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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.
DIYers comfortable with a 240V setup, because it can run from a dedicated 240V outlet or a properly sized step-up transformer.
Tinkerers willing to convert the amp for 120V, because the jumper and fuse swap can power it up perfectly on 120V for about $10 in parts.
Home theater owners wanting huge bass output in a large room, because it delivers a ton of sub bass and sounds crazy good when set up correctly.
Bass fans who want a compact-looking bargain, because the 12-inch cabinet is still described as a beast with output that feels far bigger than its size.
Apartment dwellers or anyone short on space, because the cabinet is extremely large and heavy for a 12-inch sub.
Buyers without 220-240V power access, because the EU/UK version cannot simply be plugged into standard 120V household outlets.
People who want a plug-and-play setup, because it may need a transformer, a dedicated 240V circuit, or an internal 120V conversion before it works.
Shoppers expecting an easy carry or simple delivery, because the shipment can arrive on a skid and weigh around 136 pounds.
Common Questions (5)
AI-generated summary based on comments from the community. Updated ago
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94 Comments
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https://www.audioscienc
This will be sub deal of the year
https://www.amazon.com/dp/B0DJ27SNYB/
I dont know much about these converters, so please let me know what will work.
https://www.amazon.com/dp/B0DJ27SNYB/
I dont know much about these converters, so please let me know what will work.
Right on the question section, monprice said:
BEST ANSWER: Hi, thank you for your inquiry. Since this is EU/UK version, this requires 220‑240 V, 50/60 Hz. I hope this helps.
so it does 50/60. All you need is the transformer which is no more than $100 on amazon
https://a.co/d/0gaOAgM9
EDIT: Some receptacles will not play nice with that plug. Some common 240V receptacles have a rejection style ground that will not allow a round ground pin to enter the receptacle. Below is a link to a $4 Amazon plug you can use on a typical home depot 240V receptacle. Just cut off the end of one of the provided Monprice cables and attach this plug. This is definitely the low-cost solution to make the subwoofer work in the US without the eyesore of a transformer (provided you have access to rewire one of the outlets in your room for 240V from your panelboard.
https://www.amazon.com/dp/B0F5Q1X...title
Note that there is no ground connection on this subwoofer, so don't be surprised if you don't see a ground conductor in the cutoff end of the Monoprice cable!
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Its been a good while we had a Monolith sub deal, enjoy
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fwiw
What to watch for
Frequency (Hz) — the bigger concern
- US power is 60Hz, EU/UK is 50Hz
- A step-up transformer outputs 240V but still at 60Hz
- For a subwoofer with a switching power supply (SMPS) — which most modern powered subs use — this is a non-issue. SMPS designs are frequency-agnostic
- For a sub with a linear/toroidal power supply, 60Hz instead of 50Hz is actually better — transformers run cooler and more efficiently at higher frequency
The Monoprice Monolith THX subs are sold in the US at 120V, so if this is a different brand's 240V unit, check the manual or back panel for the power supply type.Transformer sizing
- The Monolith THX 12" draws around 300-400W at peaks
- Get a transformer rated for at least 2× the device's wattage — so minimum 800VA, ideally 1000VA+ for headroom
- Undersized transformers will run hot, clip, and potentially damage the sub or themselves
Plug/socket adapterYou'll also need an IEC or plug adapter to match the EU/UK plug to your transformer's outlet — just a mechanical fit issue, no electrical concern.
Bottom line
Yes, it'll work fine. Just size the transformer generously (1000VA+) and you're good.
You said: so i don't need to worry about frequency?
so i don't need to worry about frequency?
4:30 PM
Claude responded: Correct — don't worry about it.
Correct — don't worry about it.
The Monolith THX 12" uses a switching power supply, and SMPS units internally convert AC to DC immediately and regulate from there. They don't care whether the incoming AC is 50Hz or 60Hz — they work fine anywhere from 50–60Hz (many are even rated 47–63Hz).
The 50/60Hz sensitivity issue really only matters for:
- Old motors (turntables, tape decks) where speed is tied to AC frequency
- Older linear power supplies with large toroidal transformers that are tuned to a specific frequency
A powered subwoofer amp in 2024 is almost certainly switching supply. You're fine.Sign up for a Slickdeals account to remove this ad.
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