The Nero MX1250 is a multi-zone amplifier by OSD that delivers 25 watts RMS per channel into 8 ohms and 50 watts into 4 ohms, with 50 and 100 watt peaks. Zone 6 bridges to 100 watts RMS into 8 ohms. OSD do not say how many zones were driven for the measurement.. It was released in 2024. It is a 12-channel design using a Class D output stage. The OSD Nero MX1250 has an MSRP of $800.
Performance Specs
One of the most important factors when deciding on a multi-zone amplifier is its power ratings and compatibility with your speaker's impedance requirements. The OSD Nero MX1250 is rated at 25 watts RMS into 8-ohms.
Here are the main highlights of its performance specs:
- 25 watts into 8-ohms (20 Hz-20 kHz)
- 50 watts into 4-ohms
- 99dB Signal to Noise Ratio
How loud will 25 watts actually play in your room? →
When pairing the OSD Nero MX1250 with a passive Bookshelf (Stand mount) or Passive Floor Standing (Tower) speaker, you have to check if their Max Power Range is below the max wattage of the amp for the given impedance levels.
Operating your amp outside of this max range may damage the speakers.
Inputs and Outputs
Besides the performance specs of the OSD Nero MX1250, the next important feature set that you have to evaluate is the input and output selections that it offers.
OSD Nero MX1250 has total of 2 Analog inputs .
Inputs
- Total Number of Analog Inputs: 2
Outputs
Zones and channels
The OSD Nero MX1250 has
12 amplifier channels, which is
6 stereo zones from one chassis. That is the
number to compare across this category, not the watts: a distribution amplifier is
bought to replace 6 separate stereo amplifiers and the rack
space, mains sockets and cabling that go with them.
Most of these will also run each channel as its own mono zone where a room needs a
single speaker, so the stereo figure above is the conservative reading. As the maker
describes it: Yes (6 zones in one chassis).
What the power figure actually means
OSD Nero MX1250 is rated
25 watts into 8 ohms, but that figure is
not measured with every channel driven. Read the exact conditions
below before comparing it with an amplifier that is. With every zone playing, expect
meaningfully less than 25 watts a channel.
As the manufacturer states it: 25 watts RMS per channel into 8 ohms and 50 watts into 4 ohms, with 50 and 100 watt peaks. Zone 6 bridges to 100 watts RMS into 8 ohms. OSD do not say how many zones were driven for the measurement.
Feeding it
Sources reach the OSD Nero MX1250 at line
level: 2 analogue line inputs.
Everything in this category is designed to sit in a rack behind the scenes, so volume
and source selection are normally handled per zone rather than from a front panel.
OSD Nero MX1250 External Dimensions and Weight
OSD Nero MX1250 has external dimensions of (H x W x D) .
- Width: mm (")
- Height: mm (")
- Depth: mm (")
- Weight: —
- Base Surface Area: ~cm2 / 0.0inch2
- Volume: ~0.0 liter / 0.0 gallon
Official Product Page
Official manufacturer's product page for the OSD Nero MX1250 Integrated Amplifier can be found below:
Official Product Page for OSD Nero MX1250
Warranty
2 Years of parts warranty and 2 Years of labor warranty is generally provided for the OSD Nero MX1250 by the manufacturer.
| General |
| Brand |
OSD |
| Full Model Name |
OSD Nero MX1250 |
| Release Date |
2024 |
| Amplifier Type |
Multi-Zone Amplifier |
| Number of Channels |
12 |
| Amp Class |
Class D |
| Amplifier Technology |
Solid State |
| Performance |
| Watts RMS per Channel into 8-ohms |
25 watts |
| Watts RMS per Channel into 6-ohms |
N/A |
| Watts RMS per Channel into 4-ohms |
50 watts |
| Frequency Bandwidth |
20 Hz-20 kHz |
| THD |
|
| Minimum Impedance |
|
| Signal to Noise Ratio |
99 dB |
| Digital Music |
| Built-in DAC |
No |
| Bluetooth |
No |
| WiFi |
No |
| CONNECTIONS |
| Total Analog Inputs |
2 |
| Phono Input |
No |
| Optical Digital Inputs |
No |
| Coaxial Digital Inputs |
No |
| USB Input |
No |
| Headphone Output |
No |
| Removable Power Cord |
|
| PHYSICAL SPECS |
| Height |
mm (") |
| Width |
mm (") |
| Depth |
mm (") |
| Weight |
— |
| OTHER |
| Parts Warranty |
2 Years |
| Labor Warranty |
2 Years |
How much power does the OSD Nero MX1250 have?
The OSD Nero MX1250 delivers 25 watts RMS per channel into 8 ohms and 50 watts into 4 ohms, with 50 and 100 watt peaks. Zone 6 bridges to 100 watts RMS into 8 ohms. OSD do not say how many zones were driven for the measurement.. Its output almost doubles into 4 ohms, which points to a strong power supply that can hold its composure with demanding, low-impedance speakers.
Does the OSD Nero MX1250 use vacuum tubes?
No. The OSD Nero MX1250 is a solid-state amplifier - there are no vacuum tubes in it.
What amplifier class is the OSD Nero MX1250?
The OSD Nero MX1250 uses a Class D amplifier design. Class D is a modern switching design that runs cool and wastes very little energy as heat, which is how makers fit high power into a compact, light chassis.
Does the OSD Nero MX1250 have a built-in DAC?
No. The OSD Nero MX1250 has no built-in DAC, so a digital source such as a streamer or CD transport needs its own converter, or you connect it over analogue.
Can I connect a turntable to the OSD Nero MX1250?
No. The OSD Nero MX1250 has no phono input, so a turntable needs an external phono preamp (or a deck with one built in) before it can be connected.
Does the OSD Nero MX1250 have Bluetooth?
No. The OSD Nero MX1250 does not have Bluetooth built in; you would need an external Bluetooth receiver connected to one of its inputs.
Does the OSD Nero MX1250 have a headphone output?
No. The OSD Nero MX1250 does not have a headphone output, so headphone listening needs a separate headphone amplifier.
How much does the OSD Nero MX1250 cost?
The OSD Nero MX1250 has a manufacturer's list price (MSRP) of $800.
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