D series amplifier is a representative products of Calm Audio Electronic Co.,LTD which shows the advanced technology

   A, It used the advanced PWM (pulse width modulation)technology, amplifier operating efficiencies is up to 95%, only about 5% of the output energy changed into heat consumption. Reflecting faster response, higher damping factor, more advanced protection system,it has processed an excellent design of dissipate heat.

   

  B, The interior design of the power supply had used overvoltage and undervoltage protection, power supply over-current protection, temperature protection, limiting voltage protection, which provide a safe power supply system. And this product also has a perfect protection circuit system, comprehensive, safe, reliable, accurate, such as short-circuit protection, overload protection, DC protection and overheating protection etc.

  C, It has achieved the output power from 250w-1400w in the 1U height space.Classical PWM coding technique and more than 300KHZ switch frequency make this product in high quality.

  D, Amplifier makes in modular construction. Very low internal friction, lower static-load operating current, the efficiency of power amplifier has been greatly enhanced.

   

 E, Quite quiet, zero noise, excellent high frequency filtering makes the amplifier a very high S/n ratio( signal to noise ratio).

 

   F, Calm Audio digital power amplifier process superb technology, Lightweight body and the unique performace Patent.

 

MODEL		D250	D450		D650	D800	D1000	D1250	D1400
stereo Power rms	8Ω	2×250W	2×450W		2×650W	2×800W	2×1000W	2×1250W	2×1400W
	4Ω	2×400W	2×650W		2×950W	2×1200W	2×1600W	2×2500W	2×2800W
	2Ω	2×650W	2×900W		2×1400W	2×1800W	2×3000W	2×3900W	2×4300W
THD+N		Rated power,THD=1%,1KHZ<0.06%
max output voltage		60V	70V		73V	80V	89V	99V	105V
Selecteble 1KHZ		29.5db/27.5db/25.5db			31.5db/28.5db/25.3db		33.3db/30.5db/28.5db
Controlled slew rate		61v/us	63v/us		68v/us	76v/us	76v/us	89v/us	100v/us
Input sensitivity		>1v(0dbu)			>1.1v(0dbu)		>1.2v(0dbu)
Smpte IMD		3.15hz-15khz <0.08%
Frequency response		Rated power,20hz-20khz,<+/-0.2db
Input  inpedance		Rated power ,1khz  20 k ohm
(W×D×H)mm		485mm×46mm×47mm
Damping factor over		At 100HZ/1khz 8Ω>900
Signal to noise ratio		1khz,Aweight >108db
Net weigh		8.3kg	8.3kg	8.9kg		8.9kg	9.6kg	10kg	10kg

1 U Digital Amplifier