Could you please post distortion graphs from those pdn 12"
if you have REW take about 90db from close and 1meter handheld sweeps
for the reference 12" bms: https://dl.dropboxusercontent.com/u/33080121/hifi/pikkujoulu/12n820.mdat
if you have REW take about 90db from close and 1meter handheld sweeps
for the reference 12" bms: https://dl.dropboxusercontent.com/u/33080121/hifi/pikkujoulu/12n820.mdat
Last edited:
Hello, I have a interest in the SLOBS - they appear to be some sort of bass dipole. Is that correct? What range do these work and is it something I can do with say eight mid QTS HE 15's? Is there a post or website that explains this concept you can point me to? Thanks 🙂
The text doesn't tell all. Where do you expect the new PD's to fit in? Looking at specs I see some xover changes possibly.
Since you started talking about these over 6 months ago this is a very calculated move. Do you know someone with these drivers or was it a lot of reading that pointed you in this direction?
Thanks for sharing your experience.
Grant.
Make a search for Nelson Pass and Slob and you should find his article on them!
They are a bass dipole with compression in the "front". In my room I have them playing from 25 and upwards to 130Hz. 200Hz also seems to be fine, but that is starting to strech it. In my new system they will be crossed over at 80-90Hz depending on the inroom response of the new midbass horns.
The PD's will fit into my new midbass horn design, two on each side. They will cross over at 80-90 depending in inroom response, and somewhere in the 600-700Hz range.
It's a calculated move indeed, also because I needed to sell my previous speakers to be able to afford the new custom build. That gave me more than enough time to draw the midbass horns and get assistance to simulate a range of 12" woofers in the horn geometry. The PD's came out on top with the most linear response and bottom end. Allthough I had not seen these particular woofers myself, PD drivers seem to be of very high quality. I also wanted to try something with a neo magnet system.
Hello.
Been following this thread for a while. I'm well behind you in my learning curve and now working on my midrange horn. As of now, the midbass will be handled by twin 10" woofers in sealed boxes...but your experience with midbass horns is tempting to follow...
Would you mind posting your simulations with the PDs and the chosen geometry? I already have the midbass drivers but want to simulate how they would look on Hornresp.
BTW, what has been your experience regarding lobbing, considering the size of your midrange horn and the center-to-center distance to the tweeter? I'm leaning towards a rectangular midrange horn.
Fantastic build, BTW!!
I do not have the simulations on my own computer, but I will try to get a hold of them. Simulated response is 80-850Hz with the two stacked horns per side.
I have experimented with a sealed enclosure with 2pcs of the GPA(Altec) 414Alnico in each box, compared to my previous midbass horn. The horn is so much better, in my opinion, that it's not even funny.
I have had no real, audible problems with lobing, but the new system I am designing is based on trying to minimize the spacing between drivers even more. That being said I am now using a slightly smaller midrange horns over the midbass, but still with the JMLC geometry. I do not really like the rectangular horns, even though I have no real experience with them in my own room.
Yes, I noticed it and in fact the similarities to the system I was envisioning hooked me onto the thread. Later, your statements about the midbass improvements with the horn...set the hook even deeper 🙂
Could you describe the midbass horn so I can simulate it in Hornresp? I know what driver you use and that there are two of them. Do you remember your throat surface (S1), mouth surface, and horn profile you are using?
BTW, why two 12" in a horn? Isn't one driver enough?
Throat = 240cm2
Mouth = 2498cm2
Conical vertically
Horisontally a smooth radi from throat to mouth.
Two horns stacked together gives a very nice effect of going even lower and having a smoother response.
You can never get "enough" 😉
Mouth = 2498cm2
Conical vertically
Horisontally a smooth radi from throat to mouth.
Two horns stacked together gives a very nice effect of going even lower and having a smoother response.
You can never get "enough" 😉
Not sure what a smooth horizontal radi means. I took a shot at modelling it on Hornresp as a conical horn. Is it representative of your horn?
Attachments
Fortunately!! What I posted didn't look good at all.
When/if you get your hands on the specs of the horn and the simulations and could post them, I would be bery thankful. I'm definitely intrigued, but not sure if the drivers I have are suitable. Starting with a horn that works for you and trying to simulate my drivers there could be a good start.
Cheers!
Indeed. I have no experience with hornresp in detail, so I can't really help you with that. Sorry. What drivers will you be using?
How do you model your horns?
How long is your mid bass horn?
I have Beyma 10G40, that I purchased with the idea of using two per side in sealed enclosures.
How long is your mid bass horn?
I have Beyma 10G40, that I purchased with the idea of using two per side in sealed enclosures.
I model them using SolidWorks 3D-cad, see attachments.
The horn itself is approx 550mm deep.
For midbass horns you are typically looking for Low Xmax, Qts and Le.
I'm not sure if your woofers are very good for this use, but they should be based on a specifically designed horn. I not believe downscaling my horns would be a great idea.
The horn itself is approx 550mm deep.
For midbass horns you are typically looking for Low Xmax, Qts and Le.
I'm not sure if your woofers are very good for this use, but they should be based on a specifically designed horn. I not believe downscaling my horns would be a great idea.
Attachments
I meant what you use to simulate the behavior of the drivers in the horn. What did you use to get the graph you posted on #153?
Downscaling your horns is not really what I'm after. I am more interested in understanding their key parameters. If you were using Hornresp, for example, an image of the input section would suffice.
I've taken a second shot at simulating on Hornresp (only 1 driver). It's closer to #153, but fc is 147Hz. You mentioned you intended to use the horns from 80Hz. What's the fc you are working with?
Downscaling your horns is not really what I'm after. I am more interested in understanding their key parameters. If you were using Hornresp, for example, an image of the input section would suffice.
I've taken a second shot at simulating on Hornresp (only 1 driver). It's closer to #153, but fc is 147Hz. You mentioned you intended to use the horns from 80Hz. What's the fc you are working with?
Attachments
I thought he used Hornresp, but now I'm not really sure looking at the graph.
However, I do not have these simulations.
The simulated acoustic response is down to 80hz. Inroom response might be a bit different both ways, so we will see. Luckily I have a bass solution that is quite adaptive in that regard, and I can experience with what XO gives the most natural and snappy midbass respons from my listening position via the DSP. Happy days ahead!
However, I do not have these simulations.
The simulated acoustic response is down to 80hz. Inroom response might be a bit different both ways, so we will see. Luckily I have a bass solution that is quite adaptive in that regard, and I can experience with what XO gives the most natural and snappy midbass respons from my listening position via the DSP. Happy days ahead!
Hi guys.
Just recently built a multichannel amp for a guy that bought my previous horn system. Here are some pics:
Not the smoothest cabling or layout in the world, but with a design criteria revolving around separating 230VAC, signal in and out as much as possible this is the result. And successful, no audible noise from the horns even with the volume control totaly open.
The two smaller modules are Anaview AMS0100 and the big one is AMS1000.
Just recently built a multichannel amp for a guy that bought my previous horn system. Here are some pics:
Not the smoothest cabling or layout in the world, but with a design criteria revolving around separating 230VAC, signal in and out as much as possible this is the result. And successful, no audible noise from the horns even with the volume control totaly open.
The two smaller modules are Anaview AMS0100 and the big one is AMS1000.
- Status
- Not open for further replies.