Hi all,
I have been working with EdL (thanks Ed) for the last couple weeks in preparing to measure some DIY WGs for use with non-compression drivers. That is, the tweeters will be standard off-the-shelf dome tweeters. Ed has turned some examples and sent them to me. Soon I will be doing some measurements (I have to go out of town for work). The measurements and related WG profiles will be posted as done.
We are currently shooting for a guide to match the RS 180 7" Dayton MidWoofer. The principle idea being to control the sound field to match the RS 180 at crossover and to provide low end boost so that the crossover can be below 1200 Hz without heroic crossover designs.
At this stage of the game we are still not certain where a good foundation would be for a base line WG to compare results against. Since there are many of you out there that have seen and heard (and hopfully measured :T ) Genelec, Amphion, SP Tech, or other fine high quality WGs for dome tweeters, we are asking for some help.
So, has anyone out there physically measured any commercially successful Wave Guides for dome tweeters or have a well founded opinion of how they should be shaped and sized?
From looking at pictures of commercial WGs (and seeing the SP Tech speakers but not measuring them) it seems that basic dimensions for RS 180 use might be 7" to 7.5" mouth diameter, throat to match the tweeter used, and a conical flair rate of perhaps 100 deg (more? less?) total included interior angle for the Guide.
Can anyone confirm or deny these basic assumptions?
How about measured round-over radius at mouth and throat?
Does anyone have any actual physical measurements?
If you have taken physical measurements or acoustical measurements, please describe what it was you measured. Right now Zaph has the only data I am aware of. Great work Zaph! :T
If you wish to provide an opinion, please give a commercially successful example product that uses a standard dome tweeter and solid support (perhaps acoustic measurements?) for the opinion.
BTW we do not intend to clone someone else's work. But we would like to start at a good point and develop what we feel works for us.
We hope that with a little help from our friends we can find and deliver some useful data for our own projects and for the DIY community. Hope you can help.
Thanks everybody :T
P.S.
Attached is a pic of one of the WG's we are working on. It is sporting a Vifa silk dome. Can't wait to measure it!
I have been working with EdL (thanks Ed) for the last couple weeks in preparing to measure some DIY WGs for use with non-compression drivers. That is, the tweeters will be standard off-the-shelf dome tweeters. Ed has turned some examples and sent them to me. Soon I will be doing some measurements (I have to go out of town for work). The measurements and related WG profiles will be posted as done.
We are currently shooting for a guide to match the RS 180 7" Dayton MidWoofer. The principle idea being to control the sound field to match the RS 180 at crossover and to provide low end boost so that the crossover can be below 1200 Hz without heroic crossover designs.
At this stage of the game we are still not certain where a good foundation would be for a base line WG to compare results against. Since there are many of you out there that have seen and heard (and hopfully measured :T ) Genelec, Amphion, SP Tech, or other fine high quality WGs for dome tweeters, we are asking for some help.
So, has anyone out there physically measured any commercially successful Wave Guides for dome tweeters or have a well founded opinion of how they should be shaped and sized?
From looking at pictures of commercial WGs (and seeing the SP Tech speakers but not measuring them) it seems that basic dimensions for RS 180 use might be 7" to 7.5" mouth diameter, throat to match the tweeter used, and a conical flair rate of perhaps 100 deg (more? less?) total included interior angle for the Guide.
Can anyone confirm or deny these basic assumptions?
How about measured round-over radius at mouth and throat?
Does anyone have any actual physical measurements?
If you have taken physical measurements or acoustical measurements, please describe what it was you measured. Right now Zaph has the only data I am aware of. Great work Zaph! :T
If you wish to provide an opinion, please give a commercially successful example product that uses a standard dome tweeter and solid support (perhaps acoustic measurements?) for the opinion.
BTW we do not intend to clone someone else's work. But we would like to start at a good point and develop what we feel works for us.
We hope that with a little help from our friends we can find and deliver some useful data for our own projects and for the DIY community. Hope you can help.
Thanks everybody :T
P.S.
Attached is a pic of one of the WG's we are working on. It is sporting a Vifa silk dome. Can't wait to measure it!
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