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<blockquote data-quote="helotaxi" data-source="post: 2911903" data-attributes="member: 550915">Good call on the model number on the Concepts, I knew it wasn&#039;t the 97.1.Calling an amp that is stable into a super low impedance making more power as you lower the impedance &quot;underrated&quot; isn&#039;t really accurate.&nbsp; They were usually quite accurately rated.&nbsp; The Orion amps (other than the Concept 97.3) where almost spot on in their ratings at all power levels when you consider that they were rated at say 2x50 @ 4 ohms with 3dB of headroom for the 250HCCA.&nbsp; CSR benched that amp at 107x2 at clipping.&nbsp; That&#039;s pretty accurate.&nbsp; The Concept 97.3 was a different story for the simple reason that the rated power @ 4 ohms was 1x2.&nbsp; It quite easily did 200x its rating.&nbsp; The rating on that amp was an out and out lie.The Soundstream Class A amps weren&#039;t nearly that bad either.&nbsp; The 5.0 was rated at 12.5x2 and the 10.0 was rated at 25x2 for IASCA purposes.&nbsp; Those were the power ratings with the amps operating in high current mode.&nbsp; The ratings in high voltage mode were much higher.The older PG MPS series would run into a dead short as well (seen it demoed) and were rated as &quot;stable into any reactive/inductive load.&quot;</blockquote>

[QUOTE="helotaxi, post: 2911903, member: 550915"] Good call on the model number on the Concepts, I knew it wasn't the 97.1. Calling an amp that is stable into a super low impedance making more power as you lower the impedance "underrated" isn't really accurate. They were usually quite accurately rated. The Orion amps (other than the Concept 97.3) where almost spot on in their ratings at all power levels when you consider that they were rated at say 2x50 @ 4 ohms with 3dB of headroom for the 250HCCA. CSR benched that amp at 107x2 at clipping. That's pretty accurate. The Concept 97.3 was a different story for the simple reason that the rated power @ 4 ohms was 1x2. It quite easily did 200x its rating. The rating on that amp was an out and out lie. The Soundstream Class A amps weren't nearly that bad either. The 5.0 was rated at 12.5x2 and the 10.0 was rated at 25x2 for IASCA purposes. Those were the power ratings with the amps operating in high current mode. The ratings in high voltage mode were much higher. The older PG MPS series would run into a dead short as well (seen it demoed) and were rated as "stable into any reactive/inductive load." [/QUOTE]

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