3-way JBL inspired build - 123A - 2420/2307 - supertweeter - DSP crossover

[TimVG]

Today I installed the 2213nd-1 pair into my cabinets. The difference is not subtle and required a total recalibration of the system. Between 100hz and crossover (1250hz) the system has gained about 4db in sensitivy - Below 100hz the balance shifts and the 123A pair ends up around 2db louder at 50hz. With some recalibration and some bottom end EQ I ended up with more or less the same frequency response, with slightly more emphasis on the mid-range, which was ever so slightly lean before. The 2213nd sounds less colored to my ears and while tuning the system I was able to get away with a 1dB increase between 300 and 900hz (which flattened the response compared to the above register).

I may modify the cabinets in the future and turn them into ported cabinets as I feel this will compliment the new woofers, on the other hand, even with some EQ I'm not running out of headroom.

[berga12]

Step by step...time by time....

you'll be placing a 15"/18" ported below your nice cabinets, and replace the 123A (despite is a nice woofer) with a 2202

Or remove the 12" for a single 15" if you have enough liters (see 4333)

[TimVG]

Step by step...time by time....

you'll be placing a 15"/18" ported below your nice cabinets, and replace the 123A (despite is a nice woofer) with a 2202

Or remove the 12" for a single 15" if you have enough liters (see 4333)

Already replaced the 123A with the 2213nd! See my post above.

[berga12]

I know, but it's just a matter of time... you'll change again!

2213 can't support in a proper way a compression driver and the slot tweeter...

you would need a 15" in addition.

[TimVG]

Match in timbre is good between the compression driver and the 2213nd. I agree one or two 15" woofers would lift the system to a different level, but there is a size constraint. I still have two subwoofers in the back with each 2 x 13,5" drivers and 1kw per box :-)
I also have a 4430 replica in the works..

[berga12]

wow nice!

open a 3D on the 4430, I would like to start also with this build, I've some doubt to find every Crossover component!

[TimVG]

Latest measurements of my system. Purchased a Dayton DSP 408 to fool around with, which is a relatively cheap unit but with potential nonetheless.

JBL 2213nd (24dB octave low-pass @ 1000hz)
JBL 2420 on 2307/2308 horn/lens combination (18dB high-pass electrically @ 1000hz - modified voltage drive between 1khz and 2khz - no low-pass)
JBL 2405 (24dB high-pass @ 16khz)

SVS subwoofer (yet to finetune) takes over below 60hz.

All units time electronically time aligned to the vertical axis of the 2420 (So not aligned at the listening position, but rather as you would simply align the units physically).

Please note filters are electric and the acoustic slopes differ slightly.

Listening window (0° - 10° - 20° - 30° average) @ 1m at acoustic axis between 2213nd and 2308.



L/R speaker average around listening position + L/R average with target curve.

[ivica]

Latest measurements of my system. Purchased a Dayton DSP 408 to fool around with, which is a relatively cheap unit but with potential nonetheless.

JBL 2213nd (24dB octave low-pass @ 1000hz)
JBL 2420 on 2307/2308 horn/lens combination (18dB high-pass electrically @ 1000hz - modified voltage drive between 1khz and 2khz - no low-pass)
JBL 2405 (24dB high-pass @ 16khz)

SVS subwoofer (yet to finetune) takes over below 60hz.

All units time electronically time aligned to the vertical axis of the 2420 (So not aligned at the listening position, but rather as you would simply align the units physically).

Please note filters are electric and the acoustic slopes differ slightly.

Listening window (0° - 10° - 20° - 30° average) @ 1m at acoustic axis between 2213nd and 2308.



L/R speaker average around listening position + L/R average with target curve.

Hi TimVG,

very good results!

regards
ivica

[TimVG]

Hi TimVG,

very good results!

regards
ivica

Thanks!

Here is my latest result after about 10 hours of measuring and dialing in the system. It is an average of around 8 measurements from both speakers around my exact listening position.
2nd graph has a slightly (1dB) more accentuated downward tilted shelf filter in place.
Please note the small dip in the 1kHz-2kHz region does not show up in the nearfield listening window measurements, so I opted not to correct it.

[TimVG]

Time gated measurements @1m. <700hz omitted for this reason.

Black = on axis
Green = listening window
Red = Early reflections