Chepman 2254BD is a classic (Class A) compressor. Assembled manually on discrete elements (without microchips and surface mounting) and tested with high quality standards.
Symmetrical transformer input, input impedance 10kOm. An interstage transformer separates the VCA and the amplifier unit. The output amplifier operates in Class A and is loaded onto a full-size transformer providing a balanced output.
Honest ByPass. The relay directs the signal from the input to the output bypassing the compressor circuit. When turned off, the device switches to ByPass mode.
Based on the circuitry of classic studio compressors of the 60 - 70s, which can be heard in countless hit recordings, the 2254B will add analog warmth to your signal, so necessary in modern digital studios. Efficiently and delicately works with any signal from drums and bass to vocals. Works great in master sections.

• Frequency Responce

20 - 200 Hz +/-0.5dB

• Mic Pre Input Impedance

10 kohm, balanced

• Noise

-75 dBm in the band from 20 Hz to 20 kHz in the Compression OFF position
-60 dBm at Compression AT and Maximum gain

• Output impedance

80 ohms

• Maximum Output Level

+26dBu @ 600Ω

• Distortion

Compressor off - 0.05%
Compressor Is On, The Ratio Is 6:1 - 0.2%
Compression Ratio
1.5:1, 2:1, 3:1, 4:1, 6:1

• Threshold

-20 dBm to +10 dBm in 2 dBm increments

• Attack time

5 ms in the middle position

• Recovery time

100 ms, 400 ms, 800 MS, 1500 ms, Auto1~500 ms, Auto2~2 S

• Gain Makeup

From 0 to 20 dB in 1 dB increments

• Power Requirements

230VAC/15W

• Dimensions

230 x 160 x 51.5 mm

I was recently provided with a Chepman Audio transistor compressor, model 2254BD.
I decided to test the device at a vocal recording session in a bundle of AKG C12 - Neve 1272 - Chepman 2254BD on male and female vocals, recorded with different settings, with almost any compression, the finished, assembled vocals "Ready to mix" sounded at the output.
The compressor works very delicately. The Chepman 2254BD is ideal for mastering or Bus compression, and we all know that the task is to glue the signal without destroying the transients.
On vocals, he coped on "5+"! As a result, the vocals fit perfectly into the mix, the famous character of the Neve instruments is heard: density, juiciness and liveliness of the timbre in imperceptible proportions.
I would compare the nature of the work with another wonderful device SSL BUS COMPRESSOR, but still the character is slightly different In my opinion, SSL at steeper values is "audible" in contrast to 2254.
About mastering. Recently, I have been using a plug-in from the UAD package on the master bus - SHADOW HILLS MASTERING COMPRESSOR - the coolest thing, I've heard how the iron brother works and it's miracles! UAD is very close to a digital copy, and I definitely like its algorithms.
Here I decided to test the Chepman 2254BD on the master. I took my new dance track, the task is to disperse it loudly - 6.8 RMS, while maintaining a stereo image, maintaining transparency and punch. On Chepman 2254BD, I set the Ratio 3:1, the attack mode A1 and lowered the Treshhold so that the trigger threshold was at - 6db. And I made the same settings on UAD SHADOW HILLS, of course, it's inappropriate to compare them, these are two different devices with different algorithms, but still it was interesting who would do better?! I'll attach the tests later, but my feelings are in favor of Chepman 2254BD! A more open sound, a more natural sound, slightly better preserved transients (which is important in mastering in principle), a denser mix!
My conclusion is that excellent results can be achieved on different equipment. I compress the vocals when recording through 1176, this is also a studio classic like 2254, like LA2A. I think these devices are irreplaceable. Everyone collects their own kitchen and tools, but I want to be an asset of Chepman 2254BD studio!
On loud male vocals, I still got a cleaner, neutral picture, compared to 1176, which is hot with its color, so different instruments are needed to choose!