agedhorse

Even if the information is not yours to share?

Not quite, unless I read it wrong...

Almost. The power of a square wave is equal to the RMS power of a sine wave and 1/2 the power (.707 x the voltage) of the peak power of a sine wave. Peak power is defined for a sine wave at 2x the RMS power, and when Trace advertised 500 watts peak power, that's exactly the same as 250 watts RMS. It has nothing to do with burst power (which has an entirely different definition and applied primarily to broad band signals). Power RMS is equivalent to the area under the voltage curve x the current curve, and when integrated over time becomes energy.

Yes, for the most part that is incorrect. There may be a trivial difference at very low frequencies due to filter cap time recharge constants, but it will be less than 1/2dB at 30Hz on a properly designed amp and often much better. Note that meters can be inaccurate at very low frequencies, which why special meters are used for broad band audio measurements.

Not necessarily. I'm still measuring the same way today as I did in the 1970's and every product I have designed uses power based on RMS metrics and states THD. For MI applications, especially where the distortion harmonics components may be integrated into the signal in both the preamp and power amp, I have standardized on 10% because after a lot of test player contributed their perceptions, 10% was pretty much the sweet spot where most players liked both the tone and texture. The most common numbers I see for bass amps range from about 5% to 20%, depending on the application. For guitar amps intended to be overdriven as part of their native tone, 10% to 30% is more common. Of course, the amps must be tested and safety certified under these conditions if being honest. For pro audio, the numbers are different of course, and as powers increase the duty cycle factors into the equation. This is most common at very high powered pro audio amps, where after a second or two, the limiting algorithms fold the power back to about 1/2 the rated power and in big powered speakers, the HPF may shift upwards and the crossover points may also shift along with the limiting thresholds. This was all started with Meyer, Renkus Heinz, Apogee and later with JBL, etc. This has allowed maximum performance with minimum damage and warranty claims.

or lost...

Agreed, a false sense of security

Actually, the damage to the older gear tended to be more catastrophic if it falls the same way. Broken parts, bent sheet metal and such is not uncommon when an amp takes a fall, usually the lighter weight gear is easier to repair in that regard. It used to be common for a fall to break the transformer mounting screw(s), causing the transformer to cause collateral damage to whatever initially survived.

Why not a simple splitter Y cable?

Steve1250 - If you are still having issues with your D-800, message me and I will help you get it sorted out. Be sure to let me know where you are located so I get you accurate info.

Or how many (because one is never enough) 😄

Why can a 50W guitar amp sound as loud as a 500 watt bass amp (into appropriate speakers)? 1. Hearing is much more sensitive at guitar frequencies than bass frequencies 2. Guitar speakers are generally significantly more sensitive at guitar frequencies, than bass speakers are at bass frequencies, often by a factor of 10dB 3. Guitar amps are often driven into distortion, which increases the effective compression and average power density. 4. Guitar speakers tend to beam more because of the frequencies (including harmonics) that they are reproducing, this increases the on-axis volume.

Not by industry convention you aren’t.

Understood, though the assumption that Behringer and TC are using similar power modules (actually, the power amp and power supply are an integral part of the main board) isn't accurate. The power supplies/power amps are very different, though they both share a similar ambiguity (creativity) with regards to the way they rate their output power. I was referring specifically to those who quote power off of a power module data sheet, without understanding the depths of what they are looking at. There is a ton of critical data between the lines of the data sheet, in fact that's what my US patent is based on with regards to some specific technology applications with a couple of lines of older ICEPower parts. We received this patent while working with directly the ICEPower engineering team on some of these off-sheet attributes, and these basic concepts got incorporated into the newer series power modules. This is what allowed us (Genz Benz) to do what everybody said could not be done, and we did it with higher reliability than those who used the modules within the limitations of the data sheets too. All Shuttle, ShuttleMax and Streamliner amps use various portions of that patented technology, them the patent was acquired by Fender and was theirs to use as well.

Your understandings and conclusions based on how you are reading the specs from the data sheets is flawed.

Don’t go poking around creating new problems. Surrey Amps is fully qualified to service your amp correctly, I can work with them directly to solve the problem. If you create new problems, the cost is sure to go up,

Both of these are possibilities, not terribly common but possible.

Solid state amps don’t have to sound nasty beyond 1% THD, those that do haven’t designed around this parameter. Some tube amps clip very similarly to some solid state amps. Some us different than all.

Is the amp quiet without the pedalboard, bass straight into the amp? Where are you located? What is your power source? there is also a possibility that there is a ground loop between the amp and pedalboard, or even a single pedal on the board.

You just might be misunderstanding how power amps are rated and specified however, therefore your generalization inaccuracy.

If the amp is quiet with nothing plugged into the input, this means that the interference signal is entering from the bass or wiring. Now, when it's quiet using humbuckers but noisy using single coil (or split coil), this confirms that the noise is environmental and is entering the bass through the pickups. In humbucking mode, this cancels common mode environmental noise, which is working as it should. The same thing applies to the Nordstrand pickups, which allow you to sweep between single coil and hum bucking, and the noise nulls out when fully humbucking. Also, the noise profile is mostly 50 (or 60Hz) with very little second or third harmonics which also indicates that the noise is radiated from the power source and is unrelated to the amp's power supply. I bet the noise changes with your position in the room, or just turning it around a bit? Things that cause this include an amp with a noisy line frequency (lead sled) transformer that has a loose radiated electro-magentic field, large motors, some lighting, and some old school fans. There is a slight possibility that the noise is due to circulating currents in your power ground/earthing system, but unlikely since the amp would usually have some noise with nothing plugged into it.

Except that this is not true for well designed amps, class D or otherwise.

IEM rigs work great for some players, doesn’t work at all for many players. It depends very much on the particular application and situation. I don’t like it where a player denigrates another player’s choices based on only their particular choice, even if that choice may not reflect the other player’s needs or situation.

Other ware some models that used the same module operated at 8 ohms with lower rated power. Much of the emulation/simulation involves significant dynamics processing which limits the power into their respective rated loads. Otherwise those poor speakers would fail at an unacceptable rate. It’s a combination of both approaches depending on the specific product. Active power management while maintaining musicality is a game changer. I remember when such adaptive algorithms (including dynamic HPF’s, adaptive multi-band compressors/limiters, dynamic crossover points, HF lift circuits (came into existence in the pro audio world in products like Meyer, Renkus Heinz, Appogee, etc), they are now ubiquitous in today’s pro audio products at all levels. That’s one reason why reliability has dramatically improved.

A quality power amp designed for 2 ohm operation should have no problem driving 2 ohm loads with no reliability issues, I have been doing so for >30 years.