If mounted on the same 320Hz exponential horn, yes. The 18 Sound XT1464 cutoff is >500Hz, it's sensitivity
I'd only be guessing at an answer, and it would depend on the horn.
Without knowing the DCX464 and DCX354 Xmax/Xmech, we really don't know the displacement capability.
AES power ratings are a 2 hours test made with continuous pink noise signal (6 dB crest factor) within the specified frequency range, with power calculated at rated minimum impedance. The driver must survive the test, but lack of distortion is not a requirement.
On the 320Hz exponential test horn, at around 320Hz, the DCX354 reaches around 50 Ohms.
Using 27 Volts (90 watts AES power rating) it would be using under 15 watts at 320Hz, but nearly full power at 400Hz (11ohms), it's lower specified frequency range .
At around 320Hz, the DCX464 is 10 Ohms. Using 30 Volts (110 watts nominal AES power rating) would be using around 90watts.
Below it's lower specified frequency range of 300Hz, impedance rises to near 50 ohms.
"Good" is a relative term.
At any rate, compression driver sound when driven to the low frequency limitations are a different issue than surviving RMS and peak voltage swings.
I believe many won't notice the difference as long as the driver continues working ;^).
Art
