Wunder Audio CM7 GS with M7 Capsule

Wunder Audio CM7 GS with M7 Capsule – a professional large-diaphragm tube condenser microphone representing the ultimate evolution of vintage U47 design with modern enhancements. The CM7 G (Glass Tube Switchable) Suprema combines authentic vintage sound with unprecedented versatility, featuring a switchable cardioid mode relay engineered inside the mic capsule compartment plus eight different polar patterns found in a vintage M49, making it like having two microphones in one.

The CM7 GS delivers a smoother, more full-bodied sound through its innovative hard-switched cardioid mode, with the pattern switch located on the PSU but the actual switch point positioned directly below the capsule compartment. The authentic three-layer grille design features outer large mesh, inner medium mesh, and fine mesh sandwiched between, creating acoustic interplay with the capsule and functioning as a Faraday cage. The precision M7 capsule features a brass backplate hand-milled in Switzerland to the original 15/10000th inch specification within one-micron tolerance—a modern upgrade from the original M7's which had up to 0.0002" tolerance, explaining why some new U47s in the 1950s sounded better than others.

The CM7 GS with M7 capsule is equipped with three mounting isolation rims—true to the vintage Berlin M7 and a modern upgrade to the Gefell M7 which has only two—providing improved ground isolation. Capsules are gold-skinned in Germany by master craftsmen. The NOS Telefunken 800 series glass tube is a modern derivative of the vintage steel tube, using the same system construction but in a package less likely to become microphonic. The transformer is a historic recreation wound to original Braunbuch specifications using NOS laminations with authentic vintage Mu-Metal and larger bobbin specs. Teflon wire insulation replaces problematic PVC for 100% reliability. Wunder Audio has enhanced their design with Suprema Silver Gold Oil capacitors featuring 99.99% silver and 1% gold metallization, creating exceptional image depth, enhanced sound staging, air, and transparency with tighter focus and less grain. The proprietary PSU features military-spec Grayhill switch for reliable pattern switching, universal voltage compatibility, and complete RF/Wi-Fi interference shielding.

KEY FEATURES

• Large-diaphragm tube condenser with Glass Tube Switchable technology
• Switchable cardioid mode relay inside capsule compartment for smoother, full-bodied sound
• Eight different polar patterns (vintage M49 configuration) plus hard-switched cardioid
• Two microphones in one: vintage U47 cardioid + multi-pattern versatility
• Precision M7 capsule with Swiss-milled brass backplate (one-micron tolerance)
• Modern upgrade: 15/10000th inch specification vs original 0.0002" tolerance
• Three mounting isolation rims for improved ground isolation
• Diaphragm stretched and glued to rim, never screwed to backplate
• Gold-skinned capsules crafted in Germany
• Three-layer grille mesh with Faraday cage properties
• NOS Telefunken 800 series glass tube (modern derivative, less microphonic)
• Historic transformer with vintage Mu-Metal and NOS laminations
• Larger bobbin specs from early "Large Badge" U47s
• Teflon wire insulation for 100% reliability
• Suprema Silver Gold Oil capacitors (99.99% silver, 1% gold)
• Enhanced image depth, sound staging, air, and transparency
• Proprietary PSU with military-spec Grayhill pattern switch
• Universal voltage compatibility without jumper switch
• 30-turn precision trim pots for voltage fine-tuning
• Complete RF and Wi-Fi interference shielding

TECHNICAL SPECIFICATIONS

• Type: Large-diaphragm tube condenser microphone (Glass Tube Switchable)
• Capsule: M7 capsule with Swiss precision brass backplate
• Capsule Specification: 15/10000th inch rim height, one-micron tolerance
• Capsule Finish: Gold-skinned in Germany
• Isolation Rims: Three mounting isolation rims (Berlin M7 specification)
• Tube: NOS Telefunken 800 series glass tube
• Polar Patterns: Eight switchable patterns plus hard-switched cardioid mode
• Pattern Switching: Internal relay below capsule compartment
• Grille: Three-layer mesh (large, medium, fine) with Faraday cage properties
• Transformer: Historic recreation with vintage Mu-Metal, NOS laminations
• Transformer Bobbin: Large bobbin (early U47 spec)
• Wire Insulation: Teflon (upgraded from PVC)
• Capacitor: Suprema Silver Gold Oil, 1uF capacitance
• Capacitor Metallization: 99.99% silver, 1% gold
• Capacitor Purity: Silver min. 99.97% typ. 99.99%; Gold min. 99.97% typ. 99.99%
• Dielectric: Polypropylene
• Power Supply: Proprietary Wunder Audio PSU, dual-pole neutral-fusing
• Pattern Switch: Military-spec Grayhill switch
• PSU Features: Universal voltage, 30-turn trim pots, RF/Wi-Fi shielding
• Cable: Tube mic cable
• Case: Foam-lined quarter sawn oak box in velvet-lined tweed case
• Included: CM7 GS microphone with M7 capsule, plush oak box, historical shock mount, power supply, tube mic cable, Fender tweed carrying case with leather trim and combination lock