Box Building Premium includes:

All of "Basic" and "Extra", plus:

IASCA Competition and Auto Sound 2000 CD's

The CD's are a helpful tool for tuning systems and boxes. IASCA CD is geared towards systems as well as low frequencies. The Auto Sound 2000 CD is Excellent for subwoofer tuning and testing. It is also good for all frequencies as well as the subwoofer.

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