MCH-K38

A Reference LE Class Multi-Channel Amplifier

The NuPrime MCH-K38 is a Reference LE class multi-channel amplifier designed for uncompromising home theater and music listening. With its quality parts throughout and an advanced 550kHz switching amplifier operation, the MCH-K38 delivers a full 210 watts into 4 and 8 Ohms per channel. Each pair of output channels can be bridged to double the power to 400W at 4 and 8 Ohms. The NuPrime MCH-K38 comes with 8 sets of RCA and true balanced XLR inputs. A self-resonant design, the amp’s 550 kHz PWM switching frequency constantly adjusts to the input signal, output current demands, and loudspeaker impedance variations. Exemplary speed, accuracy and exquisite dynamics nicely describes NuPrime’s signature sound.

EUR 2,995.00

Category:

The MCH-K38 amplifier is derived from the ULCAM (Ultra Linear Class A Module)+Class D design first introduced in IDA-8. By joining a powerful high impedance single-ended amplifier circuit in the preamp stage with a well integrated Class-D power stage, the MCH-K38’s rich tube-like sound and tremendous speed is sure to impress audio enthusiasts. By utilizing a 1000W power supply and CMA capacitor array, the MCH-K38 fully exploits the Class A+D design’s ability to deliver massive amounts of power and speed when needed by a single or multi channels.

Back Panel

The back panel of NuPrime MCH-K38 consists 4 sets of stereo amplifier output modules. Each set can also be bridged into a mono amplifier making NuPrime MCH-K38 versatile when comes to channel selections. This feature enables MCH-K38 capable of supporting 8 channels (all set to stereo), 7 channels (1 set to mono 3 set to stereo), 6 channels (2 set to mono 2 set to stereo), 5 channels (3 set to mono 1 set to stereo), and 4 channels (all set to mono).

Choose either RCA or XLR input and make sure the switch is properly selected.
Be sure the switch is selected to Stereo.
Be sure the cables are securely connected to the desire input connectors.
Connect the speaker cables to output terminals. Note: The top row is positive and bottom row is negative.

Choose either RCA or XLR connection and make sure the switch is properly selected.
Be sure the switch is selected to Mono.
Be sure the cables are securely connected to the desire input connectors. Please connect to the connectors in white color. Gray connectors do not work in Mono mode.
Connect the speaker cables to output terminals.

  • Inputs:
    • RCA: Un-Balanced input x 8
    • XLR: Balanced input x 8
  • Outputs:
    • Stereo Speaker Out x 8 or
    • Mono Speaker Out x 4
  • Power: 8 X 210W at 4 & 8 Ohms / 4 X  400W @ 4 & 8 Ohms. MCH-K38 is able to maintain the same power rating at 8 Ohms due to a large power supply.
  • Input Impedance: 47k Ohms
  • Input Sensitivity: 1.6Vrms
  • Gain: x 22
  • SNR < -95 dB
  • THD+N: 0.02% (Stereo) / 0.01% (Mono)
  • Frequency Response: 10Hz to 50kHz
  • Worldwide AC voltage: (115 VAC / 230 VAC)
  • AC Fuse: Slow-blow, 7A, 250VAC
  • Dimension:  430.3 mm W x 378.7 mm D x 98.55 mm H (including feet)
  • Weight: 14.5 kg
  • Color: Black

“…I have Audience 2+2 in a stereo system in the bedroom, they have been powered by Cary Audio and Parasound multi channels. Due to the weight and only stereo need i sold the Cary and Parasound for the Nuprime ST-10. I was cautious as i have hated my previous experiments with class d amps such as rotel, pioneer and wyred4sound, all cold and lifeless, boring and flat. The ST-10 was a revelation, sweet, very detailed, tight, extended and bouncy, it had life and was a joyful match with the 2+2’s, i cannot remember a more enjoyable sound in 30 years, especially for the money, and the mids are incredible…

…In my main system i needed to replace my hernia weighted Cary 7 channel, so with my positive experience with the ST-10 I plumped for the MCH-K38 at half the weight of the Cary and hoping it would come close to the exceptional ST-10. The MCH-K38 will be used in a 5.1 system driving Audience 4+4’s when they arrive from the factory. In 5.1 mode the first 4 channels will be bridged and that is how i compared it to the ST-10, not only did it equal the ST-10 but in bridged mode bettered it. Same family signature but just with a more effortless control, more open, less restrained and detailed, I am extremely surprised and very happy, what a combination made in heaven, the Audience and the Nuprime …. rock on…”, – ZAPHOD2012 (audiocircle.com)

→AudioCircle.com MCH-K38 discussion

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Amp & Preamp (3)

D
Can the amplifier’s speaker terminals be used as source inputs (e.g. to REL Subwoofer) ?

