Subwoofer build thread: the "RJB 12"

[lunchmoney]

It's named the "RJB12" as thanks to Roman Bednarek for helping calculate the correct volume for me.

Dayton RSS315HF-4 with Dayton SA240B plate amp... 1.8 liters sealed... this is the net volume, taking into account the volume of the driver, amp, and braces,

[bd1000]

looks good!

[JonMarsh]

Nice job with the bracing and clamps!

[lunchmoney]

Thanks guys



1/2" PE spikes installed... I love these things... rock solid, simple to install, dirt cheap...



Sanded down the seams with a palm sander and 60 grit...



3/4" roundover on the vertical edges

[lunchmoney]

PE Black Ash vinyl laminate





Done...



VERY pleased with it so far... I'm using it with my music system... with my SR71's, low passed/high passed at about 80 hz... I'd describe the sound as clean, effortless, and musical... great sub.

[evilskillit]

Looks sharp man. I love it.

Awesome, can I get some feedback on how it handles the lowest music octaves, 20-35hz roughly? Maybe some measurements if you've got em? I have a friend who wants a sub for music only and he's leaning towards a ported reference 12. I'm kind of leaning him towards a sealed 12 or 15 since all he cares about is music, but I'm not sure really, ported isn't bad after all, especially if done right, and I've made a few of em.

Also did you notice any improvement in the sound of your SR-71 when you high passed em at 80. I know the ER18RNX is a very capable woofer so maybe it's not as noticeable but when I highpassed my little microbes at 77hz it really cleared up the midrange at moderate and high volumes, so much smoother and sweeter. I never knew what I was missing out on till I did that.

[lunchmoney]

Looks sharp man. I love it.

Awesome, can I get some feedback on how it handles the lowest music octaves, 20-35hz roughly? Maybe some measurements if you've got em? I have a friend who wants a sub for music only and he's leaning towards a ported reference 12. I'm kind of leaning him towards a sealed 12 or 15 since all he cares about is music, but I'm not sure really, ported isn't bad after all, especially if done right, and I've made a few of em.

Also did you notice any improvement in the sound of your SR-71 when you high passed em at 80. I know the ER18RNX is a very capable woofer so maybe it's not as noticeable but when I highpassed my little microbes at 77hz it really cleared up the midrange at moderate and high volumes, so much smoother and sweeter. I never knew what I was missing out on till I did that.

Thanks!

I can't say that I'm noticing an improvement in SQ out of the ER18's by high-passing them... however, I do like how it sounds with only the sub handling bass duty... the bass sounds cleaner and more defined to me to not have the ER18's reinforcing what the sub can so easily handle on its own... so yes, I am preferring how the system sounds with the mains high passed.

[Art Vandelay]

Very nice. I'm thinking of building a sub with that same driver and amp (just finishing up my first speaker build, a pair of Tritrix TLs). What were the overall dimensions of your enclosure? I assume you got the 1.8L volume off of CAD drawings, since you're taking the curved baffles into account?

[bd1000]

I like that laminate, nice!