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KA-990 forstærker med både MM og MC indgang til plade spiller sjælden
Varebeskrivelse
Stand: Brugt - men i god stand
Mærke: Kenwood
Kenwood KA-990 new High speed stereo Integrated amplifier me
Spec
Specifications
Power output: 105 watts per channel into 8Ω (stereo)
Frequency response: 20Hz to 20kHz
Total harmonic distortion: 0.005%
Damping factor: 1000
Input sensitivity: 0.2mV (MC), 2.5mV (MM), 150mV (line)
Signal to noise ratio: 69dB (MC), 88dB (MM), 107dB (line)
Output: 150mV (line)
Dimensions: 440 x 143 x 383mm
Weight: 10.7kg
Pre-main amplifier that uses DLD (dynamic linear drive) circuit.
The DLD circuit consists of two amplifiers at the output, a low-power amplifier and a high-power amplifier. Most of the signal is processed by a low-level amplifier with a distortion factor of 0.001% or less. This low-level amplifier can handle up to 50W. Since this amplifier is driven by a power supply that can handle more than 100W, the impedance of the power supply can be reduced, and excellent characteristics are obtained without being affected by the load fluctuation of the speaker.
The high-power amplifier generates little heat and generates almost no internal loss because it is used only for a very short moment when the peak signal passes through.
In addition, a Σ drive system is adopted to improve the performance at the input terminal of the speaker.
This method suppresses distortion of the waveform at the input terminal of the speaker and drives the speaker with a faithful waveform.
We reconsidered the layout of each block and arranged each stage according to the signal flow. In the power amplifier, a large radiator is used to shield the B - and A-class stages, and a dedicated shield plate is used for the equalizer stage to reduce mutual interference.
The power transformer is also shielded to prevent adverse effects on the circuit such as power flux.
The equalizer amplifier uses ICL high GmFET differential inputs and ICs.
In particular, the grounding section, which has a significant impact on sound quality, uses 26 single wires with a diameter of 0.26 mm, with a cross-sectional area six times that of conventional wires.
Gain switching is adopted for MM and MC switching.
The tone control is a trio type NF-CR type with a dedicated IC.
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Sidst redigeret: 7.5.2025 kl. 09:21 ・ Annonce-ID: 9704050
