I would go with the new Wilson Loke. This subwoofer recently received sterling reviews in both TAS and Stereophile. It goes very deep and its defining quality is its speed. With your speakers a super fast sub is a necessity. Though expensive, I believe Wilson subs are a cut above these other subs. You get what you pay for. You will not be disappointed with a pair of these subs running below your Magnepans.
Best
Charles
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Charles Updated System: Wilson McIntosh Audioquest
Amps: McIntosh MC3500MKII (2); McIntosh MC1.25KW (2); MC2.1KW An (1)
Preamp: C-12000 An
Sources: MCD12000 An; MVP881; MVP851; MR87; Marantz 510LV; ASUS laptop
Speakers: Wilson Audio Specialties Chronosonic XVX
Sub-woofer: Wilson Audio Specialties Thor’s Hammer (1); Wilson ActivXO Stereo Electronic Crossover
Cables main system: Audioquest WEL Signature speaker cables; balanced IC (preamp to main amps); WEL Signature digital coaxial cable for MVP 881/MCD12000; Audioquest Diamond optical (1) for tuner, (1) for MVP 851 DVD player, and (1) for LD player for total of (3); Audioquest Diamond USB cable; Dragon power cords (5 HC cords and 3 source cords for total of 8); Thunder HC power cord for MR87 tuner
Cables subwoofer system: Audioquest Redwood speaker cable (1); Wolf balanced subwoofer IC; Wind balanced IC from preamp to ActivXO; Hurricane HC (3); Hurricane Source (1); Dragon HC (1) power cords
Power conditioners: Audioquest Niagara 7000 (1) and Niagara 5000 (3); (4) dedicated 20-amp lines.
Isolation: Wilson Pedestals; Bassocontinuo McIntosh Ultra Feet; X-material plinth
Cabinet: Double Custom Woodwork & Design (CWD)
Acoustic Treatments: Room and Echo Tunes
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