Directed Electronics HCCA-D1200 Infinite Baffle Example High-PassSet at 30Hz, Enclosure Type

Enclosure Type		Boost Levels
	0dB	+3dB	+6dB	+10dB
Infinite Baffle	Tune above	High X-Max	Not	Not
	Fs of woofer	Drivers--Tune	Recommended Recommended
		above Fs of
		woofer
Sealed	Tune above	Tune above	High X-Max	Not
	Fs of woofer	Fs of woofer	Drivers--Tune	Recommended
			above Fs of
			woofer
Vented	Tune to port	Tune to port	Tune to port	High X-Max
	frequency	frequency	frequency	Drivers--Tune to
				port frequency
Sealed Band-pass	Tune above	Tune above	High X-Max	Not
	Fs of woofer	Fs of woofer	Drivers--Tune	Recommended
			above Fs of
			woofer
Vented Band-pass	Tune to port	Tune to port	Tune to port	High X-Max
	frequency	frequency	frequency	Drivers--Tune to
				port frequency
Aperiodic	Set crossover	Set crossover	Set crossover	Not
	to Fs of	to Fs of	to Fs of	Recommended
	woofer	woofer	woofer

Infinite Baffle Example High-Pass Set at 30Hz

By removing low frequency signal that the woofer cannot produce, the woofer can play its capable range louder. The first example is an infinite baffle situation. The left graph displays the frequency response of a 12-inch woofer in an infinite baffle application without the high-pass filter, with the filter and with the filter and the INTELLi Q set to +3dB. As you can see, with +3dB of boost and the high pass filter set to 30Hz, the woofer has more output down to 25Hz and less overall excursion when compared to the non-high-pass response. Maximum physical excursion capability of the woofer is 15mm.

NOTE: The left graph is the response; the right graph is the driver excursion. These des- ignations apply to the following graphs as well.

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