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Born To Be Loud!!

Zilch

Zilch

Curve Junkie
Subscriber
1) Prototype project rock stage monitors made of JBL 4646A cabs with 12" 2206H woofers plus 2426J titanium-diaphragm compression drivers on PT waveguides. 110 dB SPL @ ~30W, they'll handle 600W.

2) Custom 1.2 kHz crossovers earlier shown in design stage here:

http://audiokarma.org/forums/attachment.php?attachmentid=57590&d=1187127406

Rear unit under burn-in and test, the front one is ready for installation. Even using 16-ohm HF drivers to minimize attenuation required for driver balancing, there's enough remaining headroom for compensation to extend the VHF out to 18 kHz and beyond.

3) Frequency response rolled off below 100 Hz to minimize bass "muddiness" on stage. Client is constructing wedge cabinets for this combination. Drivers are current JBL production also widely available used.

Yeah, stupid loud....

[Pop quiz: How loud is that with these?]
 

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Changed up the HF for home use using diminutive BMS 4552nd on Engebretson 90° waveguide:

http://www.ddshorns.com/catalog.php?page=ENG190Pro

Added on the requisite sub, last pic. RTA running, background, left.

Biamped and AutoEQ'd, presently, I may have to be working up a passive crossover for these.... :yes:
 

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Zilch said:
1) Prototype project rock stage monitors made of JBL 4646A cabs with 12" 2206H woofers plus 2426J titanium-diaphragm compression drivers on PT waveguides. 110 dB SPL @ ~30W, they'll handle 600W.
...
Yeah, stupid loud....

[Pop quiz: How loud is that with these?]
Click to expand...

You mean max? 10*log(600/30) + 110 = 123dB. Not too shabby if you have a small room. ;)

If the client wants 120+ on a monitor I'm afraid to ask about the house system.

Ray
 
Duhh.......

Hey, Zilch- can I borrow those crossovers next year to do my taxes?

Have they achieved sentience yet? Geez, Dude! Those are Gnarly!:D:thmbsp:

Mirror-imaged too? That's beauty,man.

Later......willhowl
 
similost said:
I'd really like to think those will do a lot better than 123... or is that just at 1w?
Click to expand...
Spec sheet says max continuous sine wave output is 108 dB at 10 feet or 88 dB at 100 feet.

Ray'll have to tell us how that translates to program SPL.

I don't know how apparent it is in the pics, but these are 1.2 cuft boxes, i.e., the size of typical bookshelf speakers. :yes:

[18.75" H x 16.25" W x 10.75" D ]
 
Zilch said:
Spec sheet says max continuous sine wave output is 108 dB at 10 feet or 88 dB at 100 feet.

Ray'll have to tell us how that translates to program SPL.

I don't know how apparent it is in the pics, but these are 1.2 cuft boxes, i.e., the size of typical bookshelf speakers. :yes:
Click to expand...

OOOooohhhh.. that isn't vary apparent.. I thought they were a full sized box... ok.. then those aren't bad ratings at all..
 
Zilch said:
Spec sheet says max continuous sine wave output is 108 dB at 10 feet or 88 dB at 100 feet.

Ray'll have to tell us how that translates to program SPL.
Click to expand...

Depends on how much marketing blood you have in you. The whole program/music power rating thing was thought up by the marketing folks. Best I remember from the commercial world was about 3x power handling for music (due to a ~15% duty cycle as compared to 50% for sine wave) so you'd be looking at another 4.8dB ~113dB at 10'. As a comparison, I believe THX certification specifies 105dB at listening position (probably not too far from 10'). However for whatever reason they (THX) keep these numbers secret so I'm not sure as I didn't pay for them and am working from memory of a long time ago.

I don't know how apparent it is in the pics, but these are 1.2 cuft boxes, i.e., the size of typical bookshelf speakers. :yes:

[18.75" H x 16.25" W x 10.75" D ]
Click to expand...

Good on ya, mate! It seems we have different size bookshelves, but that's still a lotta mojo for a smallish speaker.

Ray
 
In the mean time, smart musicians avoid the deafness-causing monitors and levels mentioned and use in-ear monitors.............
 
mikebake said:
In the mean time, smart musicians avoid the deafness-causing monitors and levels mentioned and use in-ear monitors.............
Click to expand...

Only if they really trust their sound guys. You can do a heck of a lot of damage with in-ear monitors if you're not careful.

My personal preference would be use stage monitors to get above the blowback from the mains and then quality musician earplugs to bring the whole mess down to a manageable level.

Ray
 
Cheap musicians wear in-ear-monitor-looking ear plugs so the audience won't think them to be weenies.... :p:
 
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