In some applications, the speaker outputs from the power amplifier are used as source signals for devices such as REL sub woofer. For such application, usually the receiving devices should have DC offset blocking capability because some amplifier by design has floating ground (DC offset) on the speaker outputs.

The following models have no DC offset on the amplifier speaker outputs and the negative terminal is also the ground:
NuPrime STA-9, MCH-K38, IDA-6, IDA-16, STA-9X, AMG STA

The following models’ speaker outputs can not be connected directly to sub woofer input:
NuPrime Reference 20, ST-10, IDA-8, ST-10M, Evolution One, Evolution Two, Evolution STA, AMG One, MCX-1,2,3,4

REL has provided instructions for connecting Class-D amp with floating speaker outputs to their sub woofers, please contact REL. All currently shipping REL sub woofers can be connected directly to any Nuprime amps.

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D
Speakers for IDA-8 ?

IDA-8 is an extremely popular and award winning integrated amp. New users are welcome to read this long topic on audiocircle.com: http://www.audiocircle.com/index.php?topic=134697.0

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D
What kind of trigger cable can be used for your products?

When a device has a 12V trigger input, it is designed to be turned on when a 12V is detected. You can use any standard male to male 3.5mm (3-pin type) cable.
https://components101.com/connectors/35mm-audio-jack

The Tip section is +12V, the bottom Sleeve section is GND, and the middle Ring section is not used. Nuprime’s trigger design uses 3.5mm stereo cable pin 1 and pin 3. A mono trigger cable shorts pin 2 and pin 3, it can be used to connect the Nuprime device to another device’s trigger that only uses a mono cable.

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MCH-K38 Manual

Nuprime MCH-K38-Service Manual

 

Customer can purchase the optional Remote Control or use a Programmable Remote to control MCH-K38.

NEC Key
CUSTOM CODE 0x00

KEY CODE
000Eh // POWER ON
0010h // POWER OFF
0004h // CH 1
001Ch // CH 2
0000h // CH 3
0002h // CH 4
0003h // CH 5
0006h // CH 6
000Ch // CH 7
0005h // CH 8

MCH-K38

EUR 2,995.00

A Reference LE Class Multi-Channel Amplifier

The NuPrime MCH-K38 is a Reference LE class multi-channel amplifier designed for uncompromising home theater and music listening. With its quality parts throughout and an advanced 550kHz switching amplifier operation, the MCH-K38 delivers a full 210 watts into 4 and 8 Ohms per channel. Each pair of output channels can be bridged to double the power to 400W at 4 and 8 Ohms. The NuPrime MCH-K38 comes with 8 sets of RCA and true balanced XLR inputs. A self-resonant design, the amp’s 550 kHz PWM switching frequency constantly adjusts to the input signal, output current demands, and loudspeaker impedance variations. Exemplary speed, accuracy and exquisite dynamics nicely describes NuPrime’s signature sound.

Category:

The MCH-K38 amplifier is derived from the ULCAM (Ultra Linear Class A Module)+Class D design first introduced in IDA-8. By joining a powerful high impedance single-ended amplifier circuit in the preamp stage with a well integrated Class-D power stage, the MCH-K38’s rich tube-like sound and tremendous speed is sure to impress audio enthusiasts. By utilizing a 1000W power supply and CMA capacitor array, the MCH-K38 fully exploits the Class A+D design’s ability to deliver massive amounts of power and speed when needed by a single or multi channels.

Back Panel

The back panel of NuPrime MCH-K38 consists 4 sets of stereo amplifier output modules. Each set can also be bridged into a mono amplifier making NuPrime MCH-K38 versatile when comes to channel selections. This feature enables MCH-K38 capable of supporting 8 channels (all set to stereo), 7 channels (1 set to mono 3 set to stereo), 6 channels (2 set to mono 2 set to stereo), 5 channels (3 set to mono 1 set to stereo), and 4 channels (all set to mono).

Choose either RCA or XLR input and make sure the switch is properly selected.
Be sure the switch is selected to Stereo.
Be sure the cables are securely connected to the desire input connectors.
Connect the speaker cables to output terminals. Note: The top row is positive and bottom row is negative.

Choose either RCA or XLR connection and make sure the switch is properly selected.
Be sure the switch is selected to Mono.
Be sure the cables are securely connected to the desire input connectors. Please connect to the connectors in white color. Gray connectors do not work in Mono mode.
Connect the speaker cables to output terminals.

