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New 3-way mid-top |
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Andylaser 
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Joined: 16 April 2010 Location: Southampton Status: Offline Points: 392 |
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 Posted: 11 March 2022 at 7:46pm |
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That look excellent. Nice work.
 Edited by Andylaser - 11 March 2022 at 7:47pm |
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"music so loud, that if we move in next door to you; your lawn will die" - Lemmy
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UncleRay
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Joined: 25 October 2024 Status: Offline Points: 21 |
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Posted: 25 October 2024 at 12:35pm |
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Hi there, I have been planning to build a 12” 8” 1” speaker for use in my ‘sound room’ and have stumbled upon your build. I have joined the forum specifically to ask about your design. It looks excellent, may I ask if you would have done anything differently if you had the project to do over again?
Did you ever get the chance to do measurements of the speakers? And what is the lower bass response like? I would be planning to cross over around 120hz but do you think I could achieve 100hz or even 90hz with a similar design (12, 8, 1”) ? It will be my first attempt at building a speaker and I am just trying to learn the basics at the moment. I am finding the research fascinating and appreciate I have much to learn! Thanks |
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ceharden
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Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11851 |
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Posted: 25 October 2024 at 7:41pm |
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Hi, I did do some measurements in order to do the crossover design but I don't think I saved them anywhere I could find them quickly sorry!
The bass response is obviously determined by the choice of 12" driver and the cabinet. It has a fairly gentle roll off from probably a bit above 100Hz and I think the tuning is around 60Hz. I normally run them with a crossover around 120Hz depending on what I'm using for the bass. The 12" driver I used has plenty of excursion available so there is some scope to apply some EQ to flatten out the low frequency response and you could cross over lower, especially running at lower volume levels. I'm very happy with the design, it sounds really good, there's nothing that I can immediately think of that needs changing. |
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UncleRay
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Joined: 25 October 2024 Status: Offline Points: 21 |
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Posted: 25 October 2024 at 9:19pm |
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Thank you for the reply, good to know. I can imagine it sounds very nice indeed. I was initially going down the horn route but decided it less than ideal for a smallish space. Do you happen to have any plans or the CAD that you would be happy to share?
It definitely ticks all the boxes I am looking for. |
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ceharden
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Posted: 26 October 2024 at 12:12am |
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I can give you as many pointers as I can to help you design something similar but I don't really have any plans I can share sorry.
Have you looked at which drivers you want to use yet? I happened to have some 18Sound drivers I'd bought years previously but there are e.g. B&C alternatives that would work as well. Where are you located? |
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UncleRay
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Posted: 26 October 2024 at 10:14am |
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Ah no problem, thanks anyway. I’m trying to get my head around an app called speaker box lite in order to figure out the ideal box volume and port details. Do you know what your box volume was? I’m finding it tricky to work out with horn and mid fitted.
Would you mind sharing the box dimensions? Also did you put the 8” driver in a sealed chamber? I thought it would be nice to cross the 8” mid into the compression driver as high as possible (maybe 4K?), are there any drivers you know of that could do this while still maintaining 90 degree dispersion to match the horn? I was only thinking this after hearing Tony Andrew’s speak of his dislike for comps in the midrange. Don’t know if this is possible with an 8” though and I may be just being suckered in by his biased opinion!? Really appreciate your replies, thanks |
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FOO
Young Croc 
Joined: 23 December 2018 Location: Denmark Status: Online Points: 949 |
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Posted: 26 October 2024 at 11:03am |
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You have to take whatever Andrews say with a pinch of salt. He is very skilled, no doubt about it. But plenty of very high end manufactures don't agree with it. It all comes down to the ears that are listening.
I don't like the sound of Yamaha speakers. But I like RCF. Others will strongly disagree. It's all about taste  |
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ceharden
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Posted: 26 October 2024 at 12:51pm |
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The 8" definitely needs it's own sealed enclosure, unless you pick one of the very fancy, very expensive ones that have their own sealed back e.g. https://www.lean-business.co.uk/eshop/18-sound-8nm610-8ohm-400watt-very-high-output-neodymium-mf-p-1559.html
I cross over just over 3kHz from memory, in my opinion that's still high enough to get it out of the critical range. I'm using a 60deg wide horn so trying to match the dispersion of the 8" is less of an issue. The overall dimension of the box is 800mm tall, baffle is 320mm wide and 355mm deep, including the curve on the front. It's a 15deg trap angle. I think the total volume available to the 12" once you take out the chamber for the 8" and the ports either side is probably around 45litres. |
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UncleRay
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Posted: 27 October 2024 at 8:06am |
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Thanks for that info, yes 3kHz sound like a good place to cross over. I often see compression drivers running down to 1kHz or below which seems like a lot of range for them to cover.
What mm ply did you build from? I was thinking of maybe modifying the port to run horizontal below the 12” driver - purely for aesthetic reasons, but might add too much unnecessary height! |
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snowflake
Old Croc 
Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3443 |
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Posted: 27 October 2024 at 1:21pm |
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using the back chamber of the mid to make the reflex ports is one of the clever things about this design. Not even sure why you think it would look aesthetically better moving the ports to the bottom.
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UncleRay
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Posted: 27 October 2024 at 1:29pm |
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It would just fit my system a little better as the rest of my cabs have single horizontal slot ports, that’s all. You’re right that they are a great part of the design though.
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ceharden
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Posted: 27 October 2024 at 7:32pm |
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They're made from 15mm ply.
The top and bottom of the ports, which also form two sides of the rear chamber, are also rebated into the side panels and provide significant bracing to the cab without needing any extra parts.
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