Ishom,
The NX4-6000 is an updated version of the NU4-6000.
I have powered a pair of Keystones with a single NU4-6000, channel pairs bridged mono to each 4 ohm sub.
That said, with a three way system, normally I used one channel pair of the NU4-6000 bridged into the sub, and the other two channels for mid/high, the two amplifiers on either side of the stage to reduce cable length.
If one amplifier failed, the system could still be run mono, with one sub per channel, ~3dB less power than in bridged mono mode.
Art
The NX4-6000 is an updated version of the NU4-6000.
I have powered a pair of Keystones with a single NU4-6000, channel pairs bridged mono to each 4 ohm sub.
That said, with a three way system, normally I used one channel pair of the NU4-6000 bridged into the sub, and the other two channels for mid/high, the two amplifiers on either side of the stage to reduce cable length.
If one amplifier failed, the system could still be run mono, with one sub per channel, ~3dB less power than in bridged mono mode.
Art
Would someone mind double checking my math? I'm considering a CVR DSP-654 to run one Keystone (two bridged channels) and one Syntripp.
The DSP-654 can put out 3740W @ 4Ω bridged and 72.1V RMS. The 18SW115-4 in the Keystone takes 3400W max and 1700W RMS, and I see Art recommends limiting RMS to 1/2 of the nominal RMS rating, so 850W.
850W at the speaker's DCR of 5.3Ω gives me 67V which is within the amp's RMS output of 72.1V. Is this sufficient, or should I oversize to something like the DSP-1004 with 2 x 5780W or the DSP-1504 with 2 x 7140W? I'm playing low-crest-factor EDM.
The DSP-654 can put out 3740W @ 4Ω bridged and 72.1V RMS. The 18SW115-4 in the Keystone takes 3400W max and 1700W RMS, and I see Art recommends limiting RMS to 1/2 of the nominal RMS rating, so 850W.
850W at the speaker's DCR of 5.3Ω gives me 67V which is within the amp's RMS output of 72.1V. Is this sufficient, or should I oversize to something like the DSP-1004 with 2 x 5780W or the DSP-1504 with 2 x 7140W? I'm playing low-crest-factor EDM.
The nominal 4Ω 18SW115-4 has a DCR of 3.3Ω, near the minimum impedance of it loaded in the Keystone Sub ~ Fb.
In post #1, I recommended peak limiting of ~3400watts, and long term "RMS" limiting with a time constant of longer than 500 ms (milliseconds) no more than half the 18SW115-4 AES rating of 1700 watts (850 watts), but if you tend to get "heavy handed" on the volume fader playing compressed music over long time periods, just 425 watts.
You are asking about a 18SW115-8, a nominal 8Ω speaker with a DCR of 5.3Ω.
72.1V into the impedance minima is around 981 watts.
~47.5 volts should be safe for low-crest-factor (similar to sine waves..) EDM.
If you want to get the peak performance ~3400 watts, ~134volts peak would be required, compared to ~106v for the 4Ω driver.
Whoops, looking at the wrong specs. I'm using the 18SW115-4. Ok, so for maximum peak performance (most of my music has strong bass hits but not sub-bass sine waves) I should aim for something that puts out at least ~106V, but limit the long-term RMS rating to 425-850W. Does that sound correct?
ACX could work OK, without working with a particular plywood brand hard to say.
"A" and "C" refer only to the front and back plys, "X" denotes the use of an exterior grade adhesive to join the panel’s veneers together.
The knots and other imperfections in "C" grade could be a problem on some pieces like the baffle.
The amount (more is better) and what is in the inner plys is important, avoid plywood where gaps, loose knots and "waves" are visible on the sides.
"A" and "C" refer only to the front and back plys, "X" denotes the use of an exterior grade adhesive to join the panel’s veneers together.
The knots and other imperfections in "C" grade could be a problem on some pieces like the baffle.
The amount (more is better) and what is in the inner plys is important, avoid plywood where gaps, loose knots and "waves" are visible on the sides.
Ended up with four sheets of marine grade, though I'll likely use acx for future builds (my wallet is on fire)
It's void free, but lacks as many plys as birch. The birch was just a little more pricy and only comes in 5x5; which makes the layout more inefficient with more waste.
It's void free, but lacks as many plys as birch. The birch was just a little more pricy and only comes in 5x5; which makes the layout more inefficient with more waste.