pics of my DIY 412

I am still waiting for the drivers, coating, speakercloth, and hardware to arrive, so it will be a few weeks untill it is finished.

This cab is meant for rockers: no tweeter, 104 db sensitivity.

 

The drivers are a bit of a secret because i might go commercial with this design.
They are not made by eminence or celestion but by a relatively small manufacturer.
Goal is a vintage looking and sounding cab that can be driven by a relatively small tube amp; 50 watts could be enough.

 

Port noise didnt seem a problem in the simulation. Wheter it will be a problem in the real world remains to be tested. At least the port is on the backside..
The port is 2 inches.

 

It is a really shallow cab. 40 liters per driver.
I really cannot comment on the make of the drivers because of my possibly commercial intentions. This cabinet is sort of an experimental prototype and the experiment may well fail.
-3 db point is comparable to an ampeg 810, so it wont go as deep as other 412's.

 

You are of course completely right. The "speaker mythbusting minds" can deduct from the info given what kind of drivers are used. I have no problems with this. If one seriously thinks of manufacturing cabs then you soon discover that designing the cabs is not the big hurdle; doing so at a competitive price however is...
Many manufacturers list their drivers as 'propriatary'; consider these drivers also 'proprietary' ( sorry for bad english... i'm dutch).

 

That is rather dependant on ones interpretation of usable...
The speakers have output up to 5 Khz, but at that point they will of course beam like mad. Also there is the issue of comb filtering effects because of the driver allignment.
I am kind of gambling on the notion that the beaming will counteract the comb filtering.

 

Thanks.
Building clean is made a lot easier by a biscuit joiner
http://en.wikipedia.org/wiki/Biscuit_joiner

 

Vertical dispersion must obey the same laws and that scares me a bit more to be honest... changing your horizontal position in relation to the cab is easier than changing your vertical position in relation to the cab.

Of course the comb filtering problems also apply to all 410 cabs and those are still popular.

 

Its been a while since i built the cab.
After a long wait the speakers finally arrived, but i had no time to install them and test.
But in the last few weeks i finally found the time.
I played the cab solo and also lent it to some bands performing at a local venue.
The results are positive: it sounds even better than expected.
The definition is better than anything i have ever heard; probably because the bracing is performing better than i expected. Vibration in the cabs walls is almost completely absent even at insane volume. Speaking of insane volume: this cab delivers exectly that. 104 db 1w/1m really is very loud. There is a lack of sub-bass (-3 db point is 60 hertz) but this is no problem in a band context unless you play reggae. You will miss the sub-bass when you play solo, but in band context i did not miss it at all.
Comb filter effects due to speakers allignment are certainly noticable but to my surprise i actually liked them: this way you can make the bassguitar louder where you stand without bandmates complaining you are too loud. I will post more pics when i am ready with the finishing on the cab.