150 - 200 Hz. If you're careful you can go lower (don't play them full blast), but I would never recommend playing 4s below 100 Hz.
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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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