mokandmartensen.com

Handmade in Germany !

Top-of-the-line integrated amplifier

2 x 1 = A5. That’s our formula for unadulterated musical passion: Starting from a double mono design, with separate power feed, signal processing and amplification, our high-end integrated amplifiers are based on the full scientific spectrum of circuit technology resulting in an enjoyable, outstanding listening experience. We have placed great value on the symbiosis of extremely fine, graceful delivery paired with splendid strength and sound dynamics.

Amplifier technology:

Input switching using premium encapsulated signal relays with gold-plated contacts for optimal signal transmission. The relays are virtually wear-free and have an extraordinarily long life.
For the input stage, AURUM developers use BI-FET operational amplifiers, making AURUM amplifiers especially low in noise and distortion. They also transmit a very broad frequency response.
The result is a significant increase in music reproduction dynamics.

AURUM amplifiers are equipped with studio-quality volume control switching, which makes for precise logarithmic volume setting capabilities. This guarantees that the right and left channels are set to exactly the same volume. Compared to previous technology, this sophisticated technology has the advantage of greater dynamics when playing music.

For the signal paths, our engineers exclusively use premium German-made polypropylene film capacitors, no lossy electrolytic capacitors. This type of signal transmission very effectivel y minimizes distortion.

Even the initial design phase, special attention was paid to especially short signal paths. SMD technology, an innovative technology for developing and producing printed circuit boards, guarantees that the signal is transferred with the least possible interference or loss.

A completely discrete output stage design makes for virtually perfect music reproduction. This demanding but effective type of power amplification also offers reproduction with an especially broad frequency response.

Power transistors from a renowned manufacturer, delivering more than 200 watts, ensure high impulse with clean music reproduction. In addition, these are extraordinarily long-life transistors.

The broader a band an amplifier works with, the more captivating its sound characteristics. Unfortunately, many manufacturers avoid broadband music reproduction, because radiation and vibration make these devices very interference prone. A specially developed passive output filter with a unique handwound coil decouples the speaker from the output stage, thus allowing the AURUM amplifier to operate in broadband without interference.

Previous speaker relays had a natural tendency to wear, which usually led to the speaker channels losing volume or even failing over time. AURUM engineers use a vacuum-welded output relay with a special alloy that prevents this from happening.

Power supply technology:

The AURUM Standby eco-adapter consumes less than 0.9 watts of power.

The transformers have been developed especially for AURUM Electronic. They use innovative spot welding technology and minimize the power adapter’s electromagnetic field. This allows the output stages to operate trouble-free, and all AURUM amplifiers of the same series have the same fascinating sound. • Symmetric disturbances are in every power grid, and asymmetric disturbances through a device’s housing or mass negatively influence an amplifier’s acoustic behaviour. However, these are eliminated by broadband power filters, guaranteeing the greatest possible music enjoyment. Another special filter prevents annoying hum from the toroidal transformer.

Discretely designed rectifiers with 200A ultra-fast recovery Schottky diodes guarantee the amplifier’s interference-free operation.

Five separate electrolytic charging capacitors per channel with a specially developed circuit ensure fast power delivery. This means that AURUM amplifiers play effortlessly even with fast and high impulses.

Protective circuit technology:

In AURUM amplifiers, the protective circuits are not in the signal path, which distinguishes them from many competitors. This principle makes sure the sound is not influenced by the protective circuits.

Ordinary protective circuits limit the current flow early, which leads to bad sound, because the amplifiers have low energy reserve. A dynamic protective circuit developed for AURUM amplifier protects the power amplifier. Thus the three various output sizes are continuously measured and matched to one another. This protective circuit allows the amplifier to work with higher current flows. That leads to dynamic sound with true detail. Additionally, several sensors measure the temperature and switch the device off during overheating and secure it against switching back on. A further protective DC circuit prevent your loudspeaker from malfunction caused by d.c. voltage at the output stage.

Special features of the AURUM A5:

The development engineers have created the AURUM A5 as a true dual mono construction. That means that each channel has its own power supply, its own signal processing, and its own signal amplification. Therefore the channels can operate interference- free and independently of each other. The increased power, dynamics and energy reserves pay off in stable, highresolution sound.

For a strong power supply, the A5 is designed with two separately operating, low-leakage main power adapters, transformers and rectifier lines.

For the sensitive input stage, we use low-noise audio operational amplifiers from Analogue Devices.

Besides optimal signal transmission, the A5 offers the benefits of balanced input (XLR). This process allows signal transmission with an earth conductor that carries no signal flows.

• Technical data A5
• Output power at 8 ohms 100W
• Output power at 4 ohms 150W
• Input sensitivity by 1W at 8 ohms -16,3 dBV
• Frequency response 1Hz-110kHz(-3dB)
• Harmonic distortion <0.03%
• Noise ratio 75dB unrated
• Main connection 115V/230V switchable
• Standby power <0,9W
• Inputs 8x Cinch R/L, 1x symmetrisch XLR
• Dimension (wxhxd) 453 x 130 x 345 mm
• with real wood veneer sides, feets and speaker terminals
• Weight 13,30 kg

Hi-Fi World, UK 09/2011:
The Aurum A5 is an all-rounder who is convincing in all genres and its processing

image hifi 01/2012
„I vote for the A5 without a second thought, because what it can do, it can do masterfully. And I’ll take a touch of character over a slick universalist any day.”

Hifi Test 02/2013
"AURUM A5 and AURUM C5 play with directness, strength and effervescence – it’s a very good hi-fi combo.”