DIY projects with pictures and measurements

Phil Olson · 8th September 2007, 04:38 PM

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!

EC8010 · 8th September 2007, 06:04 PM

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.

gmilitano · 9th September 2007, 09:40 PM

There are several well documented projects with measurements at Zaph | Audio.

planet10 · 9th September 2007, 09:48 PM

Quote:

Originally posted by Phil Olson

all measurements at 1m with specified gating, etc.

How about a bit further out then 1 m?

dave

s7horton · 10th September 2007, 02:28 PM

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.

schauki · 10th September 2007, 11:01 PM

Like that:

HxWxD
920x400x450

Freq. Graph off axis response:

On axis response is only a klick in the EQ. I can make nearly all respons curves.

THD Plot at ~100dB:

and at ~110dB:

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

EC8010 · 11th September 2007, 05:37 AM

Interesting loudspeakers (and stands). What is the purpose of the unusual elliptical routed profiles in front of the midrange and tweeter domes?

planet10 · 11th September 2007, 05:43 AM

Waveguides?

dave

schauki · 11th September 2007, 03:32 PM

Hi!
Yes it's a waveguide.
(full project description in in this forum)

mfg

phase_accurate · 12th September 2007, 07:45 AM

Nice speakers.
The woofers and mids look like ATC.

Regards

Charles

8th September 2007, 06:04 PM	#2
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	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. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

9th September 2007, 09:40 PM	#3
gmilitano diyAudio Member Join Date: Apr 2004 Location: Winnipeg, Manitoba	There are several well documented projects with measurements at Zaph \| Audio. __________________ DIY Audio Projects [ 10" DIY Subwoofer \| FE127E Sealed Bipole \| [ LM3886 Chip Amp / Gainclone \| K-12M Tube Amp Kit ]

11th September 2007, 05:37 AM	#7
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	Interesting loudspeakers (and stands). What is the purpose of the unusual elliptical routed profiles in front of the midrange and tweeter domes? __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

11th September 2007, 05:43 AM	#8
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	Waveguides? dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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8th September 2007, 04:38 PM	#1
Phil Olson diyAudio Member Join Date: May 2006	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!

10th September 2007, 02:28 PM	#5
s7horton diyAudio Member Join Date: Oct 2006	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.

10th September 2007, 11:01 PM	#6
schauki diyAudio Member Join Date: Aug 2006	Like that: HxWxD 920x400x450 Freq. Graph off axis response: On axis response is only a klick in the EQ. I can make nearly all respons curves. THD Plot at ~100dB: and at ~110dB: 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

11th September 2007, 03:32 PM	#9
schauki diyAudio Member Join Date: Aug 2006	Hi! Yes it's a waveguide. (full project description in in this forum) mfg

12th September 2007, 07:45 AM	#10
phase_accurate diyAudio Member Join Date: May 2002 Location: Switzerland	Nice speakers. The woofers and mids look like ATC. Regards Charles

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