Speaker Pole Mount. For a complete compact system, use the Mackie SPM200 speaker pole to easily mount your speaker on a subwoofer. A heavy-duty pole which is ideal for the following speakers: TH15A, SRM350 (v2), SRM450 (v2), HD1221, HD1521 and HD1531 speakers with SRM1801, HD1501, HD1801 subs and more. An essential optional accessory that can handle up to 110 pounds, the SPM200 lets your audience hear your performance loud and clear.