Mobile Pro Sound Set Up

[Keryn O'Shea]

..If you are considering a pair of T24s, I am wondering if you consider a 12" loaded T48, 24" wide if possible..

Great idea Tom

Are you talking about a Titan 48 loaded with a 12? What would the final dimensions and weight be?

Yes, he is. 24x24x48" l'm guessing an empty cab would be around 65lbs

...what can I expect for performance with, say, an OT8 above each of them?

Goosebumps! Could you stretch yourself to a pair of DR200s though..? They're available in CNC flat pack from Speaker Hardware aren't they?

[Bill Fitzmaurice]

A 24x24x48 T48 comes in closer to 90 pounds, depending on the driver. That's still far less than comparable commercial subs. A Danley TH-112 is 138 pounds. It's also $4k.

[Old Mike]

Will the design be available to us DIY people?

That's up to the manufacturer.

Understood

Mike

[jHands]

..If you are considering a pair of T24s, I am wondering if you consider a 12" loaded T48, 24" wide if possible..

Great idea Tom

Are you talking about a Titan 48 loaded with a 12? What would the final dimensions and weight be?

Yes, he is. 24x24x48" l'm guessing an empty cab would be around 65lbs

...what can I expect for performance with, say, an OT8 above each of them?

Goosebumps! Could you stretch yourself to a pair of DR200s though..? They're available in CNC flat pack from Speaker Hardware aren't they?

The project that I am building is going to be about 6-7 feet in length. The tops will then be, 6-7 feet apart from their center points. I don't want to over do it with the tops. This is also my first build in a long time. I'm no dummy, but I am not sure I want to tackle something that involved my first go around. I am torn between the OT12 and OT8, favoring the OT8. The response chart on the BFM site shows it with the melded array. I would assume that the higher end of the range smooths out with the dual compression drivers with horns?

With regards to the T48, can it be used horizontally? That said, I'm not sure how much that fits the aesthetic of what I am trying to accomplish. The crowd facing facade is going to have the appearance of an 80's boombox. Not sure where the single large vent would fit in that facade.

[Keryn O'Shea]

The project that I am building is going to be about 6-7 feet in length..

Ok, how high off the ground will this Ghetto Blaster be?

This is also my first build in a long time. I'm no dummy, but I am not sure I want to tackle something that involved my first go around.

Fair enough..

I am torn between the OT12 and OT8, favoring the OT8..

Both are great, and will cover your intended audience with a pair. The OT12 could be built lighter if weight is a factor.

The response chart on the BFM site shows it with the melded array. I would assume that the higher end of the range smooths out with the dual compression drivers with horns?

Either sound fantastic with proper EQ, though the melded has the best horizontal dispersion.
Do you know which genres you'll be playing on this system?

With regards to the T48, can it be used horizontally?

Yes

The crowd facing facade is going to have the appearance of an 80's boombox. Not sure where the single large vent would fit in that facade.

Do you want to permanently lock these cabs into a set arrangement? Or could you paint or print the facade onto an acoustically transparent medium, set it on a frame and arrange the cabs inside? Then you're free to use any cab you like, and also set the system up in conventional ways when you're not breakdancing on cardboard

[Bill Fitzmaurice]

With regards to the T48, can it be used horizontally?

Like any and all subwoofers it can face in any direction, so long as the horn mouth isn't blocked.

[Bruce Weldy]

Depending on how low you need to go, you could opt for 2-T30s (lower) or 2-T39s (louder). Both would fit your 6-7 foot span laying down and have the symetrical effect you are looking for. The T30s would be pretty deep vs. the T39s. As far as the tops, OT12s would be the easier and cheaper build. One 12 and one compression driver per box gets the job done.

[jHands]

The ghetto blaster will be on a cart that is approximate 10-11 inches off the ground. I am trying to keep whatever is inside the facade at or around 30 inches tall, so that smaller DJ's don't need a step stool to play - it's hard to dance with the crowd on a step stool lol.

The OT8 is appealing because in the future, I intend to build a full scale PA setup. These could be used as monitors for that set up. I also prefer the form factor of the OT8 to the OT12 for this particular project, because they are taller and narrower versus shorter and wider. Whatever tops I use are going to take away from the aesthetic of what I am trying to accomplish, so I'd prefer them to be taller and narrower, but still maintain good sensitivity for battery usage so column arrays are out.

The genres that will be played will be many, ranging from house to techno to bass to experimental bass. Getting low is important, but I don't expect this system to be able to perform at dubstep levels.

The reason I asked about the OT8 is because the chart shows it with a melded array, and there's a drop off after 10k.I was wondering if that same drop-off happens if you switch to compression drivers in horns. EQ correction is great in the modern era, but I prefer as flat of a line out of the box as possible. Being that whatever top I decide on is going to be deployed 6-7 feet away from its twin, facing its twin in a booth monitoring situation, what high frequency driver set up would you recommend? How important is horizontal dispersion when the other cab is 7 feet away, facing the same direction?

