Low Sensitivity 2245

[grumpy]

Not knowing your signal path, amp sensitivity, cabinet tuning, room size,
I'd still say this is not an unexpected result if you're using the 2245 as a
subwoofer... e.g. mostly below 80Hz.

http://audioheritage.org/vbulletin/s...ad.php?t=10632

[JBL 4645]

Rob

I’d also keep an eye on the barograph display less is more! If you can produce less power than is needed and yet get a good frequency coverage from the lowest to its cut-off point then fair enough that’s good because you don’t want to run the amp at needless levels where some sub bass frequencies are stuck in (null spot) that is where you’ll over run it and put needless strain on the amplifier and sub bass speaker.

[robertbartsch]

...as far as I can tell, the Adcom pre amp does not allow individual control of the output signal for each of the 5 channels. My only tool for balancing is the gain controls on each power amp.

[short_circutz]

Don't see how that link relates, as the 4645 is loaded with 2242, not 2245.

The 4245 speaker is a "hifi" (or sound reproduction if you prefer that term) grade speaker and will have less sensitivity than the pro-sound (sound re-inforcement) components that are in your 3 way cabs. They will need more power to match spl levels.

2245: 95dB@1w/1m
2426: 110dB@1w/1m on 2470 horn
2405: 105dB@1w/1m
2226: 97dB@1w/1m

Just to keep up with the 2226's you need almost double the power.

What are you using for power amps?

Travis

[hjames]

...as far as I can tell, the Adcom pre amp does not allow individual control of the output signal for each of the 5 channels. My only tool for balancing is the gain controls on each power amp.

Hmm, sounds like you need a preamp with better controls!

If you're doing 5.1, you'd need room-tune capability -
how do you set up the room without level controls?