Did you have the aftermarket amp connected to both subs, or was it running off of the stock amp? The difference in output could be due to a difference in impedance and sensitivity between the stock sub and the SWS.
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Mobridge DA2 > JBL MS-8 > ARC XDi 600/4 > JBL Gti 408 Mids & Vifa OT19 Tweeters; PG Ti2 1600.5 > Morel HCW-10 & IDMax 15
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