2 24" T48 build (my first build)

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jswingchun
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Joined: Fri Dec 01, 2006 9:43 am
Location: Cedar Rapids, Iowa
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Re: 2 24" T48 build (my first build)

#31 Post by jswingchun »

djtrumptight wrote:Back to the topic,dude,if i was you,i would go back and add PL to all those braces,all around the driver spacer ring,everywhere where u have joined 2 pieces of wood because from what i see you are gonna get some rattling.
I'm not sure what you are seeing, but it looks like there is plenty of PL squeeze out to me????
Omni 10
Omni 10.5
OmniTop 12 x 4
Wedgehorn 8 x 3
XF212
T39 @ 18" x 2
T39 @ 20" x 2
T39 @ 28" x 2
Jack 110 x 5
Jack Lite 12
XF210
XF210 (Slant only, no crossfire)

djtrumptight
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Joined: Tue Dec 15, 2009 6:08 pm
Location: Detroit,Michigan

Re: 2 24" T48 build (my first build)

#32 Post by djtrumptight »

im talking about the spots i pointed out where the PL appears to be thin as well as on that brace where the PL doesnt go all the way to the end,they could cause a rattle:
possible air leaks.jpg
Also on my T48's,i put PL all around the outside and inside edge of the baffle spacer ring and look at that brace thats right in front of the driver baffle,thats a major rattle.I had to remove my driver after assembly to add more PL to those braces because my T48 was sounding nasty,instead of boom boom boom it was twang twang twang:
air leaks 2.jpg
Its best to glue the cab up in a manner that leaves you confident that its air tight as opposed to having to run all around the cab trying to locate an air leak.I just took my own advise with my 2nd autotuba,finished it,no air leaks,makes the building process much more fun.
Attachments
air leaks 2.jpg
possible air leaks.jpg
Built:
2 Autotuba's MCM 55 2421
8 T48's 24"wide 3015 LF
2 DR 250's melded Deltalite II 2510
2 DR 250's flat Deltalite II 2510
2 SLA HT systems
1 Table Tuba Dayton DCS 255-4
2 T 39's 20" wide 3012 LF
1 T-18 13" wide MCM 55 2421
2 SLA Pro's

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jswingchun
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Location: Cedar Rapids, Iowa
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Re: 2 24" T48 build (my first build)

#33 Post by jswingchun »

I can't see well enough in those pictures to be able to tell how much squeeze out there is. You must have better eyes than I do. :wink:
Omni 10
Omni 10.5
OmniTop 12 x 4
Wedgehorn 8 x 3
XF212
T39 @ 18" x 2
T39 @ 20" x 2
T39 @ 28" x 2
Jack 110 x 5
Jack Lite 12
XF210
XF210 (Slant only, no crossfire)

djeccentric
Posts: 34
Joined: Tue Jul 13, 2010 10:09 pm

Re: 2 24" T48 build (my first build)

#34 Post by djeccentric »

thanks for the advice on adding more pl i see the point better safe than sorry. i am going to have a hard time getting to the lower braces, maybe i will enlist my buddy with little arms for that. good thing you guys caught it now my next step is run the power wires and then it is seal up time. i am very anxious to see how this thing sounds. in my little ass garage it should be crazy loud with just one. once they are both painted up i am going to clean out the garage and have a party in there. will be a super late b-day/the-subs-are-done celebration. definitely going to invite the guy who runs the local venue too "grin face"

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Tom Smit
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Location: Sarnia, Ont. Canada

Re: 2 24" T48 build (my first build)

#35 Post by Tom Smit »

djeccentric wrote: in my little ass garage it should be crazy loud with just one. once they are both painted up i am going to clean out the garage and have a party in there. will be a super late b-day/the-subs-are-done celebration. definitely going to invite the guy who runs the local venue too "grin face"
You might not have the experience that you're hoping for! However, if you put them outside, then..... 8)
TomS

djeccentric
Posts: 34
Joined: Tue Jul 13, 2010 10:09 pm

Re: 2 24" T48 build (my first build)

#36 Post by djeccentric »

Tom Smit wrote:
djeccentric wrote: in my little ass garage it should be crazy loud with just one. once they are both painted up i am going to clean out the garage and have a party in there. will be a super late b-day/the-subs-are-done celebration. definitely going to invite the guy who runs the local venue too "grin face"
You might not have the experience that you're hoping for! However, if you put them outside, then..... 8)
what do you mean?

