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Silent Pound Bloom loudspeaker Measurements

Sidebar 3: Measurements

The Silent Pound Bloom loudspeaker was measured in a large conference room 11'11" H × 25'3" L × 15'8" W on top of a PT&D MDT turntable and with an accelerometer attached to the glass crossover cover. The speaker was measured on the tweeter axis at a 36" microphone distance. From the center of the tweeter to the floor was approximately 58". The first reflection was off the floor at about 5ms, limiting farfield resolution to 200Hz.

The equipment used for the measurements was a GRAS 40BD ¼" microphone and a 26CB preamp, with an SCM2 measurement ¼…

Silent Pound Bloom loudspeaker Specifications

Sidebar 1: Specifications

Description: Three-way, constant-directivity passive loudspeaker. Drive units: Dual 12" woofers in a dipole configuration, 8" midrange with 1.4" compression driver mounted coaxially in a patent-pending enclosure. Crossover: Asymmetrical 3rd–4th order. Crossover frequencies: ~280Hz and ~1.4kHz. Frequency response: 31Hz–20kHz, ±3dB. Sensitivity: 87dB. Minimum impedance: 3.4 ohms. Recommended amplifier power: 80–300Wpc.
Dimensions: 43.3" (1100mm) H × 12.2" (310mm) W × 12.2" (310mm) D. Weight: 88lb (40kg).
Serial numbers of units reviewed: BL25-1421A (…

Silent Pound Bloom loudspeaker Associated Equipment

Sidebar 2: Associated Equipment

Analog sources: Dr. Feickert Woodpecker turntable with inertia platter, Jelco SA-750D tonearm, Stack Audio AUVA Equipment Isolators; Technics SL-1200GAE turntable; Dynavector XX-2 MkII cartridge, Ortofon 2M Black cartridge.
Digital sources: Grimm MU2 streamer/DAC; Shanling ET3 CD & SACD transport.
Preamplification: Grimm MU2, Manley Steelhead (phono), Lejonklou Slipsik 8.
Integrated amplifiers: MBL C51, Devialet Astra.
Loudspeakers: Focal Scala Utopia (1st gen).
Cables: Digital: AudioQuest Carbon AES3; AudioQuest Cinnamon Ethernet;…

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