Why do you want a coaxial? You are then limited to 1 per stack unless you dont care about comb filtering in which case why are you trying to use such a high quality cab if youre just going to ruin it with bad placement.

 

IMO the Porn V2 is a flawed design because you cant stack if unless you turn it on its side and then the trap shape makes that awkward. The mouth isnt really low enough to get down to 80Hz on its own so you either need a sub that goes up to meet it or multiples (which you cant do without combing)

 

However why Rog didnt seem to care about this I dont know, all I know is that I hear combing, I hear it very clearly, something about my hearing tells me it sounds bad so I avoid it at all costs

 

Stu

 

I am loving the D&B gear these days, the b2 looks wicked.  On a plus point there are links to the C4 top, C4 sub and b2 plans this site, so provides food for thought.

And I agree with HBL, when you listen to them side by side they are very nice indeed

no need to stack them.

 

Bit more expensive than the MX12 though HBL

 

 

Heathrow - I have heard enough Void Cabs to know the quality of Rogs designing and yes you are right its good!

 

Mykey - BUT....

What if you need more SPL?

 

Porn horn is what 106dB with 300W would give a theoretical 131dB which is a fair amount but what happens when you need more? OR more importantly what happens when you need more extension to go down to meet a sub at 100Hz.

 

So the design forces you to choose subs that go up to 140Hz since a) No sane person crosses a single 12" on a horn with a small mouth at 120Hz and b) You need something left in the response of the speaker below the crossover point to make the transition smooth at that frequency.

 

It doesnt cover the vocal range on its own (doesnt go down to 100Hz) so MUST be used in a proper stack with the kick bass at at least chest height or the vocals will sound thin

 

Those arent criticisms for a lot of people because I am sure many will have the ability to set up a system like this - but it means you always have to take out a monster rig to get them to sound good in conjunction with the rest of the rig - Whether they sound good on their own is irrelevant as they dont make up a complete sound system - and you tested them with 4 HDs and 4 X1s!

 

Im sure it sounded great but lack of flexibility is the phrase that comes to mind.

 

Stu

 

when you think it would take 2 or 3 mx12 boxes to be as loud as one porn it soon starts looking like the cheap option.

 

 

 

Yes I do and I have only heard them sounding good when part of a 4/5 way system installed - which is not practical for small scale touring - Double 12 versions of such cabs usually perform a lot better for smaller applications IMO and for me would give a much more useful solution. In the same way that 1x Bass horn is not "useful", 1x12" horn is also not "useful" for a wide range of applications and since the only place the Porn seems to be pushed is this forum surely the design brief is somewhat misguided for the target audience? Either that or the suggested setup - I think setup with 2x12" horns and 1xHF you would have a much more complete system.

 

The Porns dispersion is wide enough that you can only have 2 cabs spaced to handle roughly 180 degrees horizontal and because of its typical horn on top of mid rather than horn alongside mid there is about only one way to stack and thats MTTM so you would have to be content with 4 cabs per cluster if you arranged this way - I presume this is an acceptable compromise for most - Either way I think Rog has missed a trick by not going with a standard double 12" config in keeping with MT122

 

As you say you use double 12"s but reflex are very different things as the stress on a driver below the cutoff of a horn is much greater than in a standard reflex so you can do this - I think thats why 4560 type designs still have their merits.

 

Stu

 

Thats a fair point about the martins

 

If as you say the Porns were designed for touring systems and high end applications then that furthers the mystery of their design - Because the Stasys 3 already exists to fill that market and does so very well and I think last time I checked the Stasys wasnt a great deal more expensive than the Porn but that may have changed

 

Stu

Stasys uses custom drivers AFAIK

 

I think its odd - the MT121 is a good sounding box - why Rog didnt add the Porn horn as a Void Product I dont know

 

Nevertheless Heathrow you were looking at Porn Horn V3 ideas - I doubt there will be one as Rog stated that he barely sold any of the Mk I anyway. But if there is I definitely think a rotatable HF or modular system would be much more flexible

 

Stu

 

 

 

wasn't talking about the porn horn was talking about that horn in the pic

 

 

 

that would be really nice ,a 3 way fully horn loaded loud speaker with phase plug for 6" and a short horn for the 12" 

 

yes i know the stasys 3 but it's not a diy speaker ... ;)

 

i don't found anything on the Limmer + Porn horn/MT12 combo ,have a link ?

 

The Porn Horn v1 was designed to be a narrow dispersion, high output mid top that was to be used in multiples to achieve the desired coverage (think Flashlight)

 

Rog created the Porn Horn v2 because he realised that the majority of people who bought the Porns did so because they were doing medium sized gigs and so needed a mid top that was reasonably loud but could achieve the coverage with only 1 or 2 boxes due to budget constraints normally (think Floodlight)

 

So needing a cab that is 'stackable' was not really on the cards, and besides, I'm not really aware of any non-line array cabs that are designed to be stacked and cover the same areas - they all tend to look for fairly steep cutoffs at the dispersion edges so only a single cab provides sound for each specific area in front of it - specifically to stop comb filtering issues.

 

 

There also seem to be lots of comparisons between Stasys 3 and Porns and price/performance etc.  Again, Rog has explained why Porns are not Void products, etc, etc  Different arenas, different markets essentially, and its hard to see a diy product like the Porn in the Void lineup anyway - I don't think it fits with the image, and it would certainly piss off the corporate clients i'd have thought.

 

Just found this...

 

http://www.speakerplans.com/forum/forum_posts.asp?TID=5941&KW=porn&PID=49800#49800 - http://www.speakerplans.com/forum/forum_posts.asp?TID=5941&KW=porn&PID=49800#49800

if i use a limmer 042 + 12" porn horn v2 (without high section) ,i will get problem with dispersion ? not ?

the limmer is 75° x 45° and the porn horn v2 is 45° x35° ,is this a problem ? 

 

I'm pretty sure the Porn V1 isn't available any more - I don't think they actually sold that many of them in total.  You'd need to contact PAP to find out for sure.

 

a link pleaz ?