This item was used briefly for a serious in-home entertainment system, in a pet and smoke free environment. I can't use it in my current application. It's been tested and works great!
From the manufacturer:
The ART SLA-4 is a 400W studio linear power amplifier that delivers the clean power necessary for any professional audio or commercial sound environment. A 4-channel, single rack-space amplifier, you can easily switch the ART SLA-4 between multi-channel, stereo, and bridged mono modes. Separate mode switches let you bridge channels one and two, three and four, or both channel pairs for the ultimate in flexibility. A SmartFan cooling system, high-quality decoupling system, and included tamper-proof cover round out the professional ART SLA-4.