Here are some options for 3" domes:
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Anyone have any experience with horn loading any of those drivers?
I’m wondering how to determine which would perform best with horn loading?
I’m not sure how much success I would have with plugging manufacturers data into hornresp using an approximation of the horn.
The Volt already comes with a truncated horn/wavguide…whatever that’s worth…I would hope its removable?
I’m wondering how to determine which would perform best with horn loading?
I’m not sure how much success I would have with plugging manufacturers data into hornresp using an approximation of the horn.
The Volt already comes with a truncated horn/wavguide…whatever that’s worth…I would hope its removable?
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Yes, the waveguide of the Volt 752 is removable. You can make your own but, the mounting flange and the WG are both in the same block.
Attachments
Problem is the horn throat creates changes in pressure which in turn slows the driver with acoustic resistance which translates to the actual driver impedance which then yields a resonance. The softer the material the radiating surface is, the greater the number and amplitude of resonances created.……..it’s always a tradeoff.
It was not meant in the meaning I would expect 18M to perform better ot that 12MU would not be good. 18M would just the midrange option for the projects requiring larger midrange.
I will rephrase it on my website, I understand it might be confusing.
The kind of profiles that work well with midrange domes, like conical and circular radius's do not do much to increase the radiation resistance. To get any kind of significant resonance the profile would have to be like a straight duct or exponential. What is happening is a reduction in solid radiation angle increases the output within that angle.
The softer the material the less predictable the output will be as the driver will not be pistonic, but it will not automatically cause more or stronger resonances.
Yes, highly dampened soft domes are not well suited to horn loading. I tried this with the D7608 and it fell on its face. Not a good candidate for this purpose.
Perhaps one of the Hivi domes with their deeper dome profile would be more suited to a horn. They tend to use stiffer domes in these mids, which is what you're after.
The D54 happens to work well because it has a massive motor and a fairly rigid dome for being a cloth dome. The coating makes a difference here as well as the VC inductance. The Volt 752/753 is definitely a candidate for this as well.
Perhaps one of the Hivi domes with their deeper dome profile would be more suited to a horn. They tend to use stiffer domes in these mids, which is what you're after.
The D54 happens to work well because it has a massive motor and a fairly rigid dome for being a cloth dome. The coating makes a difference here as well as the VC inductance. The Volt 752/753 is definitely a candidate for this as well.
Just out of curiosity: does anyone know whether the ATC and Volt dome assemblies are made by Dr. Kurt Muller, and if so, is there a trick to get those somewhere and somehow, working outside the usual rip off schemes of those builders?
Thanks for all the feedback regarding using domes in horns guys.
It’s interesting to note the comments regarding dome rigidity playing a roll in how they might perform when used like this.
When I pulled the D54s out to look them over there was a little “schmutz” on one that I cleaned up with some watch maker’s Rodico. Only then did I realize how delicate the dome was…it flexes very easily.
I need to find time to mount the D54s on the Edgar horns and take measurements to see how they perform.
So far, I have only mounted a pair of Radian 760pb neo.
I was disappointed with the Radian’s performance in these horns. There was suckout between 2-3kHz and their HF extension fell short of what I was hoping for.
I’m hoping the D54 will be better even if their HF extension is still limited.
When considering the 3” conical horns and experimenting with domes in them I would say the HiVi drivers would be a possibility because of their price point. I doubt I would roll the dice on the Volts unless I found a used pair at a good discount.
One idea that popped back into my head in thinking about this is something I read about removing the back cover on CDs and mounting them backwards on the horn so they radiate as a dome into the throat. I’ll have to try and find that information again.
It’s interesting to note the comments regarding dome rigidity playing a roll in how they might perform when used like this.
When I pulled the D54s out to look them over there was a little “schmutz” on one that I cleaned up with some watch maker’s Rodico. Only then did I realize how delicate the dome was…it flexes very easily.
I need to find time to mount the D54s on the Edgar horns and take measurements to see how they perform.
So far, I have only mounted a pair of Radian 760pb neo.
I was disappointed with the Radian’s performance in these horns. There was suckout between 2-3kHz and their HF extension fell short of what I was hoping for.
I’m hoping the D54 will be better even if their HF extension is still limited.
When considering the 3” conical horns and experimenting with domes in them I would say the HiVi drivers would be a possibility because of their price point. I doubt I would roll the dice on the Volts unless I found a used pair at a good discount.
One idea that popped back into my head in thinking about this is something I read about removing the back cover on CDs and mounting them backwards on the horn so they radiate as a dome into the throat. I’ll have to try and find that information again.
Is this the reason why compression drivers tend to use stiff diaphragm materials like phenolic resin, aluminum, and titanium ?
j.
Member
Joined 2003
There's also the "compression" aspect of compression drivers that puts extra force on the diaphragm.
what we could really do with is someone who owns a 3inch dome preferably the volt one to run some measurements with and without the volt horn and maybe with a different horn see what difference it makes . I'd be willing to chip in some money and buy a volt 3inch between a few of us and have it sent to a member who knows what they're doing ( not me hopefully I have a uMic and r.e.w. but haven't worked it out yet ) if we had say 10 members wouldn't be so bad
I really like the look of the VM527, I already have a pair of BM2500.4 and a D2004/6020 (to keep the spacing as small as possible) to go with them but I can't really commit due to the high price!
https://audioxpress.com/article/test-bench-volt-loudspeakers-vm527-midrange
https://audioxpress.com/article/test-bench-volt-loudspeakers-vm527-midrange
Those two above seem like the best options at the moment. I consider the Belisma and Volt to be so over-priced they are not valid choices, lol.
I'd love to see more measurements of the DM-7500, from the small sample I've seen it looks like a beast to compete with ATC and Volt. The TangBand is superb in the midrange but at the lower-mid where you might want to cross over to a larger woofer it struggles a little compared to the old ATC.
The small Hi-Vi DMB-A is a stellar budget midrange. It competes with some of the best 4" mid-woofers in midrange performance, but does need to cross at 600Hz or above.
I've seen them for about £250 I don't thinks that's the end of the world if they're world class