What further enhances this confusion is The fact that The BRANDS THEMSELVES states they are using "digital poweramps" like Markbass and many others, this doesnt make any sense does it?
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New mesa subway amps and cabs!
- Thread starter mexicant
- Start date
- Feb 12, 2006
- 61,038
- 5
- 220,968
- Disclosures
- Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
Correct, class D does not stand for digital.
Which means both amp-manufacturers and Music-shops needs too stop advertising: only blablabla kilograms due too "digital power amp" I mean sure you got a few amps like TC and the new modeled Rumbles which actually implement digital technology, but almost everyone everywere talk about class d as digital :O
example 1: https://www.google.no/url?sa=t&rct=...-Amp-Head.gc&usg=AOvVaw39OtszpMXiu_1FQDJKUTIV
"Get ample power out of your head. With an 800W digital power amp driving this beast, the MarkbassLittle Mark 800 bass amp head will satisfy......"
"Get ample power out of your head. With an 800W digital power amp driving this beast, the MarkbassLittle Mark 800 bass amp head will satisfy......"
OK. I may have used the term, Data Stream incorrectly. But the way I see it, is that data in a digital system is represented by one of two logic states sometimes referred to as ones and zeros. Light on, light off... High Voltage, Low Voltage, Frequency A, Frequency B. Phase A, Phase B. Position in a quadrature constellation. Red, Blue. Wax on, Wax off. Choose your poison.
What I was trying to say when I answered the question was that TV (and digital radio) transmitter carriers are not keyed on and off in relation to the logic states of the data fed to those transmitters. Nor is there a big amplifier that takes in digital audio and video and simply increases it at the transmitter for broadcast over the air. Which is the question I believe I was asked. Perhaps this response answers the question better than I did originally. If that is the case, then thank you for your comment.
All of those One and Zero logic states that I described are analog in nature. The level, phase, color, frequency, representing a particular instantaneous state is analog. If it falls within the standard range needed to represent a logic state at that point in time then everything works. If it doesn't then things fall apart. Jitter is an issue in digital communications because it tends to affect how the logic state is decoded. It shifts the logic state in relation to time and shift far enough it becomes ambiguous.
The component of the logic state is affected by jitter because that logic state is determined by an analog value. If Blue represents a logic one and Red represents a logic zero, there is a range of blue and red used for those representations. If the logic state is purple you have too much "jitter" and it won't be decoded properly. Blue can be a range of blue shades and represent a logic one, but if it deviates beyond that range then it won't be a logic one, and it won't be a zero either. The data point is not blue, and you have a problem. Digital data is dependent on the analog components, that make up the instantaneous logic state, remaining withing a certain range of the analog feature, whatever it may be. But you know that already.
A TV (or radio) transmitter is an analog device that transmits an analog radio frequency signal that conveys information by modulation schemes that can be decoded by a "digital" receiver.
Last edited:
- Feb 12, 2006
- 61,038
- 5
- 220,968
- Disclosures
- Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
Analog FM or the old analog TV standard wet truly analog. Digital OTA or Digital Radio transmit an encoded, compressed digital signal over frequency modulation. But since they’re encoded, that can use a smaller amount of bandwidth which is why you can get the .2 .3, etc channels on a digital broadcast.
It's not the encoding - that's just 'how' the digital signal is transmitted thru the air or over the cable. It's the data compression that allows multiple sub-channels in a digital TV broadcast. Analogous to WAV vs mp3 in audio. All of the digital TV signals are subjected to these data-compression algorithms before transmission, so a representation of a higher bandwidth signal can be sent down a lower bandwidth medium. Down a smaller pipe, so to speak. TV stations are still only allocated the same amount of frequency space as when they were transmitting analog, std def TV. Data compression allows them to squash the hi-def signals to fit in the same frequency space, for better or worse.
Uncompressed HD video, say the program output of a sports remote truck, for example, has a data rate of up to 1.5 Gigabits/sec. No transmission medium currently has this data rate capability. This signal is data-compressed multiple times before it gets to the home, often ending up at around 12 - 16 megabits (on a good day) when it gets there. Over the air TV broadcast is typically constrained to approx. 19 megabit data rate on a channel, so the stations/networks often re-compress the channel data streams in order to fit more sub-channels into that space. That's throwing a lot of data away...
Sorry, now back to your regularly scheduled programming - I'm probably ordering a Subway 212 next week to go w my D800, pending permission from the SO. Merry Xmas to me!
Uncompressed HD video, say the program output of a sports remote truck, for example, has a data rate of up to 1.5 Gigabits/sec. No transmission medium currently has this data rate capability. This signal is data-compressed multiple times before it gets to the home, often ending up at around 12 - 16 megabits (on a good day) when it gets there. Over the air TV broadcast is typically constrained to approx. 19 megabit data rate on a channel, so the stations/networks often re-compress the channel data streams in order to fit more sub-channels into that space. That's throwing a lot of data away...
Sorry, now back to your regularly scheduled programming - I'm probably ordering a Subway 212 next week to go w my D800, pending permission from the SO. Merry Xmas to me!
Thanks to Chef, it has a little more high end transparency than the original Walkabout. We have heard a few players wish for a little more, Chef was the most persuasive
Well alright, way to go! @Chef
Just curious (I haven't read the whole thread yet), but why the need for USB-C?
USB 1 was adequate for 4 channels of 24bit audio, at up to 48kHz.
As far as I understand, a simple converter cable will interface an old USB device, with USB-C.
- Feb 12, 2006
- 61,038
- 5
- 220,968
- Disclosures
- Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
This is where reading the manual would be helpful... it does not transmit or receive any data. It is a USB-A style connector which is the standard for a power source/hub.
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USB DEVICE POWER: This connector provides power to USB devices that might be used in conjunction with practicing, recording, jamming or even performing. It may also be used to recharge phones, MP-3 players, iPods, and any number of devices. This port follows the PC USB 2.0 standard, rated current is 500mA maximum, and conforms to the Apple USB charge current standard. While this charge port will work with most devices, there are some that do not conform to any current demand/limit standards or must be operated from a high current (or proprietary) USB charge port only. These devices will either charge more slowly or possibly not at all. Due to the lack of uniformity in the market following standards, and continual evolution/changing of the standards, this port is offered as a convenience only.
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No need whatsoever, just that connectors tend to become antiquated like a serial connector on a laptop. It’s great to have a backup charger or maybe a hot chick wants to charge her phone. Bow chicka bow, I got you covered. Heh.
- Feb 12, 2006
- 61,038
- 5
- 220,968
- Disclosures
- Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
There may be confusion between two different standards, one standard is for connectors and the other standard is for the data/power protocol. USB-A is a connector standard for example.
Cool, that makes a lot more sense.
I got the impression, from the other post, that maybe it had a built in audio interface, which I can see would be useful / desirable to some people recording on a mobile device - but personally I'd go with the D.I. and a Mic, or two.
True, but my point (back when I had the wrong end of the stick, with regards to the USB ports purpose, on the amp) was that when USB 1 was adequate for recording 2 channels of audio, whilst simultaneously monitoring 2 channels, the devices had USB-A connectors.
From that point of view, it wasn't an issue that your new amp didn't have USB-C connection, as the old format was more than capable of the amount of data throughput required, and a conversion cable would ensure it was future proof with regards to interfacing with newer computers / devices.
The latter is still true, though as you have kindly pointed out, the USB port is just a power supply - not part of an audio interface.
Cheers!
