Sound reference SQ 4 channel amplifier


Available on backorder

Available on backorder



Ref Four – Audiophile Acoustics for the Audio Elite

Our Reference series have always been about that little extra, the added experience that is hard to pinpoint, but that makes the sound more sophisticated and refined.
Making the heritage appear clearly, over-sized products can be applied in a wide range of configurations, even those not intended at first.
We have always taken great pride in meticulous R&D to provide premium products, but it has also been a misconception that B2 Audio products might not have been designed
with SQ as a cornerstone.

The Ref Four is a statement to show the contrary. It took numerous prototypes and revisions to ensure it would be catering to the purists and audio elite.
The Reference project has taken almost 2 years to come to a working design that meets our expectations. The profile of the amplifier is more conservative, but that can’t be said for what’s inside.
No compromise

This amplifier is provided without compromise, focusing on dynamics, headroom, and overall sound quality.
Renown component manufacturers such as Mcap, Nichicon, Burr Brown, & IR have been used to fulfill the stringent component level specifications required for this project.
There will always be comparisons to certain brands, but looking at the unique aspects of the Ref Four:

*A heatsink with better heat dispersion, meaning you don’t need fans in the amp.

*Mcap capacitors and burr brown op amps coupled with the finest caps from Nichicon. The cost increase of these compared to no name can easily be 150 times more per unit.

*High precision hand mounted and matched mosfets from International Rectifier, where others use ordinary cheaper Philips screws, we use Allen head, as it not only looks nicer, but it also allows for better mounting.

*Custom specced power supply cover. This may appear that it is for looks only, but there is again a huge cost related to it, as it needs to have a particular surface area allowing the torroid not to overheat, and offers a slight added performance feature as well.

*Class AB to Class A bias mode. Meaning you can drive the amplifier in a full open mosfet configuration to achieve a different sound reproduction that can increase the overall High Fidelity.

*1 ohm stereo option. Due to all the upgrades to the amplifier, the Ref Four is able to run at 1 ohm stereo, this is actually where the amplifier really comes alive and impresses. It was nearly a day & night scenario. Not saying we weren’t impressed by 4 ohm, but there was such a huge difference from 4 ohms to 1 ohm that was nearly unbelievable.

Product Manual

Power Output 12V <1% THD 14.4V <1% THD
Power @ 4 Ω: 4 x 75 w 4 x 125 w
Power @ 2 Ω: 4 x 135 w 4 x 225 w
Power @ 1 Ω: 4 x 190 w 4 x 325 w
Frequency Response: 10 Hz ~ 30 KHz
Signal to Noise Ratio: > 95 dB
Input Sensitivity: 8 ~ 0.1 V
Crossover: 24 dB / Oct
Low Pass Crossover: 40 Hz ~ 4KHz – 24dB
High Pass Crossover: 40 Hz ~ 4KHz – 24dB
Bias Class AB > Class A: Yes
Damping Factor: >300
Power Terminal Gauge: 4 GA x1
Fuse Rating: 120 A
Operational voltage: 11 V ~ 15 V
Dimensions: 15.35 x 8.6 x 2.6” / 390 x 219.5 x 65 mm


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Additional information

Weight 5 kg
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UK Delivery

All items ordered before 14.00pm are shipped the same day unless otherwise stated at the time of ordering. Orders placed after 14.00pm on a Friday will be shipped the following Monday (excluding bank holidays, in which case it will be the next working day). If the item is out of stock for whatever reason you will be emailed within 24hrs to inform you of this. Our site manages stock inventory so if it says ‘IN STOCK’ that means goods are available for immediate dispatch.

  • Shipping will be calculated at the checkout.
  • Free shipping available for customers in the UK mainland ONLY when orders are over £50.
  • We use Interlink Express for all UK next day deliveries (aswell as for orders over £50 if the weight exceeds 2kg) and Royal Mail Recorded Post for orders under 2kg.

Make sure you supply us with a mobile number when you order, then we can give you full tracking information & updates on your order throughout the process.

Clicking on the above image, will also allow you to track your order online. If you have any questions or queries, contact our helpful office team on sales@bladeice.com

Free Delivery

Free delivery is available to UK mainland addresses  ONLY and excludes addresses in the Scottish Highlands & Islands and Northern Ireland. Free delivery is applicable to orders over £50.00 (inc vat) ONLY. This offer doesn’t necessarily mean your goods will be sent on a courier next day service. However assuming the weight exceeds 2kg your goods are usually sent via courier (Interlink Express).

Guranteed 24 Hour

  • Next Day Delivery – Over £50 Inc. VAT – Any weight – Free!
  • Next Day Delivery – 2-5KG – £8.00
  • Next Day Delivery – 5-20KG – £9.99
  • Next Day Delivery – 20-30KG – £11.99
  • Next Day Delivery – 30-40KG – £15.00
  • Next Day Delivery – 45KG+ – £50.00


  • Royal Mail 1st Class Recorded 1-3 working days – Upto 1KG – £4.45
  • Royal Mail 1st Class Recorded 1-3 working days – Upto 1-2KG – £6.90
  • Royal Mail 2nd Class Recorded 2-5 working days – 0-2KG – £3.95


  • Royal Mail Special Delivery Saturday – Upto 2KG – £14.00
  • Courier Saturday – Upto 5KG – £15.95
  • Courier Saturday – 5-20KG – £19.95
  • Courier Saturday – 20-25KG – £22.95

Orders MUST be made before 2pm Friday

Back Order

Items that are listed with ‘Back order’ usually means there is around a 5-10 working day delay for the item to be back in stock. Some items are listed in this way as they are a low volume product and are considered special order with our suppliers.

European & International Delivery

Blade ICE ships internationally to many countries in Europe. Based on the weight of your order shipping will be calculated at the checkout.

Blade ICE reserves the right to charge the full shipping fee applicable to resend if the item is returned to us as the customer was unable to take delivery of the parcel for any reason. Courier returned items will be added back into our stock and your account credited with the order total, minus the fee the courier charges us to deliver the item back to us. You will have to re-place the order to have the item reshipped. If a customer inputs any incorrect details on their order, which causes the parcel to be delivered incorrectly, we will not hold any responsibility for this parcel.

Finally we advise you to check the contents of the order with the inventory sent with the goods. In the rare instance that goods are missing, please contact us within 24 hours and we will happily send out the missing goods at no extra cost to you. If goods are damaged or faulty please inform us within 3 working days of receiving your order.

Please refer to our Terms and Conditions for more information.