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Power amplifiers mono — Limestone PP1
Description, images, technical data and specifications
Limestone PP1
Image source — © Limestone
The PP1 is a mono power amplifier from Limestone, built with a tall, substantial chassis. The PP1 brings considered engineering to dedicated monoblock power amplification.
Key specs that matter
Output power is 45W into 4 ohms - a modest figure suggesting a design prioritising tonal character over raw output, possibly reflecting a tube-based circuit topology. Frequency response spans 30Hz to 30,000Hz within plus-or-minus 3dB. Total harmonic distortion plus noise is 1% with full global feedback, a figure consistent with a tube-informed design philosophy. Note - the source database entry lists dimensions as "250 x 250) x 550," which contains a stray parenthesis suggesting a data entry error in the original source; the intended dimensions are likely 250 x 250 x 550mm, but buyers should confirm the exact figures directly with Limestone or an authorised dealer. Weight is 18kg, reflecting serious internal output transformer and power-supply componentry.
Sound and use context
Expect the rich, harmonically engaging tonal character a likely tube-based circuit topology delivers, with the modest 45W output calling for efficient loudspeakers to reach satisfying volumes.
Pairing
The modest 45W output pairs best with efficient, high-sensitivity loudspeakers.
Alternatives
Other manufacturers' comparably specified monoblock amplifiers offer alternatives for buyers wanting to compare similar tube-informed circuit approaches, pending confirmation of the noted dimension anomaly.
Key specs that matter
Output power is 45W into 4 ohms - a modest figure suggesting a design prioritising tonal character over raw output, possibly reflecting a tube-based circuit topology. Frequency response spans 30Hz to 30,000Hz within plus-or-minus 3dB. Total harmonic distortion plus noise is 1% with full global feedback, a figure consistent with a tube-informed design philosophy. Note - the source database entry lists dimensions as "250 x 250) x 550," which contains a stray parenthesis suggesting a data entry error in the original source; the intended dimensions are likely 250 x 250 x 550mm, but buyers should confirm the exact figures directly with Limestone or an authorised dealer. Weight is 18kg, reflecting serious internal output transformer and power-supply componentry.
Sound and use context
Expect the rich, harmonically engaging tonal character a likely tube-based circuit topology delivers, with the modest 45W output calling for efficient loudspeakers to reach satisfying volumes.
Pairing
The modest 45W output pairs best with efficient, high-sensitivity loudspeakers.
Alternatives
Other manufacturers' comparably specified monoblock amplifiers offer alternatives for buyers wanting to compare similar tube-informed circuit approaches, pending confirmation of the noted dimension anomaly.
Specifications
Model name
PP1
Input sensitivity (mV)
N/A
Input impedance (balanced) (Ω)
N/A
Input impedance (single-ended) (Ω)
N/A
Output impedance (balanced) (Ω)
N/A
Output impedance (single-ended) (Ω)
N/A
Max current (A)
N/A
Output power (8Ω) (W)
N/A
Output power (4Ω) (W)
45
Gain (dBu)
N/A
Frequency response low +/- 3dB (Hz)
30
Frequency response high +/- 3dB (Hz)
30000
Signal to Noise Ratio (dB)
N/A
Total Harmonic Distortion + Noise (0% global feedback) (%)
N/A
Total Harmonic Distortion + Noise (100% global feedback) (%)
1
Max power consumption (W)
N/A
Damping factor
N/A
Dimensions (mm)
250 x 250) x 550
Weight (kg)
18
Official link