Well explained, thank you so much for your effort. Confirmed that I choose right configuration for my stereo system, basically relying on guessing. - amplifier with damping factor of 100 or more on 8 ohms load - speaker cable, 32.8 feet (10 m) of about 11 AWG (4 mm^2) - 4 ohms speakers Gives me overall damping factor above 20 (24.39), as well as satisfied "5% rule". All other conditions are met: (more or less) amplifier RMS power, good speakers RMS rated power (about 25% higher, not using preamp tone controls at all), size of room with kind of golden ratio (5:3:2), damped, etc... I only wish I was seen this video earlier.
I get so frustrated when I see a Church sound system that was installed by someone who clearly knew nothing about this! ...and then they wonder why their system sounds "messy". Venue: 650-700 seat room, about 120' wide, 80' deep, 25' ceiling, carpeted, hard/flat L/R walls, non-flat hard ceiling. They are running: (1) Crown CE1000 to power 4 flying Main cabinets (all spaced 15-20' apart), consisting of: 2 x old Yamaha WF112 (8 Ohm 400W program power); 2 x JBL MS112 (8 Ohm, 300W IEC). Each match pair are wired in (get this) parallel (4 Ohms), with s single 16-gauge stranded wire, running 100-120 feet to the amp. Each Main speaker pair (in parallel) is driven by one channel of the CE1000 amp - which does 450W/ch. at 4 Ohms... but the wire adds about 1 Ohm to that, so it's really running at 5 Ohm load, which means it's probably doing 375-400W per channel. My estimate is the DF is down around 4.5 - maybe less due to plenum space wire heating, driving the wire resistance up. (amp DF is >400 10-400Hz,
Well explained, thank you so much for your effort.
Confirmed that I choose right configuration for my stereo system, basically relying on guessing.
- amplifier with damping factor of 100 or more on 8 ohms load
- speaker cable, 32.8 feet (10 m) of about 11 AWG (4 mm^2)
- 4 ohms speakers
Gives me overall damping factor above 20 (24.39), as well as satisfied "5% rule".
All other conditions are met: (more or less) amplifier RMS power, good speakers RMS rated power (about 25% higher, not using preamp tone controls at all), size of room with kind of golden ratio (5:3:2), damped, etc...
I only wish I was seen this video earlier.
I get so frustrated when I see a Church sound system that was installed by someone who clearly knew nothing about this! ...and then they wonder why their system sounds "messy".
Venue: 650-700 seat room, about 120' wide, 80' deep, 25' ceiling, carpeted, hard/flat L/R walls, non-flat hard ceiling.
They are running: (1) Crown CE1000 to power 4 flying Main cabinets (all spaced 15-20' apart), consisting of: 2 x old Yamaha WF112 (8 Ohm 400W program power); 2 x JBL MS112 (8 Ohm, 300W IEC). Each match pair are wired in (get this) parallel (4 Ohms), with s single 16-gauge stranded wire, running 100-120 feet to the amp.
Each Main speaker pair (in parallel) is driven by one channel of the CE1000 amp - which does 450W/ch. at 4 Ohms... but the wire adds about 1 Ohm to that, so it's really running at 5 Ohm load, which means it's probably doing 375-400W per channel. My estimate is the DF is down around 4.5 - maybe less due to plenum space wire heating, driving the wire resistance up. (amp DF is >400 10-400Hz,
you could rewire but I bet 99% of the audience won't be able to tell the difference