Apologies, I posted this in a similar thread, but got no responses.
I need to power 2 pairs of backyard speakers off the same amp. The amp is in the living room and has 1 pair of CAT 5E and 1 pair of 4 conductor running to a junction box near the back door. In the junction box, there are 2 pairs (4 total) of 2 wire conductor that run to the 2 pairs of speakers (see attached diagram).
I have the following equipment (see attached picture)
AV Receiver: Yamaha RX 659 with Zone 2 (internal amp with 1 set of Zone 2/Presence speaker connections) (presently powers inside 5.1 setup (Boston Acoustics 8 ohm)
Outside: 2 pairs of speakers (4 total) Yamaha NS-AW390 6 ohms nominal input 40 w, maximum input, crossover 3khz.
2 Volume Controls: 1 for each pair of outside speakers: Monoprice RMS100 Impedence Input 2 channels, 100 watts per channel Output 2 channels, 4 to 16 ohms impedance matching Frequency Response 35 Hz to 20 kHz (+0/-2 db) at rated power
Wiring: (4 wire cable + CAT 5e) x 2 from wall to volume control box, then 2 wire (black/red)x 2 to outside speakers.
I can't spend any more money, but if need to, can repurpose a AudioSource AMP100 (Don't want to as it in the bedroom for the squeezebox and will power a second pair for the bathroom speakers).
Questions so I don't blow anything up! I reached out to Yamaha support and their answers are below in bold and italics.
1. Can I power both pairs of outside speakers without adding another amp using the internal amp on the AV receiver? (has only one L+R) by wring two Rs into the right and 2 Ls into the left, and how do I do this given I have a 4 wire running between the amp and the volume control?Yamaha said: We only recommend using one pair of 6 to 8 ohm speakers and do not support a speaker selector box.
2. What do I set the impedence matching to on the volume control and the AV receiver?
3. Is there and issue with the 8 ohm speakers on the inside and 6 ohm speakers outside or will the impedence matching volume controls fix this?Yamaha said: "Yes, it will over driver the receiver"Monoprice said: In regards to your inquiry, since the amp is a 8ohm amp then it would not be a issue with running the speakers that are going to be used and 8ohm and 6ohms speakers would not be a issue. Also the impedance matching should be set to 8ohms and would be x2 on the volume controller.
4. What's the 2 CAT 5E for? Future proof?
Thanks in advance!