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Jeff Rowland Concentra Cascais E Estoril - imagem 1

Jeff Rowland Concentra

2.650 €
JRDG Company Special – Concentra 1

Retail price in 1998 in the Netherlands 7.260 euro

The Concentra is Jeff Rowland’s very first integrated amplifier. More or less a one box version of the Synergy 2 preamp and model 2 poweramp. Put more precisely, the power supply was taken from the Model 2 Amplifier and combined with an output section that resembles that of the model 10 and model 112 power amp. There is no official info on the matter of output stage but from looking at the pictures it seems that the LM3886 integrated amplification circuits have been used instead of bipolar transistors. This integrated has created quite a stir in high-end circles. It had a modest 100 watts of power but just like all Rowland amps, it was much more powerful than these figures would lead you to believe.

The early Concentras had no possibility of putting it into standby or “sleep”. It would always consume a quite large amount of power unless you pulled the plug but that would lead to a long startup time everytime you plugged it back in. The concentra 1 can be identified by its red display. There is an option to upgrade early Concentra units with a “standby” mode that allows the unit to run cool and lower (still around 100 watts measured on a Concentra II) power consumption when not in use; however, the original Concentra cannot be upgraded to Series II status.

Concentra 1 Specifications
Output Power Continuous RMS Watts
8 ohms 100 watts
4 ohms150 watts

0.5 Hz to 160 kHz, -3 dB
Slew Rate
30 volts per microsecond

THD and Noise
Less than 0.06% at rated power

Damping Factor
60, 20 Hz to 20 kHz, 8 ohms

Output Current
16 amps continuous, 28 amps peak

Gain Structure
Preamplifier Section 14 dB
Amplifier Section26 dB

Volume Control Range
99.5 dB

Volume Control Resolution
0.5 dB ±0.05 dB over entire range

Input Impedance
36k ohm

Common Mode Rejection Ratio
Greater than 60 dB, 20 Hz to 20 kHz

Power Consumption
100 watts idle; 550 watts maximum

Balanced Line3 per channel (XLR)
Unbalanced Line3 per channel (RCA)
Record1 per channel (RCA)
Unbalanced Phono (optional)1 per channel (RCA)

Balanced Pre Out1 per channel (XLR)
Unbalanced Pre Out1 per channel (RCA)
Record1 per channel (RCA)
Speaker1 pair binding posts per channel

17.5 in (W) x 14.35 in (D) x 5.75 in (H) 44.5 cm (W) x 36.2 cm (D) x 14.6 cm (H)

50 lbs (23 kg)
  • Publicado às 02:06, 30 Junho 2020
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  • ID do anúncio: 576582832
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Cascais E Estoril, Cascais, Lisboa

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