The SLA Pro was updated January 20, 2016. There is now a four inch woofer version, for use where smaller size is more important than higher output. The reason behind this is the addition of the Eminence Alpha 4 to their lineup. The Alpha 4 has usable response to 10kHz, so it can be used without tweeters if you wish. The four and six inch woofer versions are in the same plans. The standard plans upgrade policy applies.
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Short and Transmission Line Arrays for Pros
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