Bakoon Products AMP-5570 High-End Power Amplifier

As a result of testing a custom-made PA amplifier, the AMP-5570 was found to have so much information that it was hard to believe that it was a PA amplifier, so it was remade as a pure audio amplifier. Since it is for PA, the amplifier circuit does not use SATRI-IC in order to prioritize power and dynamics over the delicacy and accuracy of the sound, and uses the same discrete circuit as the popular limited edition AMP-KUMAMOTO. One of the core technologies of the AMP-5570 is HBK(I)-IC. The official name is HIBIKI, i.e. "Hibiki". In the case of SATRI-IC, the current input and current output are the main features, but when connected to a voltage signal such as CDP, the voltage must be converted into current. On the other hand, in the case of HBK(I), the circuit itself is a voltage input, so there is no need for additional buffering or conversion circuits. Compared to amplifiers equipped with SATRI-IC circuits such as the AMP-5521, the accuracy is an order of magnitude lower, but the sound has a thick line and a sense of power in exchange for the ultra-high precision of the SATRI-IC. Because there is no conversion process and the structure is simpler, the audio signal moves faster and distortion is reduced.
The AMP-5570 can be converted into a monaural amplifier by BTL connection of two amplifiers in the same way as AMP5521 and AMP7511A. By making it monaural, the output of 100W becomes even more powerful at 300W. In addition, the BTL connection can now be easily switched using the input switching dial on the front panel.
The AMP-5570 uses a metal film resistance attenuator as standard, but you can choose a more accurate non-inductive wire wound resistance attenuator.

Balanced Input

The AMP-5570 uses a non-non-NFB SATRI circuit that amplifies with two resistors without using an amplification element. Instead of SATRI-LINK, there is a balance input in the input, so we use OP amplifier for balance amplifier conversion, but when using OP amplifier, the sound becomes thicker compared to pure SATRI-IC circuit. The input is three inputs: balance XLR, unbalanced RCA, and BTL-XLR. In balance XLR, the signal passes through the OP amplifier, but in unbalanced RCA and BTL-XLR, the OP amplifier does not pass through, so it becomes a pure SATRI circuit.
AMP-5570 is equipped with SATRI-IC until nowBakoon ProductsIt is a new era amplifier that has a balance input using an OP amplifier that is not in, and has a upholstery designed for PA, the line is thick and has no current connection characteristic.
Instead of adopting XLR, current transmission (SATRI-LINK) was omitted. Although it is clear that current transmission is technically excellent,Bakoon ProductsYou can enjoy fusion with other amplifiers, and you can also enjoy sound quality changes with various RCA and XLR cables that were useless in SATRI-LINK.

Output	100W + 100W/ 8Ω/distortion 0.8% 300W/ 8Ω/BTL mono use
Input	RCA (Unbalance) (Balance) (Balance Mono) x1
Gain Control	V Metal film resistance ATT (standard )/non-inductive winding resistance (optional)
Distortion (1KHz)	0.1%
S/N ratio	108dB
Frequency Characteristics	10~50kHz
Phase Characteristics	0° / 10kHz
Size	230mm(H) x 440mm(W) x 360mm(D)
Weight	18kg
Power Supply	100V, 120V, 220V, 240V/50,60Hz

*Bakoon ProductsThe logo and name will be changed to SCL (SATRI Circuit Laboratory). Thank you for your understanding.

Metallic film resistance ATT has a very large amount of information, very good sound separation, rich medium to low range representation.
No-induction winding resistance ATT is a natural sound with minimal distortion, very high resolution, rich low range, no habit despite dynamic sound.

