Plinius SB301 MK2 Power amplifier


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The PLINIUS SB-301 is our answer to the perennial power versus sonic quality debate. We were approached about 12 months ago by a Californian company engaged in the manufacture of large home theatre speaker systems, and asked to submit an amplifier for their appraisal. There were two important specifications that had to be adhered to, a)the amplifier had to sound good,and b)the amplifier had to sound good at 120dB! We sent them an SA-102 and goal one was achieved. The sound quality was better than anything experienced previously,however under rigorous testing they found that the SA-102 would only deliver 115dB prior to clipping. We then sent an SA-250/4. Goal a and b were surpassed but the SA-250/4 is very large and a little too expensive for the multi-amplifier applications they had in mind. Back to square one and some head scratching.Our design team decided that we needed a 300 watt, SA-102 package and this is exactly what the SB-301 is. The basic circuit topology is the same as the SA-102 but with a larger power supply and more rugged output stage.The number of output devices is double that of the SA-102 and the two toroidal transformers are larger. Operates in Class AB bias and as such the standing temperature is lower than that encountered in our SA series designs. The construction is to the same extreme of quality as the rest of the PLINIUS line and offers the rugged dependability of the SA series designs. It is widely believed that as amplifier power increases the sonic ability diminishes. Clearly dispels this notion and will deliver all the dynamics,finesse and transparency that PLINIUS is renowned for. At home in the most demanding music or theatre applications and will perform flawlessly under the most arduous conditions.

Power:     310 watts continuous per channel into 8 ohms. Both channels driven from 20Hz to 20kHz
Frequency Response:     20Hz to 20kHz ±0.2dB. -3dB at 70kHz
Distortion:     Typically 0.05% THD at rated power. 0.1% THD and IM worst case prior to clipping
Current Output:     100A short duration peak per channel. Fuse protected
Rise Time:     Typically 5µs
Hum & Noise:     100dB below rated output 20Hz to 20kHz A-weighted
Input Impedance:     47,000 ohms
Gain on RCA Inputs:     32dB
Gain on Balanced Inputs:     38dB
Dimensions:     Height 220mm (8.75"), Width 500mm (19.75"), Depth 455mm (18"), Weight 38kg (83lb)

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Providing your item is in stock, the order is usually dispatched within 24 hours. Please remember that postage and packing is completely free for orders over £50*. Out of stock items will be dispatched as soon as they become available, out of stock items can take between 4 to 21 days for dispatch.

Deliveries usually take 1-3 working days. The majority of orders are sent via our couriers'; Interlink Express on a next-day-delivery service. Smaller, low value or light-weight items are normally posted using Royal Mail Recorded or Royal Mail Special Delivery.

Once your product has been dispatched, you will be notified via email and sent a unique consignment number, you can use this number at to check the status of your delivery. If you have provided a mobile telephone number, Interlink's Predict service will notify you by text (and email) of a one-hour delivery window. If the window they suggest is inconvenient, you can change the date of delivery to a later one via text or email.

*We ship free of charge to mainland UK addresses, excluding the Scottish Highlands or 'Out-Of-Reach' Scottish locations. Please consult the post-codes below to see if your location falls within this category. If you are still unsure, please contact us on 01432 354921. We also ship to Northern Ireland, Channel Islands, Scilly Isles, Scottish Isles and Scottish Highlands, however delivery to these locations will incur a charge and can only be sent via a 2-day service.

Shipping CostsMainland UK (Next-Day)Offshore/Out-of-reach (2-day)Northern Ireland, Channel Islands, Isle of Man, Scottish Islands, Scilly IslandsRepublic of Ireland (2-day)
Under £50 Orders £7.50 £12.50 £15.00
Over £50 Orders FREE £19.99 £29.99
Surcharge Orders £50.00 £69.99 £79.99
Saturday Delivery £12.99 N/A N/A
Sunday Delivery £12.99 N/A N/A
Saturday by 12 Delivery £35 N/A N/A


Post codes exempt from the free delivery service include:

Scottish Highlands Post Codes: AB30-38, AB41-42, AB44-56, FK17-99, G83, IV1-28, IV30-39, IV52-54, IV63, KW1-14, PA21-33, PA34-40, PH15-26, PH31-41, PH49-50
Islands Post Codes: HS1-9, IV40-51, IV55-56, KA27-28, KW15-17, PA20, PA41-49, PA60-78, PH42-44, ZE1-3
Northern Ireland: All BT postcodes
Channel Islands Post Codes: JE, GY
Scilly Isles Post Codes: TR21, TR22, TR23, TR24, TR25