Fender had that exact cab. Not anymore
I would Frankenstein a r100 with that speaker and an amp from a r500!
"Sadly" I only got r100s.
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I would Frankenstein a r100 with that speaker and an amp from a r500!
"Sadly" I only got r100s.
I disagree with RMS being a calculated number. It can be very precisely measured.theese numbers say nothing, cause RMS is a derivated/aggregated/calculated number, and power consumption could mean anything from average to peak.
As for power consumption, my point exactly. It could be "program power", it could be at RMS, it could be instantaneous peak consumption.
TC Electronic quotes "power consumption at 1/8 max power".
800 watt, class D BH800? 200 W.
550 watt, class D BH550? 200 W.
500 watt, class D BH500? 65 W.
Exactly what I said, hence why I put "Class D" in quotes and how I said that unless those are magical integrated circuits with just three terminals, it's not a class D amplifier.
Our group-playing 60s/70s R&R/Country-hasn't had FOH since 2015(IIRC). We provide(d)* our own PA and were our own soundmen. My 200c got to the point of being overkill for most of our gigs, so I use(d)* the 100. It's been plenty at the volumes we were asked to play.
*past tense 'cos it seems we are defunct.
That is bullsh$t talk. Class D needs/has no transistors. If You bought one with'em, it's not Class D. So IDK what the point is here.
Really?
"In electrical engineering
The RMS of an alternating electric current equals the value of constant direct current that would dissipate the same power in a resistive load."
My point was that something can be described as a class D amplifier, but in reality be something completely different — class AB in this case, I presume. But it was just a quick remark, no need to get worked up about it.
As for RMS, it was derived as part of original research concerning AC already centuries ago, but since then, it's well understood and it can be measured. In fact, in absence of any other qualifier, when describing AC voltage, AC current and/or AC power, you talk about RMS. Not momentary, not peak, but RMS.
As for RMS, it was derived as part of original research concerning AC already centuries ago, but since then, it's well understood and it can be measured. In fact, in absence of any other qualifier, when describing AC voltage, AC current and/or AC power, you talk about RMS. Not momentary, not peak, but RMS.
No, nothing but a Class D amp can be described as one...
RMS is a calculated number. You cannot directly measure it! (AC vs DC resistive current...) Please see wikipedia quotation above!
You can measure AC currents then calculate an RMS "value". Most of the time it's measured over time (because AC is nothing but constant in nature), then aggregated:
"So, the RMS value, IRMS, of the function I(t) is the constant current that yields the same power dissipation as the time-averaged power dissipation of the current I(t)."
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I'm not dissing the r100. It's a well engineered amp that does a heckuva lot at it's price point and is very portable to boot. It just doesn't quite fit with my needs. I'd like to see fender do an upgrade as they've already done it with another amp in the line and I think the value for money would be good compared to other amps. You're looking at $1.5k for something like that from other manufacturers which is a bit out of my price range considering I have stuff now that works.Fender had that exact cab. Not anymore
I would Frankenstein a r100 with that speaker and an amp from a r500!
Sigh.
In my electric engineering labs, we used analog AC ammeters/voltmeters and they still measured RMS current/voltage by means of having a very small (or a very great) value resistor over which current/voltage was being measured, ergo, RMS value.
This didn't involve measuring peak, let alone momentary, values and calculating RMS values. Sure, you could do that with an oscilloscope, but if the measured function was not a pure sine and we needed the RMS value for the lab report, we would still turn to the ammeter/voltmeter because it would be impossible to calculate RMS from just the oscilloscope reading.
Sigh, You seem to be arguing over maths and physics without opposing quotation. I'm out!
please note that playing a bass (or any music) is nothing like a pure sinewave...
You can "tivially" (in digital energy meters there is a whole processing unit for it) measure DC decoupled RMS (AC part only) or consumed power over time (like Your energy meter in the house), but that is an aggregate and it is Wh(energy), not Watt(power), which is an aggregate over time, so won't represent peaks at all.
