JBL 4345 L-Pads replace

[Pavel]

Hello!

The same problem with L-Pad again... And I've decided to replace it this time.

Is it correct spare part: 50W mono 3/8'' shaft 8 Omh?
https://www.parts-express.com/L-Pad-...-8-Ohm-260-252

Thank's, Pavel

[Ian Mackenzie]

If you disconnect the Lpad from the driver and the network you can measure the dcr of the series and parallel resistance of the preferred Lpad setting.

Buy some 5 watt power resisters that are within 10% of your measurements and assemble a fixed pad after disconnecting the Lpad from the crossover and the driver.

Do this for both L + R loudspeakers and you may notice improvement in the imaging and tonal balance. (Match the L+R resister values).

Further improvements can be obtained following the above process with the horn and mid Lpads.

The key is to obtain a system flat setting before you decide to do this.

Soon l will publish an article(s) and a webinar on how to accomplish this important aspect of setting up a multi way loudspeaker such as the 43XX systems.

Ian

[Pavel]

Ian, thank you!
I think it's the most fundamental way to do ))
Are there typical measurements for 0db point for all L-pads?

Article or seminar for this process would be very helpful. Just a brilliant idea, Looking forward for it!

Pavel

[Ian Mackenzie]

There are but there is a bit to get your head around.

Let me work it through and l will keep you informed.

Ian