Crossover Value Selection - 2226/2446
Hello,
Before I commit to the upgrade of my enclosure and crossover components, I would appreciate the forums input on my decisions.
Crossover:
Current: 500Hz
Propossed: 1600 Hz
LF:
Driver: JBL 2226H
Current Enclosure Volume: 7 cu ft
Propossed Enclosure Volume: 5 cu ft
I have replaced my Eminence 15" Delta Pro with the JBL 2226H. Reducing my current enclosure to 5 cu ft. Two ports - diameter of 4", length 4".
HF:
Driver: JBL 2446J (16 ohm)
Currently my crossover is designed for 500Hz. The crossover will be changed to 1600 Hz, 12dB (2nd order) - Solen cap and Solen air core coil. My choice for L1 is 3.18 mH and C1 3.1uf - the driver is 16 ohms.
Other points of validation:
LF - I am choosing a 0.7 mH inductor for the LF crossover. Should I go air core - if so, what gauge.
HF - What gauge shoould I choose for the HF air core inductor.
Finally: any recommendations on bolt on speaker grills.
Thanks in advance
Jim
I think i know where you are going with this!
Wayne over at Pi speakers uses the 2226 up to 1.6khz to mesh with a 1" driver crossed over at 3rd order 1.6khz.
The coil is not used for crossover purposes but instead reduces a natural rising response of the 2226 between 800hz and 1.6khz.
The 2226 is down 20db at 2khz from what I have read from others.
I use the 2226 in this fashion and find the results quite pleasing depending on the amp/2226 enclosure design and very critical is room placement.
You must get them off the ground to avoid a muddiness at 250hz(common to most woofers/midbass drivers placed close to the ground.
Hope this helps!
Ron
Current Crossover at 500Hz
Thanks for the input on the crossover discussion.
My HF crossover for the JBL 2226J:
1. 500Hz 12dB (2nd order) high pass - Solen cap and Solen air core coil
2. 16ohm L-pad - Dale 1% chassis mount wirewound resistors
3. 16ohm impedance compensation network - Dale 1% resistor and Solen air core coil
4. 7KHz top octave compensation network - Dale 1% resistor and Sprague Orange Drop cap
Changing out the high pass with 3mH and 3uF should take it to 1600Hz.
Does the pseduo 1st order crossover for the LF play with the propossed modifications for the 2nd order HF crossover?
Jim
correction to previous post - 500Hz crossover
oops
Please substitute 2446J (HF) for 2226J (LF) in previous email.
Confirmed - the horn is a 2385A Horn
Had a look at the horn, and confirmed that it was a 2385A based on the engineering drawings.
Does it make sense to cross it at 1600 Hz crossover based on the horn characteristics? If so, I would go with the pseudo 1st order LF crossover.
Otherwise, I would look at the 3110A - and crossover at 800 Hz. Is there a simplified version of the 3110A out there that doesn't have the rotary attenuator - would like to take that out of the circuit if I where to build one.
Thanks
Jim