Orion Car Audio HCCA50001 Fine Tuning the Crossovers, Remote Gain Operation, Adjusting Intelli-Q

WARNING! Exercise caution when setting Intelli-Q. Maximum boost can potentially cause woofer damage due to over-excursion.

Fine Tuning the Crossovers

The low-pass and high-pass crossover sections are each marked at four frequency points for ease of system adjustment. The low-pass crossover section is marked at 20Hz, 50Hz, 150Hz, and 300Hz. The high-pass crossover section is marked at 20Hz, 33Hz, 90Hz and 200Hz. Specific crossover points can be chosen based on the recommended operational bandwidth of your speakers.

Remote Gain Operation

The remote gain port provides easy remote access to the internal gain structure of the HCCA power amplifier. The RGC2 plugs into the amplifier via the 1/8” mini jack plug. The RGC2 can be installed in the front of the vehicle to control the amplifier gain level. The RGC2 can be used as a bass level control when used on an amplifier dedicated to subwoofers.

Adjusting Intelli-Q

Incorporated in the high-pass crossover, Intelli-Q maximizes the performance of a subwoofer. The high-pass subsonic filter removes unwanted bass output from the woofer, increasing the output of a subwoofer by as much as 3 dB due to the increased mechanical power handling. Depending on the enclosure, using Intelli-Q can increase the low frequency response by an additional 10dB! The type of enclosure used and the woofer’s excursion capability determine acceptable boost levels. Listed next are recommended boost levels for different enclosure designs.

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

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 first 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

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