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Alternative driver for P Audio DIY/115s plans

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DMorison View Drop Down
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    Posted: 20 March 2021 at 1:32pm
Hey, you're welcome.
Looks like good work finishing up the boxes, I'm glad they sound good to you so far.
Obviously, when you do get to push them harder will be the real test, but they should at least get you by for a bit with that driver.
Assuming you do grow out of them at some point, the large port is ready to take considerably more output from a beefier driver, so you don't have to replace the whole box.
Cheers,
David.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sarsen1 Quote  Post ReplyReply Direct Link To This Post Posted: 19 March 2021 at 2:37pm
Finally got round to finishing these (need some more screws in the grills), very pleased with how they ended up and glad I have completed my first speaker build. Only tested in my little studio but pleasantly surprised with the £60 300w p-audio. Interested to see how they would sound with better drivers for stand alone use in a PA style.

Thanks DMorison for sharing your knowledge, spending the time doing dims and putting the plan together!





Edited by sarsen1 - 19 March 2021 at 2:37pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DMorison Quote  Post ReplyReply Direct Link To This Post Posted: 05 February 2021 at 1:24pm
Looking good so far! Thumbs Up
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sarsen1 Quote  Post ReplyReply Direct Link To This Post Posted: 05 February 2021 at 10:05am
Going okay so far, balanced the panels together and it looks like a speaker!



Edited by sarsen1 - 05 February 2021 at 10:11am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DMorison Quote  Post ReplyReply Direct Link To This Post Posted: 28 January 2021 at 3:29pm
Proper Birch if you think you're at all likely to stick in a serious driver at any point in the future, IMO.

If you imagine you'll be happy with lower output long term, then maybe cheaper wood, though if that were the case you could have saved on including quite such a huge vent.

FWIW,
David.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sarsen1 Quote  Post ReplyReply Direct Link To This Post Posted: 27 January 2021 at 3:15pm
Brilliant, thanks again!

Drivers and hardware ordered, waiting on a quote for wood. Prices will determine whether I go MDF, cheaper ply or BB grade birch. This will only be my second build so don't want to splash too much for birch just yet...


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Post Options Post Options   Thanks (0) Thanks(0)   Quote DMorison Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2021 at 8:49pm
You're welcome!
It's not that I don't geek out about designs like this half the time anyway, and with lockdown etc, time is one thing I absolutely have plenty of, soo  Wink

BTW, Just updated the plan with a bit extra info re driver mounting - in case it wasn't clear, with the vent that big, there wouldn't be room for the driver bolt holes & T-Nuts if you tried to position them at 12 & 6 o'clock etc, so you'll need to rotate the driver 1/16th of a turn to get enough clearance.

Cheers,
D.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sarsen1 Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2021 at 5:50pm
You are a hero David thank you! Looks Awesome.

Going to get the driver ordered and wood cut this week hopefully so can get a prototype knocked up asap, will keep you posted...

Thanks so much for taking the time to do this, I really appreciate the help. Not everyone would take the time to help a stranger like this Clap






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Post Options Post Options   Thanks (0) Thanks(0)   Quote DMorison Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2021 at 4:59pm
Alrighty then, this should have everything on it, shout if you think anything's not clear or just straight up missing (click image for link to fullsize if it doesn't render properly in the forum).

I've sized the ports to give decent airspeed even with top end drivers like Beyma 15LEX1600Nd with 14.5mm Xmax, that does mean the airspeed with an entry level driver like E15-300S is hilariously low.
The box is a few cm taller then the P.Audio original to accommodate that big a port without too much penalty in lost volume. Tuning should come out at 45Hz, higher would be marginally better for the E15-300S but would be worse for drivers like the Beyma, so it's a bit of a compromise. 

The graphs below show the 15LEX1600Nd vs the E15-300S, as you can see the Beyma can do 9dB more at 50Hz, that's about the equivalent of three of the P.Audios, FWIW. Above 70Hz, it only takes 2 P.Audios to keep up with the Beyma. These graphs have HPF's in place for excursion control below tuning, 38Hz Butt24 for the Beyma and 36Hz Butt24 for the E15-300S.

Allowing for drivers like the Beyma is why I've also beefed up the bracing just a little bit.

I haven't specified the exact location for the handles, just shown an example of a typical bar handle. Ideally you'd build the box, load the driver then check exactly where the centre of gravity comes out and mount the handle there - this in turn means the exact height of the horizontal braces is also not set in stone yet.

Cheers,
David.




Edited by DMorison - 26 January 2021 at 8:44pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sarsen1 Quote  Post ReplyReply Direct Link To This Post Posted: 25 January 2021 at 4:02pm
Amazing! Thank you again for your help...

I think going for the cheap E15-300s at the moment looks like a great option if the performance is acceptable and the costs are low! But would certainly like to have the option to upgrade to more powerful driver in the future if I went with a 300w driver right now. So if did you had the time to knock up a rough sketch of the plan with slot ports that would be a huge help and greatly appreciated!

I suppose the only size factors that would matter for me would be 600mm wide to match the scoops, deep enough to be stable when pole mounting the tops when used in a PA style and also keeping enough height to keep the tops above heads when on top of the 900mm high minis would be beneficial. But I think the dimensions of the plan as is are pretty close to what I would need.

Thanks!




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Post Options Post Options   Thanks (0) Thanks(0)   Quote DMorison Quote  Post ReplyReply Direct Link To This Post Posted: 25 January 2021 at 1:40pm
Yeah, that E15-LF isn't ideal if you want to get on with the project quickly.
If the slightly lower output of the Fane isn't a deal breaker there are a couple of other options to consider.
The Kappa 15LF does get slightly deeper than the Fane in this box, and the difference in SPL above 60-odd Hz is small enough to ignore IMO.
Slightly left-field is a cheaper P.Audio - the E15-300S. It's meant more as a general purpose bass-mid unit, but if the same Xmax definition is used that I mentioned before it can actually do a little better then either the Fane or the Kappa in this box, and is cheaper & lighter than either to boot.

By the way, do you have any other requirements/preferences for box dimensions? I know you mentioned the width matching your mini-scoops, do you want depth to match too for example?
I can do a provisional plan with slot ports if you want, but knowing any other size factors like that would help.
Also, if you were to start with something cheap like the E15-300S now, would you want to consider upgrading to a more potent driver in the future? If so, sizing the ports to handle that now would be a lot less work than modding an already-built box later ;-)

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Post Options Post Options   Thanks (0) Thanks(0)   Quote sarsen1 Quote  Post ReplyReply Direct Link To This Post Posted: 24 January 2021 at 5:00pm
Thanks so much for taking the time to do the comparison David, much appreciated!

Thought it was too good to be true with Thomann prices... 

So I could either crack on with the Fane (or perhaps Emmy kappa LF as that looks like it might be suited to a larger box) and the plan as is and get okay results, or wait until April when the P Audio is expected back in stock to work out the shelf vent modifications in the meantime and get better results... looks like the homework continues.









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