Yamaha RX-A6 multichannel performance

[Trebdp83]

Some still confuse LFE channel info from 5.1/7.1 signals with low frequencies from 2.0 signals. While both can be output from the subwoofer pre out depending on AVP/AVR settings, they are not the same thing.

This is why Denon/Marantz offers the LFE + Main(Low Frequency Effects from the LFE .1 channel in 5.1/7.1 signals + Low Frequencies from 2.0 signals in the Mains) setting for the Subwoofer output so that lower frequencies from 2.0 signals can be output from subwoofers when speakers are set to Large or when selecting Direct or Pure Direct modes regardless of speaker size settings.

The Yamaha RX-A6A, the actual subject of the thread, has no such feature and like other Yamahas is equipped with Yamaha’s “Extra Bass” feature which should never be used when speakers are set to Small as it actually boosts bass and introduces nasty noise and does nothing for getting sound output from the subwoofer when playing 2.0 signals and set to Pure Direct.

The lack of the “LPF of LFE” feature in Yamaha units means LFE frequency output cannot be adjusted. One might assume it is set at 120Hz but who the f#%k knows?

Without all of the information concerning specific speakers and settings, I wouldn’t say the RX-A6A should not be used to power 4 ohm speakers at all. I’d just be mindful of crossover settings, PEQ settings and volume levels in the receiver for the particular speakers.

Unless one is using the 7.1 EXT. IN on older Denon/Marantz units that bypass all but volume leveling, assume some processing is being done to signals in the unit when using the LFE + Main feature in Direct/Pure Direct mode. I wouldn’t lose any sleep over it. Though, I have been up late tinkering with Spotify lossless output using Spotify Connect and Airplay among different receivers and devices. But, that is for another thread.

 

[PENG]

The fact is, if you connect a 8 ohm resistor to a 16 V source, the current flow will be 2 A whether you measure it upstream or downstream of the resistor load. Same for a filter load such as a series inductor, the current will be the same at the input and output side of the filter.

Unlike something like a mechanical filter (eg paper cone) the electrical filter load (LCR network for passive) enforces the filtered effect/frequency spectrum of the signal right at the connection point at source, ie in this case the amp’s output terminals. If you measure/probe for voltage then yes you won’t see the filtered effect, it will be full bandwidth for both pairs of wires, biwire or not. In that case the current seen by the instrument will be subjected to the very high input impedance of the instrument so any connected filter loads will have insignificant effects.

As you alluded to, I suppose, in the last video, that sometimes there may not be mechanical analogy that fits perfectly to electrical circuit theories.