Iff the 1052 has preout jacks on the back then hook your sub up suing those and then the olume control on the back of the sub can be used. Run you 703s full frequency and set your sub roll off/xover to 10 db above where the 703s start to roll off. i.e if the freq. response on the 703s go down to 45 Hz then set you sub Xover to 55 Hs.
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