In short, AMP-5570 is a meaningless amplifier with new technologies and new circuits applied to existing bakun products. Engineer Nagai explains the technical background at various angles. How is the circuit method, voltage and current, negative feedback, etc... is this really important to us? Everything is said by sound.... But when I examined it from the outside first, it is the size that was not seen in Bacoon until now. Comparable to other flagship amplifiers. It is the size that can remove the stigma of lunch box amp already. When I put it on the rack, I liked the reliable appearance. How important is the visual imprint of the first impression? The exterior part is enough to pass. There is a part that enhances the design perfection of the AMP-5570. On the sharp part above and below the heat dissipation pin that releases heat generated from the amplifier, a protective board folded by the actor was put on for user protection. It is an idea that is innovative and reassuring. In a charismatic pearl-like black front panel, the orange bakelite knob, the identity of Bacoon, comes close with a simple but powerful sensibility.
Let's look at the back. The current transmission (SATRI-LINK) was replaced by XLR. It would be a choice to try to reduce the uniqueness even a little. This makes it easier for high-end users to choose cables. Instead of a BNC cable with a narrow selection, you can connect various RCA and XLR cables that you can get normally. This amplifier can be easily modified with STEREO and MONO. After selecting the front input selector as "BALANCED XLR BTL (MONO)," insert the XLR intercable into the back "BTL MONOULAL SIGNAL INPUT." When connecting the speaker cable, it is necessary to connect to the right speaker terminal + side, and - side to the + side of the left speaker terminal.
The rated output of Bacoon, which was displayed in 15W, 21W, 35W, 97W, etc., is now three digits. 100W per channel. Those who do not know this number may be meaningless, but the 21W 7511 BTL mono amplifier is a Bacoon who taunted the output of other companies' amplifiers while playing with large speakers. For Bacoon's 100W, it should be viewed as possible 600-700W other amplifiers. If you add one AMP-5570 here and plug in the XLR cable and turn the selector into BTL mono mode, it will easily become the 300W monster class amplifier per channel.
Hot air felt through the amplifier body. The warmth that life forms say that I am working properly now. I really liked this warmth that leads to the quality of sound. Some models of Bacoon released in recent years captured accuracy, speed and driving force, but there was a feeling of "cool and clear" of thin sound. The high-end power amplifier had to combine power, speed, and texture, but it was a sound on the boundary line where the texture and heat were moderate. However, the AMP-5570 feels like it adds power, speed and drive to the deep oil-painting colors of the early high-end AMP-5513. The sense of touch of the basic sound is similar to that of the vacuum tube, and the ability to leave the sound from the speaker at high speed is excellent. Send the speaker unit to the exact position with a powerful drive. There is no part where the balance of the band becomes unbalanced. The micro dynamics are also fine and the nuance expression of the performer is outstanding. Also, the quiet background really does not allow other followers. The background is black and it looks like a black hole. Just before the music jumps out, when a weak instrument sound begins in the quiet, like a jet black, it seems to see a line of light in the dark.
If you carefully evaluate it, AMP-5570 seems to negatively affect the company's other amplifier sales. Because it came out with a very realistic price list. For the texture expression of the instrument, I would like to tell you to choose a AMP-5570 from the higher-grade MONO amplifier. When the source is less than two, I think it is very difficult to find other than AMP-5570 if you configure the optimal audio system with one amplifier. In short, it is enough to connect directly to the source and use it like an intiamp. Of course, it is a power amplifier rather than an intiamp, but it is a story that you can use the gain adjustment function unique to Bacoon in volume. Low gain maintains the balance of high, medium and low ranges, and it is possible because there is no constraint on the drive of the speaker.
Bakoon ProductsI've been using it for a long time, but I will be surprised by the past. Quite a lot of manufacturers have already developed circuits and mechanisms to prepare only the chassis and make it new. Of course, improving what we already have can be said to be a development, but it is closer to tuning than to the fundamental technological advancement. To adjust the chassis according to the fashion and replace the parts and materials is to tune the previously developed one according to the preference, not technological progress.
* Monthly Audio (http://www.audioht.co.kr)

Conducted by Michael Tilson Thomas, Mahler's Symphony No. 1 in the San Francisco Philharmonic. Bacoon listening to the current output, the resolution and speed are the first class, and the abundance of musicality is still worthy of praise, but I wondered if it could exceed this level without SATRI-LINK, but it turned out that it was a concern to hear AMP-5570. The amount of information increased, and the depiction and reverberation of the space excelled, each sound added energy and reality. You got a little meat? would you rather say that it was closer to the sound of the instrument? You can feel the weight reliably. I clapped lightly. 。 Next, Jimmy Smith's "The Preacher" live recording was a little rough and attractive. The environment and atmosphere of the recording are fully expressed. Of course the SATRI-LINK amplifier is great enough, but let's say the AMP-5570 is much more real? The color increases, the energy is powerful, and the charm of the music itself impresses the listening side. In particular, it is rich in spatial expression, and the tension around the stage and the reaction of the audience are approaching realistically.
Listen to Hans Zimmer's film "Dunkirk" OST's "Resimental Brothers" with ATC SCM20 Book Shelf Speaker. Play only in AMP-5570. The treble of a very fine violin blooming near the right center shows the presence. In the center of the stage, the slightly sharp texture of the violin doubles the tension of the song, and the loud sound of a thick wind instrument is "scrambled." The drum beat that sounds like a beating is enough and tight. The whole stage is wide and deep. No matter how high the AMP-5570 is, it is wonderful to draw a vast and deep stage with a small book shelf that is not 60 cm tall and has no depth.
100W per channel. Those who do not know this number may be meaningless, but the 21W 7511A BTL mono amplifier played with a large speaker, ridiculing the output of third-party amplifiers. Bacoon 100W must be 600-700W amplifiers of other companies. Simply add one AMP-5570, plug in the XLR cable, and switch the selector to BTL mono mode to become a simple amplifier of the 300W monster class per channel. Gentle heat can be felt through the body of the amplifier... I am very happy that this warmth seems to lead to the sound quality, such as the warmth that the living thing is now active. What about grain standing? Recently released models of Bacoon have accuracy, speed and drive feeling, but have a thin "cool and clear" feel. But the new AMP-5570 eliminated that trend. The basic sound feel is similar to that of a vacuum tube, and the ability to draw sound from the speaker at high speed without a slow corner is outstanding. The powerful driving force allows the speaker unit to be positioned precisely. Therefore, the balance of the bandwidth does not break. Micro dynamics are also well tuned, and the nuances of the performers are excellent. Also, there is no quiet background. The background is like a black hole. The sound of the instrument just before the song comes out starts with a blackish silence, it seems as if the line of light comes out of the dark.
* Monthly Audio (http://www.audioht.co.kr)