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Multi-Way Conventional loudspeakers with crossovers

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Old 11th October 2018, 05:39 PM   #191
Pida is online now Pida  Czech Republic
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They are all same (outter circumference of the surround), 6600, 7000, 7100, I had all of them physically mounted in WG148R and my WG.
R2004 and D2004 need 29-30mm, and again, they are same.

R 7000 in WG measurement is in the attachment, it is WG170mm, prototype, profile is not exactly what it should be as carpenter sanded too much. I should have new prototypes soon. Anyway, I hope it shows some potential for your application and development of your WG.

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Originally Posted by augerpro View Post
Pida> this is a ring radiator you're referring too? I have a hunch they are smaller diameter than the domes?
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File Type: png SS700 H 0-90 and DI no crossover.png (69.0 KB, 204 views)

Last edited by Pida; 11th October 2018 at 05:50 PM.
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Old 11th October 2018, 06:16 PM   #192
mbrennwa is offline mbrennwa  Switzerland
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How did you fit the WG148 to the Scanspeak?

Measurements look promising. What was the drive voltage and mic distance (--> sensitivity?) Baffle dimensions?
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Old 11th October 2018, 06:30 PM   #193
Pida is online now Pida  Czech Republic
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Measurement conditions:
- drive voltage not specified, I estimate ~2V
- mic distance 1m
- gatting window 3.6ms
- no smoothing
- measured in cabinet in the attachment, 220x460mm

To mount these scanspeaks to WG you have to remove the faceplate and make the saddle for tweeter which also centers it.
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File Type: jpg 20180714_144613.jpg (610.4 KB, 200 views)
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File Type: pdf WG148R mod for SS7100.PDF (37.6 KB, 32 views)
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Old 11th October 2018, 06:53 PM   #194
augerpro is offline augerpro  United States
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mbrennwa> it would be best to have one in-hand so I can make sure the design fits

Pida> You mentioned 38mm and 29-30mm, which is correct? 30mm would be promising. The 6600 family is not that small is it?
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Old 11th October 2018, 06:57 PM   #195
Pida is online now Pida  Czech Republic
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38mm throat diameter for R3xxx and D3xxx family (and R29xx) = 1" domes and ring radiators (6600, 7000, 7100) 29-30mm for R2xxx and D2xxx family = 0.75" domes and ring radiator (D2004/6020, R2004/6020)

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Pida> You mentioned 38mm and 29-30mm, which is correct? 30mm would be promising. The 6600 family is not that small is it?

Last edited by Pida; 11th October 2018 at 07:04 PM.
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Old 11th October 2018, 08:50 PM   #196
mbrennwa is offline mbrennwa  Switzerland
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Quote:
Originally Posted by Pida View Post
Measurement conditions:
- drive voltage not specified, I estimate ~2V
- mic distance 1m
- gatting window 3.6ms
- no smoothing
- measured in cabinet in the attachment, 220x460mm

To mount these scanspeaks to WG you have to remove the faceplate and make the saddle for tweeter which also centers it.
Ok, thats a bit more involved than the simple kitchen table approach that we have in mind to make the Monkey Coffin "novice friendly". But maybe the WG148 can be adapted to the Scan using easier tools, a bit like what I did here using the Monacor WG300. If a custom 3D printed waveguide is possible, that might be best.

How deep should the waveguide be? Would it make sense to align the voice coils of the tweeter and the midrange?
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Old 11th October 2018, 09:05 PM   #197
Aatto is offline Aatto  United States
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There are companies online providing different methods of 3D printing services (along w laser cutting, engraving ...) if one does not have direct access to a 3D printer.
I worked w Sculpteo before, very helpful and very affordable and also quick !
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Old 11th October 2018, 09:27 PM   #198
Pida is online now Pida  Czech Republic
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If the result of tweeter/WG combo is close to constant directivity, and dispersion is same for the midrange at crossover frequency, in that case I found LR4/LR4 more suitable. It results in almost perfect power response (based on horizontal measurement). Of course, when vertical response is included into equation, power response and DI have dip/bump at the crossover frequency.

For XT25 in WG300 + P17RCY I used LR2/LR2 which created smooth mid to tweeter transition, but for this combo DI is monotonically rising.

In both cases it is benefical to have tweeter acoustic center roughly aligned with midrange. It makes crossover modelling and obtaining good phase tracking easier.

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How deep should the waveguide be? Would it make sense to align the voice coils of the tweeter and the midrange?
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Old 12th October 2018, 09:32 AM   #199
mbrennwa is offline mbrennwa  Switzerland
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Quote:
Originally Posted by augerpro View Post
mbrennwa> it would be best to have one in-hand so I can make sure the design fits
Ok, here's how I see this... D.A.S. and Faital woofers and Volt VM752 mids are all ordered. Once I have them, I will do various measurements (as described in an earlier post). The directivity of the VM752 will tell us how to match the tweeter. If these data still show the same directivity as the aX measurements (I would be surprised if they didn't), we can go ahead an design a suitable waveguide/tweeter combination. Otherwise the Satori tweeter as in Pauls simulation study seems a good choice to me.

What do you guys think?
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Old 12th October 2018, 10:48 AM   #200
augerpro is offline augerpro  United States
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If you use a robust tweeter that can cross down 2khz or less, you probably won't need a waveguide with the Volt. I was just under the impression you guys wanted to cross higher.
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