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Multi-Way Conventional loudspeakers with crossovers

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Old 8th September 2007, 04:38 PM   #1
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Maybe this has been suggested before but I have an idea that would be very informative. Perhaps we could start a thread that just consisted of DIY speakers that would contain the following:

A picture of the speakers
Dimensions
Freq graph both on axis an 30 degree off, (measured at tweeter height)
Distortion graphs at some drive level, say 75 dB
Power compression graphs every 10 dB
all measurements at 1m with specified gating, etc.

I know that there is a thread that shows various projects but the info is all over the map.

Having a thread like this could be very revealing for pro systems in that it could show the limitation of standard speakers with regard to power compression as well as show that they can hold their own in the other catagories, (i.e. distortion, flat freq response, etc.)

In addition, if you haven't measured one of these parameters it may be very revealing to you as well.

Note that there is no bias in something like this. One can debate the relative importance of one spec over another but as long as all the data is there one can draw one's own conclusions.

What say you all? Now's your chance to really show off!
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Old 8th September 2007, 06:04 PM   #2
EC8010 is offline EC8010  United Kingdom
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Here's your thread. You now have to wait while I design and build a microphone amplifier, wait for my new jigsaw and 18" bass drivers to be delivered, find somewhere that stocks 28mm plywood, then build my three-ways.
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Old 9th September 2007, 09:40 PM   #3
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There are several well documented projects with measurements at Zaph | Audio.
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Old 9th September 2007, 09:48 PM   #4
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Quote:
Originally posted by Phil Olson

all measurements at 1m with specified gating, etc.
How about a bit further out then 1 m?

dave
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Old 10th September 2007, 02:28 PM   #5
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I think he is asking about members builds, not necessarily things like Zaph or Humble homemade hifi.

htguide.com/forums has a "Mission Accomplished" section that is documented builds. Might be nice if DIYaudio has one as well.
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Old 10th September 2007, 11:01 PM   #6
schauki is offline schauki  Austria
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Like that:
Click the image to open in full size.

HxWxD
920x400x450

Freq. Graph off axis response:

Click the image to open in full size.
On axis response is only a klick in the EQ. I can make nearly all respons curves.

THD Plot at ~100dB:

Click the image to open in full size.

and at ~110dB:

Click the image to open in full size.
In this case its possible that the Mic-Pre was on clipping.


Power Compression... i've had never measured over 120dB SPL, because my SPL Meter only comes up to 120dB SPL.
In Freq Graph there is no different.


Hope you like this, and am sorry again for my poor english. I think i must go to an english course.

schauki

P.S. klick on pictures for lager view
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Old 11th September 2007, 05:37 AM   #7
EC8010 is offline EC8010  United Kingdom
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Interesting loudspeakers (and stands). What is the purpose of the unusual elliptical routed profiles in front of the midrange and tweeter domes?
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Old 11th September 2007, 05:43 AM   #8
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Waveguides?

dave
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Old 11th September 2007, 03:32 PM   #9
schauki is offline schauki  Austria
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Hi!
Yes it's a waveguide.
(full project description in in this forum)

mfg
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Old 12th September 2007, 07:45 AM   #10
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Nice speakers.
The woofers and mids look like ATC.

Regards

Charles
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