  • Inputs:
    • RCA: Un-Balanced input x 8
    • XLR: Balanced input x 8
  • Outputs:
    • Stereo Speaker Out x 8 or
    • Mono Speaker Out x 4
  • Power: 8 X 210W at 4 & 8 Ohms / 4 X  400W @ 4 & 8 Ohms. MCH-K38 is able to maintain the same power rating at 8 Ohms due to a large power supply.
  • Input Impedance: 47k Ohms
  • Input Sensitivity: 1.6Vrms
  • Gain: x 22
  • SNR < -95 dB
  • THD+N: 0.02% (Stereo) / 0.01% (Mono)
  • Frequency Response: 10Hz to 50kHz
  • Worldwide AC voltage: (115 VAC / 230 VAC)
  • AC Fuse: Slow-blow, 7A, 250VAC
  • Dimension:  430.3 mm W x 378.7 mm D x 98.55 mm H (including feet)
  • Weight: 14.5 kg
  • Color: Black

“…I have Audience 2+2 in a stereo system in the bedroom, they have been powered by Cary Audio and Parasound multi channels. Due to the weight and only stereo need i sold the Cary and Parasound for the Nuprime ST-10. I was cautious as i have hated my previous experiments with class d amps such as rotel, pioneer and wyred4sound, all cold and lifeless, boring and flat. The ST-10 was a revelation, sweet, very detailed, tight, extended and bouncy, it had life and was a joyful match with the 2+2’s, i cannot remember a more enjoyable sound in 30 years, especially for the money, and the mids are incredible…

…In my main system i needed to replace my hernia weighted Cary 7 channel, so with my positive experience with the ST-10 I plumped for the MCH-K38 at half the weight of the Cary and hoping it would come close to the exceptional ST-10. The MCH-K38 will be used in a 5.1 system driving Audience 4+4’s when they arrive from the factory. In 5.1 mode the first 4 channels will be bridged and that is how i compared it to the ST-10, not only did it equal the ST-10 but in bridged mode bettered it. Same family signature but just with a more effortless control, more open, less restrained and detailed, I am extremely surprised and very happy, what a combination made in heaven, the Audience and the Nuprime …. rock on…”, – ZAPHOD2012 (audiocircle.com)

→AudioCircle.com MCH-K38 discussion

c Expand All C Collapse All

Amp & Preamp (3)

D
Can the amplifier’s speaker terminals be used as source inputs (e.g. to REL Subwoofer) ?

In some applications, the speaker outputs from the power amplifier are used as source signals for devices such as REL sub woofer. For such application, usually the receiving devices should have DC offset blocking capability because some amplifier by design has floating ground (DC offset) on the speaker outputs.

The following models have no DC offset on the amplifier speaker outputs and the negative terminal is also the ground:
NuPrime STA-9, MCH-K38, IDA-6, IDA-16, STA-9X, AMG STA

The following models’ speaker outputs can not be connected directly to sub woofer input:
NuPrime Reference 20, ST-10, IDA-8, ST-10M, Evolution One, Evolution Two, Evolution STA, AMG One, MCX-1,2,3,4

REL has provided instructions for connecting Class-D amp with floating speaker outputs to their sub woofers, please contact REL. All currently shipping REL sub woofers can be connected directly to any Nuprime amps.

Share
Permalink
Back to Top
D
Speakers for IDA-8 ?

IDA-8 is an extremely popular and award winning integrated amp. New users are welcome to read this long topic on audiocircle.com: http://www.audiocircle.com/index.php?topic=134697.0

Share
Permalink
Back to Top
D
What kind of trigger cable can be used for your products?

When a device has a 12V trigger input, it is designed to be turned on when a 12V is detected. You can use any standard male to male 3.5mm (3-pin type) cable.
https://components101.com/connectors/35mm-audio-jack

The Tip section is +12V, the bottom Sleeve section is GND, and the middle Ring section is not used. Nuprime’s trigger design uses 3.5mm stereo cable pin 1 and pin 3. A mono trigger cable shorts pin 2 and pin 3, it can be used to connect the Nuprime device to another device’s trigger that only uses a mono cable.

Share
Permalink
Back to Top
Customer can purchase the optional Remote Control or use a Programmable Remote to control MCH-K38.

NEC Key
CUSTOM CODE 0x00

KEY CODE
000Eh // POWER ON
0010h // POWER OFF
0004h // CH 1
001Ch // CH 2
0000h // CH 3
0002h // CH 4
0003h // CH 5
0006h // CH 6
000Ch // CH 7
0005h // CH 8