre speaker)
2x cheap 2-way speakers (rears)
1x Sub (2 DVC 8"s 42L, LT to f3@ 28Hz)

Powered by: All-in-one 2x75W stereo (mains)
Cambridge Audio A1, with Beefed up PSU, destroyed tone controls (used as XO and sub level) - sub and centre
Something old I pulled out of the loft - Rears.

Total system power 270W, Modelled frequency response - -3dB at 28Hz, not sure on upper limit, probably on the Missions... Talking of which... Those Missions had typical Mission syndrome, where they sound good from 2 months old to 2 years old, after which they sound tired. So, after fiddling with the XO circuit - there was a resistor going to the tweeter, which I put in parallel with a few more, using trial and error, and I got it right-ish.

My old, SPL based system consisted of 2x 3 way pioneer speakers (8" paper cone, 4" mid, 2" tweeter) and a pair of sony 3-ways, with a 6" woofer. Both pairs older than me, passed on from neighbours who'd heard I was into speakers.

Not bad for a 15 year old, eh?

Chris
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Old 10th August 2009, 08:49 PM   #1625
Pato666 is offline Pato666  Argentina
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lovely!
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Old 12th August 2009, 06:47 PM   #1626
ahegyes is offline ahegyes  Romania
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LIFU , that is some realy sic stuff. No comment.
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Old 22nd August 2009, 02:28 PM   #1627
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Here is my current HT/Music system. Speakers are omni with vifa drivers (P17 + D25) passive crossover 2nd order @ 3.5k. Subs are 12" Rythmik sealed servo crossed at 80 Hz 4th order.

I use ultracurve for eq full range. This is a snapshot of typical settings to get it flat (see first snapshot)

then my "house curve" added to that: (second snapshot)

The current omnis are in prototype form, and I'll replace them with serious boxes later.

You can also see my current bandpass experiment with the vent removed.

About the omnis. Most of the vocal range is omni - below 1k. Above 1k they are omni in the horizontal plane only, so between 1k and xo @ 3.5k there is more sound directed at the ceiling. Above the crossover point it's probably not really omni due to the baffle. Subjectively I find as moving around the room, the midrange retains a very consistent character. I get the big sweet spot and sound stage of open baffles.

These speakers are an experiment, but I've decied to leave them in my system for a while. Normally I have OB prototypes.

There is more info on all this on my blog:

http://redspade-audio.blogspot.com/2009/08/welcome.html

Edit: sadly the pics don't seem to be working - probably due to blogspot image restrictions, but they are all there in the blog, and included as attachments.
Attached Images
File Type: png HT-01s.png (181.2 KB, 2670 views)
File Type: jpg omni-bandpass-01.jpg (16.1 KB, 2591 views)
File Type: png ultracurve-geq-01.png (42.2 KB, 2516 views)
File Type: png ultracurve-peq-01.png (38.8 KB, 2279 views)

Last edited by paulspencer; 22nd August 2009 at 02:37 PM.
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Old 22nd August 2009, 09:02 PM   #1628
ScottG is offline ScottG  United States
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Quote:
Originally Posted by paulspencer View Post
Here is my current HT/Music system.
Nice!

I tried to post some comments on your site and they didn't quite make it..

Basic thoughts on design alterations are:

1. Use an eff. midrange in a moderate volume with a low tuning freq.. and no stuffing or wall lining. That should give you the clarity you are looking for. The B&C 6MD38 should work out well with it's rising response on axis up to 1.7 kHz, its overall smaller diameter (for an eff. midrange), and its eff. which will be "cut" on the listening axis by about -7 to -8 db (85 deg.s off-axis).

2. Consider the BG Neo 3PDR as a DIPOLE for the tweeter. (GR Resarch still has these with an open back). Use stuffing/padding on the tweeter baffle to absorb baffle effects.

3. Use a good eff. mid-bass driver (regardless of open baffle or enclosure). It still makes a substantial difference.

Anyway, nice write-up!
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Last edited by ScottG; 22nd August 2009 at 10:05 PM.
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Old 23rd August 2009, 06:28 AM   #1629
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Thanks Scott! I didn't know there was a problem with adding comments to my blog. Was there an error message?

The system as shown is experimental and temporary. I've looked at some efficient drivers along similar lines as an upgrade, although at this stage I'm looking at a Geddes Abbey approach, mains then becoming surrounds. AE drivers also have my attention.
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Old 23rd August 2009, 07:27 AM   #1630
ScottG is offline ScottG  United States
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Quote:
Originally Posted by paulspencer View Post
Thanks Scott! I didn't know there was a problem with adding comments to my blog. Was there an error message?

The system as shown is experimental and temporary. I've looked at some efficient drivers along similar lines as an upgrade, although at this stage I'm looking at a Geddes Abbey approach, mains then becoming surrounds. AE drivers also have my attention.

I don't remember exactly what happened, though I do remember that drop down list and it quickly "barfing" after that with no way to retrieve the post by hitting the "back" button. (..I know, should have copied it to clip board before trying to post.)

If you are primarily interested in L&R HT loudspeakers then I think that Earl's approach is excellent. If you are more interested in music, then I'd suggest continuing "down" the radial "path".
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