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Monoprice Monolith M12 v2 subwoofer $300
$300
$1,000
70% off
Monoprice
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The Monolith M12 v2 is a huge, heavy subwoofer that delivers serious bass and looks like a standout value for the output. Setup reports describe clean, punchy low end, strong performance in surround systems, and enough headroom to get loud once calibrated correctly. The main catch is power, since this EU and UK version is 220 to 240 volt and needs a transformer, dedicated 240 volt wiring, or a hardware conversion to run on US power. It is a bargain if you can handle the electrical side and the size.
Common Questions (5)
Yes, a step-up transformer can power it, and several setups report it working well. A 3000W/3000VA unit is the common recommendation for headroom; smaller converters may work, but undersizing can cause heat or clipping.
It is very large for a 12-inch sub and is described as heavier and bulkier than expected, with some comparing its enclosure size to a 12-15 inch class cabinet. Freight delivery and two-person handling were mentioned because the shipment can be around 136 lb on a skid.
No. The EU/UK version is rated for 220-240V, 50/60Hz, and the board is not set up to run on 120V as-is. US buyers need either a step-up transformer, a 240V outlet, or a hardware conversion to use it safely.
Yes, it is repeatedly described as a beast with very strong output, especially after proper setup and calibration. Owners say it adds a lot of sub bass to surround systems and can sound clean with punch and rumble.
Yes. The reported EU/UK-to-US conversion uses a jumper and fuse change, and one parts list says it can be done for about $10 with Digikey parts. After the conversion, it powers up on 120V normally.
AI-generated summary based on comments from the community. Updated ago
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94 Comments
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If they could give me a time, I could have my brother help me lift it off, but since its just a generic 9-6, I will probably be by myself.
How is everyone else dealing with this?
now look at all these people who got great deals because they listened to me and not you.
Things work great out of the box just with a transformer.
It was clearly price mistaked for shipping being free. These things cost a fortune to ship VIA FREIGHT. Look at freight charges.
Congrats on everyone who decided to jump in and get this and not listen to the guy above and a big haha to those who thumbs down me earlier and gave this guy a thumbs up
This is likely to be the subwoofer deal not just of this year but will stand for a good while
now look at all these people who got great deals because they listened to me and not you.
Things work great out of the box just with a transformer.
It was clearly price mistaked for shipping being free. These things cost a fortune to ship VIA FREIGHT. Look at freight charges.
Congrats on everyone who decided to jump in and get this and not listen to the guy above and a big haha to those who thumbs down me earlier and gave this guy a thumbs up
This is likely to be the subwoofer deal not just of this year but will stand for a good while
I wonder why they are shipping freight? It looks like you can ship up to 150lbs on UPS and FedEx before going to freight.
LOLLLLLLLLLLLLLLLLLL
now look at all these people who got great deals because they listened to me and not you.
Things work great out of the box just with a transformer.
It was clearly price mistaked for shipping being free. These things cost a fortune to ship VIA FREIGHT. Look at freight charges.
Congrats on everyone who decided to jump in and get this and not listen to the guy above and a big haha to those who thumbs down me earlier and gave this guy a thumbs up
This is likely to be the subwoofer deal not just of this year but will stand for a good while
This is a much cleaner solution than a transformer adapter, but it requires you have the ability to run 240V to your intended location. In my use case, this is a subwoofer for my outbuilding where I have already wired for 240V, so all it took was a new cord.
For those who don't know what they are doing electrically, you CANNOT simply plug this into a standard 120V household receptacle. Also: None of the 3 power cords provided in the box will work with any readily available 240V plug/receptacle. This is why I recommended a new cord similar to the one I provided a link to. You can also make your own power cord by purchasing just a standard NEMA 240V plug and cutting off the end of one of the monoprice plugs provided.
People who have a dedicated receptacle already wired in their media room could rewire that outlet for 240 by simply replacing the receptacle and swapping to a properly rated 240V breaker in the panelboard.
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This is a much cleaner solution than a transformer adapter, but it requires you have the ability to run 240V to your intended location. In my use case, this is a subwoofer for my outbuilding where I have already wired for 240V, so all it took was a new cord.
For those who don't know what they are doing electrically, you CANNOT simply plug this into a standard 120V household receptacle. Also: None of the 3 power cords provided in the box will work with any readily available 240V plug/receptacle. This is why I recommended a new cord similar to the one I provided a link to. You can also make your own power cord by purchasing just a standard NEMA 240V plug and cutting off the end of one of the monoprice plugs provided.
People who have a dedicated receptacle already wired in their media room could rewire that outlet for 240 by simply replacing the receptacle and swapping to a properly rated 240V breaker in the panelboard.
I wonder why they sent it freight? Regular Fedex can deliver packages that are less than 150lbs. They had to send a giant truck here to deliver it.
Let me know whats the consensus on the transformer to buy.
I think most of the 3000w will work. mine doesn't even get warm and there isnt a sound at all
I think most of the 3000w will work. mine doesn't even get warm and there isnt a sound at all
This is the converter that I bought. It works great and is silent. I bought two M12's and have them both plugged to the one converter and it doesn't even break a sweat. After recalibrating my AVR and adjusting settings, these things get LOUD. For $700 all in for two M12's and the power converter, this is for sure one of the best subwoofer deals Ive seen and taken advantage of.
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This is the converter that I bought. It works great and is silent. I bought two M12's and have them both plugged to the one converter and it doesn't even break a sweat. After recalibrating my AVR and adjusting settings, these things get LOUD. For $700 all in for two M12's and the power converter, this is for sure one of the best subwoofer deals Ive seen and taken advantage of.
The sub came with 3 power cords, Which power cord are you using?
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