Overall I think we are rumbling over something that's not really relevant in a Rumble forum
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What about the Rumble 800 head (400W into 8 ohms) and a suitable clean transparent neo 1x12 cab?
I have a head/cab now that I'm pretty much happy with. I'm always look for an easier schlep and a combo would be nice.
Guys the output devices of a class D amp is (usually) transistors.That is bullsh$t talk. Class D needs/has no transistors. If You bought one with'em, it's not Class D. So IDK what the point is here.
Really?
"In electrical engineering
The RMS of an alternating electric current equals the value of constant direct current that would dissipate the same power in a resistive load."
Class-D amplifier - Wikipedia
You're right, but they're typically in an integrated circuit because they operate on high frequencies and it would add an unnecessary extra layer of difficulty to PCB design for no gain. The output signal from the IC before the low pass filter is already high frequency, no point in making it even more difficult.Guys the output devices of a class D amp is (usually) transistors.
Class-D amplifier - Wikipedia
en.wikipedia.org
Manufacturers quote RMS power and momentary power.Sigh, You seem to be arguing over maths and physics without opposing quotation. I'm out!
please note that playing a bass (or any music) is nothing like a pure sinewave...
You can "tivially" (in digital energy meters there is a whole processing unit for it) measure DC decoupled RMS (AC part only) or consumed power over time (like Your energy meter in the house), but that is an aggregate and it is Wh(energy), not Watt(power), which is an aggregate over time, so won't represent peaks at all.
Overall I think we are rumbling over something that's not really relevant in a Rumble forum
Then you get to power consumption, and if it's anything but power consumption at RMS power, it's going to be all over the place. "Typical average power over 1 hour" could be 10 W (if energy consumed was 10 Wh) with 500 W peaks because the band was only playing for 20 minutes during that time and the peak was only hit once during an overdriven bass solo, while on a death metal concert it could be 4500 W (4.5 kWh total energy), almost constantly hitting 500 W peaks.
Unless a manufacturer tells us explicitly how they measure power consumption and what class the amplifier is, we're left guessing.
And for what it's worth, Rumble 100 with 100 W RMS power lists "typical" power consumption at 50 watts and 310 watt maximum. If the maximum is twice the RMS power, then power draw at RMS is 155 W, with very modest 65% efficiency. If the maximum power consumption is at RMS output power, then efficiency is an extremely poor 32%.
Moreover, Rumble 40 with 40 W RMS power lists typical power at 45 watts and 110 watt maximum. Deriving efficiency from those figures, we arrive at a more respectable 73% overall efficiency (but barely 36% if maximum power consumption is at RMS output power).
Thing is, none of this hits even close to the frequently stated >90% efficiency for class D amplifiers for the simple reason that power supplies are nowhere near as efficient and really efficient power supplies get really expensive.
The GR Bass AT Cube-350 is 16 lbs. - 350W into a 1x12 with HF driver.
Class AB amps also come as ICs. Nothing special about that.
Those look great but it's just more than I want to spend. I bet an "r250" would cost around $700, considering what the 800 combo costs, about half of what a GR combo goes for.
Right. Transistors are transistors, whether discrete or "integrated" into an IC. Some people think ICs are somehow a different kind if component
I was rocking my Rumble and extension cab last night.
I gots to agree with yer last sentence. Y'all lost me about 12 posts ago.Sigh, You seem to be arguing over maths and physics without opposing quotation. I'm out!
please note that playing a bass (or any music) is nothing like a pure sinewave...
You can "tivially" (in digital energy meters there is a whole processing unit for it) measure DC decoupled RMS (AC part only) or consumed power over time (like Your energy meter in the house), but that is an aggregate and it is Wh(energy), not Watt(power), which is an aggregate over time, so won't represent peaks at all.
Overall I think we are rumbling over something that's not really relevant in a Rumble forum
My take: I turn the amp on; fiddle with the controls as necessary; I like it-or not.
Next.
