4612 project

[OldBlindJim]

For "Baby Cheeks," seems like 2342 would fit....

Just barely. The big issue would be it stick out a bet far.

[OldBlindJim]

- I have a preference in making cabinets as tiny as possible / therefore ( if my project ) , I'd be trying to "get away with it", by using horns as small as possible. As such, I'd force myself to make a higher point work ( in the 2 to 3K region ) . Alas, by the same token, I'd be jettisoning the 2118J(s) for an 8 ohm ( 8" ) woofer with a less obtuse basket ( ie ; something with cut sides ). Both RCF and B&C make very reasonable candidates / with 1.5" & 2" voice coils , respectively. ( FWIW, I also prefer , one woofer to one horn driver for these "mini-upe" designs ) .

Would be cute!

- I wouldn't let an existing "bump" ( say in the area of 1K to 3K ) deter me from going with the higher crossover point. Bumps can easily be handled by LCR notch filters. I believe this site now has enough info in it about LCRs , to help you design your own.
- A series LCR ( paralleled across the driver ) can also be made to work ( ie; offer attenuation ) as long as the filters' Fo point is higher than the F3 point of the lowest pole ( element ) in the lowpass filter .

I have work LCRs before and they can make a big difference. 18 Sound has some kit info and use a LCR in there kit lit. I could pop the circuit into LMS and sweep a 2407 or whatwever I end up with and adjust it until I can get them to flatten out.

[subwoof]

Stay away from the thin-paper 2118 types as they will only crumple and fold with any real signal below 100hz. Same for the ring radiator familybelow 4K. The 2416/17/18 suffer from heat buildup failure unless the duty cycle is very low.

I built a handful of nearfield monitors that had to be wall mounted on the sides of a small stage in Kwest.

I ended up using the automotive GTI1000 10" 4ohm highpower LF and the 2426 on the 2373 ( MR ) horn. To make the cabinet real narrow, I cut about 1.25 off each side of the horn. They are biamped with a DSP at 1.2K

That box kicks butt and can be eq'ed up real close. Another advantage is that it serves as a backup to the house mains should they fail and that has been done a few times...!

If I remember the box is 12 wide, 10 deep and about 17 tall.

My portable system speakers are clones of the 4892-90 ARRAY series that use the 2217H ( ferrite mag ) that is inbetween the 2226 and 2206 in performance / size but it has a squared off frame that is only 12.75 wide!

JBL had a bunch on the tent sale at 145 each last spring but they went fast.

sub

[OldBlindJim]

Stay away from the thin-paper 2118 types as they will only crumple and fold with any real signal below 100hz. Same for the ring radiator familybelow 4K. The 2416/17/18 suffer from heat buildup failure unless the duty cycle is very low.

The 2118 will be in good hands. I have 120hz filters on the mixer channels and I could add subs if need be. I was also thinking about the heat issue and going to a 2426 style driver would be much safer.

[OldBlindJim]

Might be returning to the MTM setup.
Use 2426 type drivers.

[subwoof]

Well depending on your budget, a pair of 2012H 10" cones will give you the output and handling ( 250ea ).

9.25" square frames means a thin box...and the frames are black ( required for cool ).

But then I suggest a pair of 2452's .

THAT would kill on vocals.

sub

[Earl K]

Well depending on your budget, a pair of 2012H 10" cones will give you the output and handling ( 250ea ).

9.25" square frames means a thin box...and the frames are black ( required for cool ).

- I designed up a minitrap that uses 2012s' paired up with 2426H drivers on cutdown RCF 9041 cd horns. Subs are 18" Transparence ( Quebec ) somethings . These 10" minis are head & shoulders the favourite choice of my clients ( from the Corporate side of the business ) .

- An 8" based mini could be usefull / though a lot more limited in overall applications ( even when used in multiples ). I tend to build up inventory in multiples of 8 ( if I like a design ).
- After doing a few industrials with only EAW JF50S / one begins to realize just how small a box, one can get away with / when there are some subs to do the heavy lifting. ( JF50s are a ferro fluid soft-dome tweeter over twin 5 1/2" drivers )

- OBJ was looking for ( the last time I checked ) something to fit nicely into his Subaru ?? station wagon ( if I remember the car correctly ) to support semi-acoustic acts ( such as flamingco acts ).

- ( IMHO ) Dedicating 30" of height to a twin 8" anything is a waste of space . That's generally the standard height of an enclosure with a 15" & a horn ( in some sort of trapezoidal enclosure ). A fifteen or twelve based design will always walk all over anything achievable from two 8 inchers .

- I think I've said enough now / so I'm bowing out .

<> Earl

[OldBlindJim]

Back to the drawing board.
I'll put the 4612 back together, put them on block and start the hunt for a pair of 12" 2 ways.

OBJ

[Zilch]

-- I somewhat walked Zilch & RobH through the process of how these filters "work" ( or don't ) in that position, sometime ago. I don't remember if that particular exercise registered .

I certainly got that they're a shunt, and require source impedance to function....