I am looking to build a 3 way pa top with 60x40 dispersion so two cabs can be splayed side by side. I already have a few ME60 horns and some 15” drivers from a couple old carvin Trx 215n and friend gave me. Basically I would get two more ME60 horns and build two more cabs to split the woofers between a them and use an 8” midrange with a wave guide. I cannot find much information for designing a waveguide. Is it as simple as angling the sides out from the cone at the desired angle or is there more to it such as the length of the guide relative to the bandwidth?
There does exist buyable options, look into JBL's 60x40 midrange waveguides used with the CMCD82H (2169H).
There is also a older version utilizing the M209-8A (similar to the 2118 and 2119 8").
as for waveguide design there are people on here better on it then me
There is also a older version utilizing the M209-8A (similar to the 2118 and 2119 8").
as for waveguide design there are people on here better on it then me
@Arez
Yes I am familiar with a jbl 8” midrange wave guide #5047486 used with the #2107 driver. The wg is only like $55 so that’s no issue. I am just not sure how a wave guide would act being used with a different driver. I would like to use the B&C 8NSM64 as i may choose to get some limmer 870qx horns later and this is what they call for.
@AllenB
The dispersion I am looking for is 60w x 40h
The jbl srx835 crosses the 8” mid range at 330hz to 2.4khz so I would start near here. Keep in mind I would have two cabs splayed per side.
Yes I am familiar with a jbl 8” midrange wave guide #5047486 used with the #2107 driver. The wg is only like $55 so that’s no issue. I am just not sure how a wave guide would act being used with a different driver. I would like to use the B&C 8NSM64 as i may choose to get some limmer 870qx horns later and this is what they call for.
@AllenB
The dispersion I am looking for is 60w x 40h
The jbl srx835 crosses the 8” mid range at 330hz to 2.4khz so I would start near here. Keep in mind I would have two cabs splayed per side.
Indeed, but the wider dimensions are not of as much concern. The JBL is not intuitive and doesn't look like something to learn the basics from. Perhaps they used a diffraction trick to extend the low end, aka secondary flare.. Waveguide design is not a small topic.
Your question appears to be appropriate for PA Systems or would you like to continue in Multi-Way, let me know if you want to move the thread.
Your question appears to be appropriate for PA Systems or would you like to continue in Multi-Way, let me know if you want to move the thread.
@AllenB
I tried some searching for basics on waveguide design and didn’t come up with much for midrange use. But from your comment it sounds more involved than just angled sides in the general pattern which I expected. I was just hoping it would be simple compared to horn loading. Any direction you think I should go is ok with me if you would like to move it to a more appropriate thread.
Thank you,
I tried some searching for basics on waveguide design and didn’t come up with much for midrange use. But from your comment it sounds more involved than just angled sides in the general pattern which I expected. I was just hoping it would be simple compared to horn loading. Any direction you think I should go is ok with me if you would like to move it to a more appropriate thread.
Thank you,
There is fair design activity in Multi-Way, but the constraints are quite different for PA. What I'll do is move the thread but leave a temporary redirect so in effect it will be in both sections.
I would suggest using an exponential or even a conical vertical expansion rate. Conical profiles are easy to modify and adapt to specific coverage based mainly on the throat entrance angle. I'm not claiming to be an all out expert on this subject, but I've looked at similar designs and borrowed some aspects which i feel were applicable to my needs. Ie. The Edgar as well as the Inlow midbass horn designs use a Tractrix expansion profile and look like they can be modified to suit your needs.
As far as most of my experience with midrange horn design using cone drivers, the more gain you want makes it significantly more complicated in terms of predicting directivity, but at low compression ratios and without any appreciable diffraction, it's easy to control the vertical angle right at the WG entrance. I've used the JBL MRX version of mid WG and found it to be much too shallow and wide in pattern.
As far as most of my experience with midrange horn design using cone drivers, the more gain you want makes it significantly more complicated in terms of predicting directivity, but at low compression ratios and without any appreciable diffraction, it's easy to control the vertical angle right at the WG entrance. I've used the JBL MRX version of mid WG and found it to be much too shallow and wide in pattern.
From the opening angle, the dispersion will be very narrow, about 35-40°. The main problem you'll have about that is that it doesn't have a phase plug, which means, the top end of it will cease at about ~2kHz at best, likely much below that, to my experience at 1-1,5kHz. That means, it's useful maybe for a coax driver or not getting any actual benefit over it since you need a CD like on a 12" without a horn.