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Harley
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Joined: Mon May 08, 2006 2:45 pm
Location: Christchurch, New Zealand - Authorised BFM Cab Builder

Re: 2 24" T48 build (my first build)

#37 Post by Harley »

djeccentric wrote:
Tom Smit wrote:
djeccentric wrote: in my little ass garage it should be crazy loud with just one. once they are both painted up i am going to clean out the garage and have a party in there. will be a super late b-day/the-subs-are-done celebration. definitely going to invite the guy who runs the local venue too "grin face"
You might not have the experience that you're hoping for! However, if you put them outside, then..... 8)
what do you mean?
Room cancellation probably
ImageSemi-retired: Former Australia and New Zealand Authorised BFM cab builder.

djeccentric
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Joined: Tue Jul 13, 2010 10:09 pm

Re: 2 24" T48 build (my first build)

#38 Post by djeccentric »

good point, the concrete walls are not the best for acoustics. but the ceiling has exposed insulation so that should help. i guess i will just have to find out.

djeccentric
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Joined: Tue Jul 13, 2010 10:09 pm

Re: 2 24" T48 build (my first build)

#39 Post by djeccentric »

so today i finally got around to installing panel 11 and i noticed that the plans say early on to cut it a certain dimension for ruff cut and later when it is time to install the piece the plans say to cut it a half inch larger than the ruff cut dimension earlier. either i am seriously misreading the plans or this is a error. the larger dimension seems to be right based on the layout diagram so i will go with that but i still have to cut another piece. ugh!

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Bill Fitzmaurice
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Re: 2 24" T48 build (my first build)

#40 Post by Bill Fitzmaurice »

djeccentric wrote:so today i finally got around to installing panel 11 and i noticed that the plans say early on to cut it a certain dimension for ruff cut and later when it is time to install the piece the plans say to cut it a half inch larger than the ruff cut dimension earlier. either i am seriously misreading the plans or this is a error. the larger dimension seems to be right based on the layout diagram so i will go with that but i still have to cut another piece. ugh!
That's a plan glitch from an earlier version. That panel size is not critical.

djeccentric
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Re: 2 24" T48 build (my first build)

#41 Post by djeccentric »

i have some more updated photos for you all

Image
Image
Image
Image
Image
Image

all i have to do is round over the corners add the front bracing which i will do after i paint the horn mouth paint the cab and add the corners and it is done. i plan to do the painting when i am finished with the other so i can clean up the shop and have a good environment for painting.

i did start the 2nd cab i am as far as having panel 2 glued in and panel 3 and 4 cut and ready to glue in.

djeccentric
Posts: 34
Joined: Tue Jul 13, 2010 10:09 pm

Re: 2 24" T48 build (my first build)

#42 Post by djeccentric »

i took the sub out for a gig as it was in the last picture. it was a small gig but the bass player didn't think to bring his amp good thing i brought it. i just hooked him into a di and through the board. i just placed the sub up facing the back wall and it sounded really good. i barely had the amp turned up just enough to hear it nicely.

the gig went south when my amp for the sub started to smoke (a lot) so i just ran the rest of the night through my tops. i didn't think to just use my one amp for tops and the sub oh well.

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Tom Smit
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Re: 2 24" T48 build (my first build)

#43 Post by Tom Smit »

Good to hear on the sub being barely turned up!
Is there a short somewhere for the sub?
TomS

djeccentric
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Re: 2 24" T48 build (my first build)

#44 Post by djeccentric »

i checked out the sub and there was no problem there. it was just a defective amp and they have sense then sent me a replacement. a few weeks ago i did a high school reunion and was able to really open them up. lets just say the subs were dancing as much as the next guy. i had to keep pushing them back near the wall.

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DJPhatman
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Re: 2 24" T48 build (my first build)

#45 Post by DJPhatman »

djeccentric wrote:i checked out the sub and there was no problem there. it was just a defective amp and they have sense then sent me a replacement. a few weeks ago i did a high school reunion and was able to really open them up. lets just say the subs were dancing as much as the next guy. i had to keep pushing them back near the wall.
This is caused by lack of proper bracing. Install the mouth braces per the plans, and check to make sure no other braces came loose. Also, check for any minute air leaks. Even the tiniest leak will rob SPL.
I know money often seals the deal, but seriously, quality is an investment, not an expense... Grant Bunter
Accept the fact that airtight and well-braced are more important than pretty on the inside. Bill Fitzmaurice

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