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BMU 1500 Balanced Mains Unit mk II


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The Balanced Mains 1500

The BMU 1500 mkII™ is the first of our balanced mains units, offering very high performance and is suitable for most small and medium sized systems. The new 'mkII' version has a completely new design which we can confidently say is the best performing version of this model we've ever offered.

The BMU 1500 mkII is capable of powering small and medium sized Hi-Fi and Home Cinema systems and can deliver a massive 31.5KVA - 1500 watts - of pure power via its single transformer technology. The new model features a re-designed internal transformer and the resulting unit is quieter in operation and more efficient than the previous model... what's more, each Balanced Mains Unit is now tailored to your individual set up for the best performance.

The rear of the BMU 1500 mkII is fitted with five UltraSocket™ mains outlets. They are inverted to make plugging in your cables straight forward. Mains input is via a high current, 20A IEC socket and is filtered for additional mains purification. The BMU 1500 mkII is mounted in an equipment-sized fire-resistant ABS case, making it perfect for housing in an equipment rack. It’s heavy, so we recommend sitting it on the bottom shelf.

What is balanced mains?

Electricity delivered to your home is naturally unbalanced; in other words there’s on average 230V on live and 0V on neutral. To ‘balance’ it, you need to split the mains supply and put 115V on live and 115V on neutral. These are 180 degrees out of phase to each other with respect to ground. Any differences between them is zeroed to ground (phase cancellation). The differences essentially being unwanted electrical noise. A lower noise floor is a resultant factor of the balanced power.

Because there’s still a 230V difference between live and neutral at the sockets you don’t need to make any modifications to equipment to work on a balanced mains supply.

What are the benefits?

If you are familiar with balanced audio circuits in Hi-Fi systems, you’ll be aware of the benefits of balanced systems. A Hi-Fi system with a balanced circuit (usually connected together with ‘XLR’ type interconnects) splits the audio signal into two halves – negative and positive. The benefit of this is that ‘noise’ on the positive half of the signal is cancelled out by ‘noise’ on the negative half of the signal. If done correctly, the resulting sound can be of higher quality than an unbalanced circuit.

Many recording studios use a balanced mains supply because it is so very effective at reducing the level of buzzes, hums and induced noise into the audio signal from the mains. The benefit of a balanced mains supply is that both 115V ‘legs’ are of different polarity – so that noise on the live legs is effectively cancelled out by noise on the neutral. It’s this noise cancellation that’s essentially the same as balanced audio.

In our opinion, feeding your system with balanced mains is the very best way to reduce mains noise and get the best performance from your system.

BMU1500 MKII Review

Matching your voltage

Before despatch, each Balance Mains Unit is factory-adjusted to your specific domestic mains voltage for best performance and efficiency. To do this, on receipt of your order we will send you a voltage meter which you should use to monitor your mains voltage over a 48 hour period. Once you have an average figure, we will use this to match the Balanced Mains Unit before shipping.

This is not user-adjustable but can be adjusted free of charge back at the factory if the need arises – for example, if you move house.


Safety is of paramount importance with any electrical item and our BMUs are no different. For your security, all our Balanced Mains Units feature two stage magnetic and thermal protection. The main on/off switch is integrated with a fast acting MCB (magnetic circuit breaker) which immediately cuts power in the event of a fault on the mains wiring. The second stage is thermal protection; an internal cut off switch is fitted to the transformer that will cut power in the event of excessive heat build up.

Which PowerKord?

The BMU 1500 does not come with a mains cable, allowing you to choose our own; we recommend the PowerKord-300 or better, fitted with the 16A IEC.


  • New custom-wound single transformer
  • Internally wired with Kimber Kable
  • Fitted with 5 inverted UltraSockets
  • 1500 Watt output
  • Pre-transformer filtering
  • Hand built to match your mains voltage
  • Cone feet support
  • New bespoke ABS box design with acoustic damping
  • Sleek, black, anodised front panel
  • High Current 20A IEC input
  • 2 stage magnetic and thermal protection
  • Dimensions: 440mm W, 110mm H including feet, 320mm D
  • Weight: 13Kg

  • Money Back Guarantee

    Don't forget! It may be pre-owned, but we’re confident in the performance of this product that it is covered by our 60 Day Home Trial with Money Back Guarantee. Buy the product and if you're not completely satisfied, you can return it within 2 months for a refund. For full details click here.

    choosing your BMU
    A More Detailed Guide

    If you want to confirm which Balanced Mains Unit is suitable for your system and want to check the figures at home, you need to find out the power consumption for your equipment and add them together.

    Maximum power consumption.

    Maximum power consumption is the figure you are looking for; this might be expressed in watts (W) or Volt Amps (VA), but for the purposes of this guide, these can be considered as one and the same. Add together all of the figures for your kit to see what the maximum power requirement is; once you have done this, we recommend the total is no more than 80% of the rating of the Balanced Mains Unit you are looking at.

    For the BMU 1500 which has a 1500VA transformer, your power amp, preamp and sources should not have a power consumption of more than 1200W when connected to the BMU 1500.

    An Example...

    Cyrus Naim Roksan

    As an example,  Cyrus CD XT Signature CD player has a power requirement of about 10W, a Naim ND5 XS 2 streamer has a maximum consumption of about 11W, the Roksan Caspian M2 integrated amp (used as a preamp) has a power consumption of a maximum of 230W and the M2 power amp has a maximum consumption of about 550W. The CD player, streamer and preamp and power amp's power requirement is 801W which, when plugged into the Balanced Mains Unit 1500 equates to about 54% of the power available, leaving plenty of headroom.

    Power consumption vs output power.

    When working out your consumption figures, don't confuse the output power of your amplifier with its power consumption. One amplifier we looked at was capable of outputting 220W per channel, totalling 440W - yet its maximum consumption was nearer 700W. They are related, but maximum consumption is the figure you need to be looking at.

    We're here to help.

    The above figures are used as a guide. It's worth knowing that the calculations refer to conventional amplifiers; Class D amplifiers behave rather differently when calculating power consumption - in this case contact us for more information.

    If at any point you need help or guidance when selecting your Balanced Mains Unit, contact us and we'll be happy to help.

    The ultimate.

    Ultimately, if you want the very best performance you should always opt for the 3000VA unit. BMU3000 supplies more than enough power for almost any Hi-fi and Home Cinema system we've come across. It's also our very best performing unit, so if your object is to achieve uncompromising performance , no matter how big or small your system, you should opt for this model. 

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