Why passive monitors need the right amplifier
Passive monitors such as older Yamaha NS-10 models depend heavily on the amplifier driving them. Power is only part of the decision: noise, distortion, protection, heat and physical size all influence whether an amplifier is suitable for studio work.
Choosing an affordable amplifier
I did extensive research on the subject until I found an amplifier that wasn't prohibitively expensive, fit a budget, and met quality expectations. I ultimately concluded that with a cheaper amplifier, we wouldn't get the desired results.
Using the Servo 120
So, I purchased the Samson Servo 120 amplifier. My speakers belong to the oldest models, so based on the specifications, the 120 version is more than sufficient. There's simply no need for a higher-power amplifier, as the amplifier already drives the speakers adequately.
One advantage of the device, apart from the good sound quality, is that it's only 1U tall and, although space is tight, the unit doesn't heat up so much that separate cooling is required. There's no fan to create noise.
The speaker can be muted with a button, and it also has additional protection against shutdown, so the speaker doesn't pop when the device is turned off. It mutes the channel, thus protecting the speakers.
The material quality of the device is definitely good; I don't feel like anything has been cut back.
Specifications that matter
The amplifier's signal-to-noise ratio is 105 dB, which is more than sufficient. However, it's crucial that the harmonic distortion, the THD value, is exceptionally low. This is indispensable for high-quality sound, and this device excels in that regard.
Who it suits
If you have lower-power speakers, it's recommended to use them with this amplifier. The manufacturer also has a 200-watt version with roughly the same characteristics. I've been using it for three years without any issues and can confidently say that it sounds great. Despite its low price, I don't perceive any compromises.