Vintage OmniTop 12

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Marko Ursin · #1 Post by **Marko Ursin** » Thu Jun 14, 2007 12:59 pm

Here's few pics of my OmniTop12. It will be used as bass cabinet. Two Beta12's inside. So far I haven't tested it as I don't have bass amp right now. A tube amp with Alembic pre and Marshall JCM power section is under construction at the moment.

Marko

Marko Ursin · #2 Post by **Marko Ursin** » Mon Jul 09, 2007 12:06 pm

Some testing done. Sounds great! OTop12 is really efficient. 50W tube amp will be more than enough on the volumes I need. This cab really has vintage sound, only louder than those old cabinets.

Marko

Marko Ursin · #3 Post by **Marko Ursin** » Tue Jul 10, 2007 12:15 am

bgavin wrote:When you say vintage, do you mean thin in the bottom?

There's nothing thin in the bottom with this setup. More likely the top end is a bit limited. But that's the way I wanted it, no fret noise or any other hissing and clanking. Sounds just like a BASS.
Marko

Jujuman · #4 Post by **Jujuman** » Thu Jul 19, 2007 7:25 pm

Great work Marko!!!!

What did you use to cover the cab and where did you get it? That is the exact look I am going for also.

Thanks

Michael

#5 Post by **Bill Fitzmaurice** » Thu Jul 19, 2007 9:27 pm

Jujuman wrote:Great work Marko!!!!

What did you use to cover the cab and where did you get it? That is the exact look I am going for also.

Thanks

Michael

It's probably Tolex, but since Marko is in Finland his source probably won't be much use for you.

Marko Ursin · #6 Post by **Marko Ursin** » Fri Jul 20, 2007 12:34 am

Yes, it's tolex.
Marko

Chiplexic · #7 Post by **Chiplexic** » Fri Jul 20, 2007 11:01 am

Did you change the dimensions from the normal Omni Top212 18x22x28 ?
Looks great.

fender3x · #8 Post by **fender3x** » Fri Jul 20, 2007 1:58 pm

That's a really beautiful cab, Marco! Just great!

So many people are using OT12s for bass that it has me wondering about another comparison... O10s and OT12s. It looks to me like there is a lot more output from the OT12, although it is smaller than O10...even when considering that the O10 is 4 ohm and the OT12 is 8 ohm...and an OT12 in the 2x12 configuration has tons more output...although it's also bigger than an O10...

So what would be better for bass?

#9 Post by **Bill Fitzmaurice** » Fri Jul 20, 2007 3:59 pm

fender3x wrote:
So what would be better for bass?

Explained in great detail here:
http://billfitzmaurice.com/phpBB2/viewtopic.php?t=1685

Strapping Young Stu · Fri Jul 20, 2007 5:24 pm

From a tone subtlety POV there are reasons why the OT12 might be louder but not as good sounding as the omni 10

1) Total horn area, the omni10 is higher giving it the ability to go a little lower before the woofer is left to struggle down to the bowels of the range

2) The transient response of two 10" drivers vs one 12". These are things that arent mentioned in charts but a 10" woofer may have a tighter sound for bass than a 12" and you have a pair of these vs a single woofer in the OT - after all there is a reason why people tend to use a 15" + 2x10" or 4x10" for bass and its not just to do with size.

Notice that mackie have just brought out a 4x10 sub to rival its own 1x18" cabs, while the configuration of the 10s is all wrong the punch and "speed" that cab will have over a single 18" will be easily audible. Its like driving a 4 litre van vs driving a 4 litre sports car, the car is smaller and lighter but just as powerful as the van and therefore has more control over its movements

3) Following this same theory of the speakers "as an instrument" the omni 10 has a more favourable frequency curve for bass, optimised as it is to run full range, vs as a mid/high cab. If you run with a sub then OT12 should be superior between 150Hz and about 1kHz, below 100Hz the Omni 10 has a distinct advantage and also in the 2-3kHz range as the crossover between the 10s and tweeters is smoother.

Stu

fender3x · #11 Post by **fender3x** » Fri Jul 20, 2007 7:10 pm

Thanks stu and Bill. The narrative to go with the graphs really helps.

I have a '65 40 W Sunn head... would be fun to try it with an OT12 2x12

Marko Ursin · #12 Post by **Marko Ursin** » Thu Aug 02, 2007 8:57 am

Tested today at rehearsal. Great! Very warm yet clear sounding with 50 tube watt, about 1/4 pre and 1/3 master this setup was loud enough to mix well together with drums and keyboards. And lows are no way thin. The cab was placed on the floor about one feet from wall and ports are facing to the wall.
Marko

Harley · #13 Post by **Harley** » Thu Aug 02, 2007 1:42 pm

Marko Ursin wrote:... And lows are now way thin. ...

??????

Harley

Thu Aug 02, 2007 2:14 pm

Harley wrote:
Marko Ursin wrote:... And lows are now way thin. ...
??????

Harley

I believe he means not boomy.

mchildree · #15 Post by **mchildree** » Thu Aug 02, 2007 2:56 pm

As in "in no way thin"....took me a sec to figure that one out, too!