I am working on a design that employs a pair of 15" drivers in vertical alignment. This configuration provides some vertical dispersion control but of course due to their physical spacing unless one is filtered out, lobbing will occur above 250/300Hz.

I understand jbl do this with one/some of their designs. My question to the forum is this. If you are only going to deploy a simple first order low pass on one driver and run the other full range up to its upper crossover what would be the combined effect in terms of phase and response throughout the "pass band".

I understand that a 6dB/octave lp filter lags at 45 degrees but the second driver will be running full range to its upper point with no hp filter.

I assume of course they will sum at the bottom end where both are active but will there be response anomalies throughout the crossover region or will they remain in phase and sum output?

Thanks!

I understand jbl do this with one/some of their designs. My question to the forum is this. If you are only going to deploy a simple first order low pass on one driver and run the other full range up to its upper crossover what would be the combined effect in terms of phase and response throughout the "pass band".

I understand that a 6dB/octave lp filter lags at 45 degrees but the second driver will be running full range to its upper point with no hp filter.

I assume of course they will sum at the bottom end where both are active but will there be response anomalies throughout the crossover region or will they remain in phase and sum output?

Thanks!

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