A torroidal transformer has less magnetic leakage than ei type transformers. There are however very efficient ei core transformers like the H type, with very low leakage. Torroidals are smaller for a comparable VA rating. They are more expensive to manufacture however.
They are common for low amperage motor control applications. We see them all the time in commercial lighting and blind controls/drivers.
If a torroidal power supply was super critical in the accuracy of a reproduced signal, they would be used exclusively in high end testing equipment like oscilloscopes. This is not the case. They are very effective when space savings and comparable VA rating are important. You can fit more transformed power into a smaller/shorter enclosure. This important in the it sector, where rack mounting is the norm. Saving RU is saving space and money.
I own torroid amps, ei amps and my HT uses both. There are other factors orders of magnitude more important than transformer type in the sound reproduction outcome. If you are able to see the inside of the 1120 vs 720 you may see they needed to save space for more heatsinking and output transistor mount area for the extra 4 channels of amplification. Enter the torroid.
Edit: Anthem AVRs use a cooling tunnel near the front of the enclosure for their output section it looks like. The 1120 likely has 2 smaller onboard transformers in the black cylinder as opposed to a slightly larger single ei type in their lower tier models.
The 1120 is an attractive option for a single box solution for sure. Atta go Nick!
Last edited by Serenity_Now; 03/11/16 01:19 AM.
