8" vs 10" truck Tuba

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centner
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Joined: Thu Nov 07, 2019 12:21 am

8" vs 10" truck Tuba

#1 Post by centner » Fri Nov 08, 2019 8:52 pm

Long time Lurker have built 4 24" wide Tuba 24's and now 1 truck Tuba for my nephew. After having it installed we couldn't leave the install store for 2 hours as they had all their techs come through and listen to the vehicle. They couldn't believe what they were hearing out of a 8" box with only 300 watts. As kids are kids and deeper and louder is always better I was wondering how much more output you would get from a 10" box. I built the 8" box 8" deep with theTang Band W8-740P driver. I would go the full 10" with the next build any recommendations on the two drivers listed in the plans (Dayton DCS 255-4 and LS10-44) both are cheaper than the Tang Band I used last time? or another driver that is better than those

Thanks

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Bill Fitzmaurice
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Re: 8" vs 10" truck Tuba

#2 Post by Bill Fitzmaurice » Fri Nov 08, 2019 10:30 pm

A ten might go louder than an eight if it has greater Vd (xmax times Sd). With all else being equal, and assuming you don't exceed the thermal rating, doubling Vd will give 6dB more maximum SPL. The W8-740 Vd is 260cc, DCS255 280cc, LS10 360cc.

himhimself
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Re: 8" vs 10" truck Tuba

#3 Post by himhimself » Sat Nov 09, 2019 1:56 pm

Follow on question, as I've been thinking about building a trucktuba. My plans don't list the dayton LS10-44, but I just looked it up and it's specs fall nicely in the middle of the recommended ranges. Plans say with a 10" driver, minimum cabinet width should be 7" (6" internal panel width). Is that just to accommodate the driver depth? With the shallow LS10-44 (only 3.4"), could the cabinet be made narrower like the 8" driver version? Would the benefits of the 10" driver still be realized, with say a 5" deep box? The LS10-44 is about twice the cost of the MCM55-2421, and would take a two channel amp to drive since it's DVC. Wanting to do this on the cheap if possible, so any advice on whether I should consider this option. Thanks!!
2xT30 (20", 3012lf)
4xOtop Jarray

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Bill Fitzmaurice
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Re: 8" vs 10" truck Tuba

#4 Post by Bill Fitzmaurice » Sat Nov 09, 2019 4:05 pm

With the larger cone area of a ten the horn throat needs to be wider, which is accomplished by making the cabinet deeper.

himhimself
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Location: Bloomington IN

Re: 8" vs 10" truck Tuba

#5 Post by himhimself » Sat Nov 09, 2019 10:00 pm

Aha, thanks Bill. I think I'll probably stick with the 8" MCM then.
2xT30 (20", 3012lf)
4xOtop Jarray

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