These cabs will be removed from this cart for use in smaller venues as well. They will be placed inside whatever structure is built on the cart, and strapped down accordingly for usage. I hadn't considered an acoustically transparent medium to build the cart walls out of. Do you have any recommendations?

And I don't know how to multi quote for sh_t, sorry lol.

[Keryn O'Shea]

The ghetto blaster will be on a cart that is approximate 10-11 inches off the ground. I am trying to keep whatever is inside the facade at or around 30 inches tall..

Ok, so the tops will be inside this facade with the sub/s at around leg level?

The reason I asked about the OT8 is because the chart shows it with a melded array, and there's a drop off after 10k.I was wondering if that same drop-off happens if you switch to compression drivers in horns.

The OT8 & OT15 share HF options, here's OT15CD charts
viewtopic.php?t=1686

EQ correction is great in the modern era, but I prefer as flat of a line out of the box as possible.

It's been said here that good EQ is mandatory, have you decided on signal processing yet?

..in a booth monitoring situation, what high frequency driver set up would you recommend?

I'll answer from my personal experience, and l'm happy to be corrected here. Any HF option sounds great with the proper EQ, it's a different EQ setting using the same cab as a top vs a monitor, you just spend the time in front of the cab to smooth out the response. Personally l feel the melded array has the best SQ up close. Though l have a set of SLAPs which were praised just recently as DJ monitors, & they only have 4 GT1016s! I have OT8s with CDs, & think they'd be overkill for DJ Monitoring, however EQd accordingly l'm sure they'd be great.

How important is horizontal dispersion when the other cab is 7 feet away, facing the same direction?

I guess not heavily

I hadn't considered an acoustically transparent medium to build the cart walls out of. Do you have any recommendations?

Speaker grille cloth is one, l'm sure others know of more.

And I don't know how to multi quote for sh_t, sorry lol.

Go into "full preview & editor" mode, highlight the text you want to quote, and them click the double comma icon at the top of the post

[jHands]

It appears based on the link you sent that the compression driver evens out the EQ a bit. I intend to run the system through a driverack and use their RTA mic for tuning.

The main facade of the project is going to be a ghetto blaster. Being that I’m using horns, I’m going to artificially create the facade of round speaker grill with 3d printed stuff. I’m going to place the tops at either end on poles to get them above ear level. The boombox facade will be lit up with a ton of LED’s. Casette deck will have LEDS spinning to mimic the tape running etc.

Acoustically transparent material is interesting to me but I haven’t really found much about it yet.

[Keryn O'Shea]

I intend to run the system through a driverack and use their RTA mic for tuning.

Ok great, the PA2?

I’m going to place the tops at either end on poles to get them above ear level.

Excellent, l had thoughts the tops would be inside the structure.

Acoustically transparent material is interesting to me but I haven’t really found much about it yet.

If it's only the subs having to pass waves through the facade, it opens up more possibilities, I'll leave that answer others who know for sure.

The boombox facade will be lit up with a ton of LED’s. Casette deck will have LEDS spinning to mimic the tape running etc.

Awesome

[jHands]

Ok great, the PA2?

Yep the PA2. It seems like the easiest way for a somewhat newbie like me to unlock quality tuning potential.

If it's only the subs having to pass waves through the facade, it opens up more possibilities, I'll leave that answer others who know for sure.

Hopefully more chime in. There's a guy here in Portland that has a cart already, though a very rudimentary one. He has a piece of what seems to be plexiglass completely covering his subs. They are facing the crowd but seemingly straight into a plexiglass layer. There are small holes near the bottom but I believe they are cooling related, not sound related, as that's where is battery bank lives.

[jHands]

With regards to the T48, can it be used horizontally?

Like any and all subwoofers it can face in any direction, so long as the horn mouth isn't blocked.

How far in front of the horn mouth could one reasonably expect to park something and not inhibit the sound reaching the crowd? I am contemplating staggering the subs off one side of the cart, still facing the crowd, but with about 8-12 inches of air gap between the horn mouth and the facade of the project. They'd be enclosed inside the project from their outside edge and what is in front of them, but the back of the project will be open facing the DJ for breathability. Would this impede the sound reaching the crowd, Bill?

[jHands]

By the way, for anyone following, I've decided on T30's for subs. Still undecided on tops, but OT8 or OT12 seem to be the options im leaning towards, with a favor towards the 8 because of the footprint.

[Radian]

Eminence KL3010LF in a standard width T24 is a wicked amount of output for its size.

Have you done any actual testing with it?

Nope. But in the past, I’ve run an entire block party on a pair of 8” loaded Auto Tubas that had the neighbor half a block down the street from us demanding that we turn it down.

Also had a recent audio meetup that crushed it (105 dB SPL) using a pair of vented Lab15’s (which run ~4dB less sensitive than a T24) loafing along at 15V.

Just rough numbers, but I don’t think you’d be disappointed with any of the above suggestions thus far. These things are fun. T30’s dig deeep! Many of us here with a ton of practical experience.