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First build 15 inch sub

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Category: General
Forum Name: General Forum
Forum Description: Open Discussion / Questions
URL: https://forum.speakerplans.com/forum_posts.asp?TID=98485
Printed Date: 28 March 2024 at 11:34pm
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Topic: First build 15 inch sub
Posted By: JonB67
Subject: First build 15 inch sub
Date Posted: 10 May 2017 at 10:11pm
So here goes.

Never built anything like this before and the learning curve has been steep at times. Thanks a million to bee and diyxover without whose early responses I'd have probably given up. Instead I kept going and came up with my own design.

Thanks to my friend mark for use of his garage and assistance. I promise to stop boring him with stuff I've found out as soon as we have tops built and are running dsp.

First panels cut


Then I finalised internal bracing design and made that


Dry clamped the box with driver in and rolled over a bar to get centre of gravity to position handles (did this before the bracing actually)


Messed up the baffles so made a second set


Baffles done, rebates cut and ports in! Felt like I was getting somewhere!



Replies:
Posted By: mini-mad
Date Posted: 10 May 2017 at 10:19pm
Looking good so far!! 15" drivers?



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If it sounds like a gorilla is trying to escape, turn it down.


Posted By: JonB67
Date Posted: 10 May 2017 at 10:21pm
Btw this is for a bms 15n630 in a 90 litre box.

Port detail. Cut the rear baffle so the pipes are a really snug fit, then routed the front with a trim bit then a roundover.


Probably the best shot of the detail of the design, for better or worse.


Box assembled.


Needs handles cutting in and a rebate for the speakon plate and then it's ready to test... and I need to glue the other one up. This one's coming to a gig on Saturday just for a test though!


Posted By: cravings
Date Posted: 10 May 2017 at 10:22pm
good work!


Posted By: Shortrope
Date Posted: 10 May 2017 at 10:29pm
Tidy!

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My Tinnitus is coming along nicely!!


Posted By: imageoven
Date Posted: 10 May 2017 at 10:29pm
You've made a nice job of that. Ports look really nicely done.

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Keep pushing on, things are gonna get better.


Posted By: Speaker Sol
Date Posted: 10 May 2017 at 10:33pm
Very nice.




Posted By: Keen
Date Posted: 11 May 2017 at 3:59am
Lovely work!


Posted By: rish
Date Posted: 11 May 2017 at 9:00am
Very nice. Well done. What driver are you using?

Rish


Posted By: doller
Date Posted: 11 May 2017 at 9:03am
liking those ports and braces.


Posted By: JonB67
Date Posted: 11 May 2017 at 9:09am
It's a bms 15n630 rish. It's built to the bms recommended spec of 90 litres and 43hz.

Figuring the best way to maximise bracing for minimum weight was what took me the longest. Lots of cups of tea and sketching on graph paper.

I was a little concerned it might be too close to the vent in the magnet but as no one's said it'll be a huge problem I'm guessing it's fine!


Posted By: rish
Date Posted: 11 May 2017 at 11:08am
Lovely driver and build. Tony Wilkes would have been proud.

Rish


Posted By: Darkstar
Date Posted: 11 May 2017 at 12:31pm
Originally posted by JonB67 JonB67 wrote:

I was a little concerned it might be too close to the vent in the magnet but as no one's said it'll be a huge problem I'm guessing it's fine!

That's actually a rightful concern, it'd be far more worse if it was a whole panel though, as long as it can "breathe" through the sides it's ok.
The problem with having the port so close to a wooden object is that it can absorb a lot of heat which is going directly back to the voicecoil. However it should be no real issue unless you overpower the thing, which you're not supposed to anyway.

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Bass =/= Enough


Posted By: cravings
Date Posted: 11 May 2017 at 1:57pm
i asked before how close to the vent could i go, and i'm sure i was told that once there was the same distance as the diameter of the vent, it'd be fine.

you've loads of room there.


Posted By: Dub Specialist Sound
Date Posted: 11 May 2017 at 8:43pm
Nice works bro tbh

keep it up Thumbs Up


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Musical Roots Reggae Vibration is Life! for music is sound...sound is vibration...vibration is energy... and energy begets life. Therein lies my passion!...MUSIC IS LIFE...


Posted By: bass*en*mass
Date Posted: 11 May 2017 at 9:40pm
lovely build so far.. wouldnt worry the slightest re bracing/distance, seems fine to me..



Posted By: JonB67
Date Posted: 11 May 2017 at 10:45pm
Thanks for all the positive comments.

Can't wait to get them running. If they dont sound better than my peaveys I'm going to be upset!


Posted By: jammin75
Date Posted: 11 May 2017 at 11:31pm
Thumbs Up

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feel the vibes !!!   "Who Feels it Knows it"            Strong like Lion              


Posted By: JonB67
Date Posted: 14 May 2017 at 2:58am
Well it's up and running at an event. Tighter, cleaner more punchy And goes lower than the peavey it's replacing.

What difference does a brand new driver make? How do they change as they bed in?


Posted By: bob4
Date Posted: 14 May 2017 at 7:50am
I guess the general consensus is that fs shifts a little bit down as the suspension gets worked out and slightly less stiff?


Posted By: triumphant
Date Posted: 14 May 2017 at 10:09pm
Originally posted by JonB67 JonB67 wrote:

Thanks for all the positive comments.

Can't wait to get them running. If they dont sound better than my peaveys I'm going to be upset!


Would you say that you'd be a little peaved?


Posted By: JonB67
Date Posted: 14 May 2017 at 10:16pm
Ha Ha!

Yeah I would have been!

As it was they sounded better from the start and six hours later at the end if the night they were wiping the floor with them. Noticeable difference after that time.    The comparison made the peavey sound like it was playing through wet carpet.

I now need to tune the boxes proper so got to read up on rew and impedance measurements.

I'll update as I go!


Posted By: bitSmasher
Date Posted: 15 May 2017 at 12:16am
Such a nice build. As much as I want to call out the bracing as superfluous woodwork, we're all guilty of it in one way or another...

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https://www.instagram.com/batteryacidsoundsystem/


Posted By: JonB67
Date Posted: 15 May 2017 at 7:32pm
The bracing was inspired somewhat by csg's thread on here. I tried to maximise what the bracing could do for minimising any vibration of the box without adding too much weight.

I've got lateral *and* cross bracing in one arrangement and the boxes are an easy lift. In use I put my hand on them and the vibration is minimal in all areas as they are clearly very stiffened by the bracing structure.

Superfluous maybe but it's certainly achieving what I wanted!


Posted By: triumphant
Date Posted: 15 May 2017 at 7:37pm
It also looks sexy should you remove the speaker. A very professional build of which I'd like to see finished and painted etc.


Posted By: mstep77
Date Posted: 16 May 2017 at 8:13am
Looking great!


Posted By: kevinmcdonough
Date Posted: 16 May 2017 at 12:10pm
very nice work

Very similar to a 15" reflex I also designed recently, that I'll build when I have some time in the next month or two. 



K



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