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JBL 1400 pro for OB?
JBL 1400 pro for OB?
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Old 1st April 2017, 09:25 PM   #1
crash999 is offline crash999
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Default JBL 1400 pro for OB?

I have purchased a pair of JBL 1400 PROs and for simplicity of box making wondering how they might perform in a OB?
Thiel Parameters
Fs 52
Qts 0.31
Qms 4.1
Qes 0.34
Vas 62.3
Eff 2.5
Pe 600
Xmax 7.62
Re 4.1
Le 0.9
Sd 0.064
Bl 18.4
MMS 85
Flux 0.56

They will be crossed at 160Hz and 800Hz 24Db

Any comments are welcome
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Old 1st April 2017, 09:48 PM   #2
djn is offline djn  United States
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In general a driver for OBs need higher Qts than those. Over .6 or higher.
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Old 1st April 2017, 09:58 PM   #3
Kjeldsen is offline Kjeldsen  Denmark
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High Qts is not mandatory. It will roll off a bit early but some eq can cure that.
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Old 1st April 2017, 10:11 PM   #4
crash999 is offline crash999
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I can cross higher 260 Hz or should I just make a sealed enclosure as per JBL 4890 dimensions. Similar unit was used in the JBL K2.
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Old 2nd April 2017, 11:24 AM   #5
zmyrna is offline zmyrna  United Kingdom
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nice/robust looking drivers
i would not worry about qts if going active/dsp route
a bit more worrying is the Fs
won't be much use below Fs on OB
you may always add subs
and the upper limit should be around 400-500hz (due to dipole peak/null and beaming beyond that)
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Old 2nd April 2017, 02:56 PM   #6
chris661 is offline chris661  United Kingdom
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Below Fs, they'll roll off faster, that's all. Since it's a low-Q driver, EQ is mandatory anyway so it'll just be built-in. Couple of hundred watts will be plenty of headroom even with the EQ in place.

Chris
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Old 2nd April 2017, 07:10 PM   #7
crash999 is offline crash999
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I'm crossing from a JBL 2245, 160 Hz then JBL 2450 800 Hz, in the 4890 systems in a box they cross at 750 Hz so I think I will go that direction. Active crossover with 24 Db slopes. Thanks for the replies.
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