The Emotiva HC-1 Monoblock Amplifier Dec 4, 2019 16:52:56 GMT -5
Post by garbulky on Dec 4, 2019 16:52:56 GMT -5
Even if it has an XLR input, it is not fully balanced - it is only differential on the inputs. A fully balanced amp is also differential on the amp stages - meaning that there are two amps in there. Emotiva's code word for that is "quad-differential".
Fully balanced requires nearly twice the circuitry so it is expensive to do.
Also....a fully balanced monoblock amp sees the speaker load at half the impedance. So if it's driving a 4 ohm speaker, it's actually seeing a 2 ohm load (!!). If it drops to 2 ohms, it is seeing a 1 ohm load!
What that means is that a proper fully balanced monoblock would be optimized to be able to run stable at very low impedances. The XPA-1 gen 1 and 2 are able to drive not just 4 ohm speakers but also (unoficially) 2 ohm speakers. This means it is seeing a 1 ohm load when driving a 2 ohm speaker and it is built hardy enough to handle it.
A good example of a fully balanced monoblock amp that is NOT optimized for monoblock balanced operation is the Schiit Vidar.
Hence it is ONLY rated for 8 ohm loads in monoblock configuration.
Emotiva amps that are fully balanced are
XPA-1 gen 1 and 2, XPA-1L gen 1 and 2, XPR-1, all models of the XPA gen 3 DR series (DR series only). Emotiva PA-1.
Things that look fully balanced but are not are:
The Emotiva UPA-1, The XPA gen 3 amp with one channel. The XPA HC-1.