Looking for a professional amplifier capable of powering medium to large studio monitors? Check out the Avantone Pro CLA-400 Studio Reference Amplifier, a dynamic, high-output, high-resolution full-range amplification system. Built in the "old school" way, the no-compromise design features high-quality Japanese components, generous VU meters, and a serious toroidal transformer linear power supply. The convection-cooled chassis provides fanless, silent operation, allowing the amplifier to be used in the same room as the monitors.

The CLA-400 boasts a frequency response of 20 Hz to 20 kHz (±0.5 dB) with a power output of 360W at 8 ohms and 540W at 4 ohms per channel. The amplifier can also be used in bridged mode, providing 760W into 8 ohms. The rear panel features two XLR inputs, two XLR link outputs, two speakON connectors, and two sets of terminal block connectors. Both the terminal block and speakON connectors feature bridge configurations for flexibility in deployment. The Avantone Pro CLA-400 produces very-low distortion, steady performance under harsh conditions, and a transparent sound, making it well suited for discerning studios.

Designed for Medium to Large Monitors    360W into 8 Ohms / Class AB Amplifier    High-Quality Components    Toroidal Transformer Linear Power Supply    Large VU Meters    Convection Cooled, No Fans    Works with Any Passive Studio Monitor    Includes Power Cord

• XLR inputs with Link Output per channel
• Analog VU metering
• Monolithic amounts of reference-grade power
• Convection-cooled design for silent operation
• Frequency Response: 20 Hz to 20 kHz (±0.5 dB)
• Class AB amplifier
• Large toroidal transformer linear power supply
• Convection cooled for silent operation (no fans)
• Low noise
• Steady performance
• Open transparent sound

• Stereo power: 360W at 8 ohms
• Stereo power: 540W at 4 ohms
• Bridge power: 760W bridged into 8 ohms

Related Questions and Answers

Q: 1. Are these $100 better than the HD600s?

A: I will address some of these questions I see here. Some posters would have you waiting forever for a price drop. I haven't listened to the HD600s. I find the HD650S well worth the money. I find them comfortable to wear and I have a big head.The sound is superior to the HD598s which I do own. The one drawback to the 650's is that the cord is long and bulky. You will also need an adapter to use them on a phone or tablet. This would also apply to the HD600s as well. To me either these headphones are in your price range or they are not. If not look elsewhere for cheaper.

Q: 2. Are the cables removable/replaceable?

A: Yes."Specially modulated connecting cable (detachable) made from highly conductive OFC copper, with very-low handling noise"

Q: 3. Will the mono switch help detect if one of the stereo channels is out of phase? In other words, if the left channel is 180 degrees out of phase from the right, this can be difficult to detect with headphones, but if the channels are summed to mono, the cancellation should be audible in each ear. Is this the case with this mono switch?

A: THE ONLY THING THAT IS EFFECTED IS THE LOW FREQ. SIGNALS. ONE IN THE RT. EAR & ONE IN THE LEFT. TELLING THE DIFF. IS HARD ENOUGH WHEN THE SOUND IS COMING FROM SPEAKERS. MAKE SURE OF THE SOURCES ARE CORRECT BEFORE YOU START. AS MY DAD ALWAYS TOLD ME WAS KISSKEEP IT SIMPLE STUPID WITH LOVE DR PETE

Q: 4. Please explain the mono switch. What I'm looking for his a device that will mix the stereo channels into mono and deliver the mono signal to both headphones channels. Can this unit do that?

A: The stereo/mono switch sums the stereo input to mono. In this mode all headsets connected will be fed a mono signal. (Same signal to both left and right).

Q: 5. Is this the older model that comes in a silver box or the newer one that comes in a black box?

A: it came with a black box

Q: 6. How can customers make informed decisions when buying headphones from B&H ($500 or otherwise) when frequency response plots aren't provided, let alone +/- on the frequency specs?

A: These are the only hard specs provided by AKG. Frequency Bandwidth: 10 Hz to 39.8 kHzSensitivity: 105 dB/VMaximum Input Power: 200 mWImpedance: 62 ? Truly the best determining factor is an actual audition of the product. B&H offers a 30-day return policy if these headphones are not suitable for any reason at all. AKG does offer a thorough review: a href= http://bit.ly/1yR2NyS target= _blank http://bit.ly/1yR2NyS/a

Q: 7. External DAC drive these like Cambridge, well I still need a headphone amp?

A: If the DAC can handle 300-600 ohm headphones, then you would not need amp amp.

Q: 8. How do the light arms attach to the copystand? Is it a clamp or a permanent mounting bracket that is affixed to the stand?

A: Will this also work with the 47 Motorized Kaiser 205603?

Q: 9. Does the HD650 come with a set of replacement earcups?

A: No they do not,

Q: 10. What is the current draw of the AC power supply?

A: AT this time there isn't much information provided by the manufacturer other than having a 30v input coming from a 130v wall socket.