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Old 16th February 2010, 09:17 AM   #41
minidsp is offline minidsp  Hong Kong
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98% of music data is 44.1.
I think that you may have missed the point I was making about 44.1kHz I2S being for DAC devices, not DSP, so let's move on...

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And again 48dB slopes are also a must
Just happens that we're already working on it as we've already mentioned in many other posts. But let me say it once again. Yes, we are working on it.

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Serious audio equipment should support native sample rates.
Please guys, do your homework before making such radical statements or trying to take our product down, it helps. Basics of the DCX2496 is that converters (ADC/DAC) & DSP IC run at internal 96kHz clock rate (not 44.1kHz). If you can find a DSP that runs its core at an off shoot clock rate like 44.1kHz let me know, i'd be interested to see that. Why: Because It would mean having to reload a different binary code/depending on the digital input sampling rate. So what everybody does (like us) is to include a SRC like the DCX2496 does (check out their spec sheet for more info) for you to be able to get any digital audio source to a generic DSP core. I'd also hope that as a startup that tries hard to please DIYers, spends time answering threads and make a flexible platform, you could either give us a little break before shooting us down or maybe let us prove that we can provide a more DIY oriented solution than a rack mount product from Behringer. Anyway, can we close that issue of 44.1kHz once & for all? Didn't I say earlier on that we would release a 44.1kHz plug-in?

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I do understand that going the x*48khz route is the more easy way for you guys at the current stage
Not really actually, 48kHz multiples just happens to be the standard for most DSP audio platform sampling rate for many years now. We didn't invent anything... :-)

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. Using a PC as DSP (at 64bit!) would be by far more efficient in most cases.
Alright, let's summarize what we're building here: A low cost, low power board, that runs low latency digital signal processing for flexible configurations. Trying to get the same flexibility, latency on a PC isn't going to be as easy as it sounds. Trying to fit your PC inside your DIY amp/DIY preamp, DIY active loudspeaker isn't going to be as easy either.. :-)

Alright, I'll stop here. I do understand you're trying to get constructive, but I think that your technical knowledge on DSP might need to fill some gaps. As said in other post, we're always happy to educate, but please don't try to patronize us too much with radical statements on a field (digital audio/digital processing) where we do know what we're talking about. You'll get much better results at maybe asking few things you may not know about DSP... :-)

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miniDSP DevTeam
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Old 16th February 2010, 09:27 AM   #42
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Originally Posted by soundcheck View Post
Price is 200 over here
= $272 USD at todays rate (plus what it costs to make it usable/tolerable )

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Old 17th February 2010, 06:01 AM   #43
Mach5 is offline Mach5  United States
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Since this product is intended for DIY

How would one go about hooking things like Clip meters, RMS meters or remote volume controls, stereo/mono mode?

Feature requests:
external program select(extra bass mode, external sub mode, any user preset) would be useful for DIY active speakers
Rectifier on DC input to make stupid proof. After all, we're not professionals

Last edited by Mach5; 17th February 2010 at 06:14 AM.
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Old 17th February 2010, 10:39 AM   #44
minidsp is offline minidsp  Hong Kong
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Quote:
Originally Posted by Mach5 View Post
Since this product is intended for DIY

How would one go about hooking things like Clip meters, RMS meters or remote volume controls, stereo/mono mode?

Feature requests:
external program select(extra bass mode, external sub mode, any user preset) would be useful for DIY active speakers
Rectifier on DC input to make stupid proof. After all, we're not professionals
Remote volume controls for master volume is currently the only supported feature. Other things like displaying RMS meters for each channel would require quite a bit more I/O so it will need another board. We have ideas, but nothing concrete at this point. All these controls being software based at this point.

External program selection is indeed a very good idea which we've been toying around, but building presets (i.e. saving in memory many settings, if not all) requires some redesign of our current micro controller firmware.
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Old 17th February 2010, 11:09 AM   #45
Shaun is offline Shaun  South Africa
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Originally Posted by minidsp View Post
Remote volume controls for master volume is currently the only supported feature.
Sounds like something I need. Could you explain its functionality, just for clarification? What I need is to be able to control the volume of DSP crossovers situated in separate active loudspeakers from a single point. Is that what this is?
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Old 18th February 2010, 10:11 AM   #46
minidsp is offline minidsp  Hong Kong
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Shaun,

I may have to clarify that "remote control" is actually not "IR remote control". By volume control, I meant the fact that you could connect a potentiometer on the miniDSP kit to control the master output of that kit.

If you have multiple kits to control and want to have a single pot, just tie the pot pins together to a single potentiometer. Tricky/Smart diyers may realize that they could do the same with a DAC/PWM+LP, an IR receiver and a simple ATMEGA/AVR code to control the voltage (0 to 5V) remotely via an IR remote this time.

Question: Wouldn't controlling the level at the input source(pre-crossover) achieve the same feature for you?

Anyway, hope this clarifies, and let me know if you have further questions.

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Old 18th February 2010, 01:32 PM   #47
Shaun is offline Shaun  South Africa
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Originally Posted by minidsp View Post
Question: Wouldn't controlling the level at the input source(pre-crossover) achieve the same feature for you?
Yes and no. And dunno.

Yes: it will work.

No: I think, basically, it seems desirable to keep the signal at the highest amplitude in the digital domain, so as to take maximum advantage of the available dynamic range, and in an effort to avoid loss of low level detail. So, logically, the volume control should be after the DSP section.

Dunno: I don't really know how much this matters (seems to satisfy those who use the Behringer DCX2496 crossover). Perhaps you can enlighten me otherwise?
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Old 18th February 2010, 04:43 PM   #48
tinitus is offline tinitus  Europe
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Originally Posted by Shaun View Post
Dunno: I don't really know how much this matters (seems to satisfy those who use the Behringer DCX2496 crossover). Perhaps you can enlighten me otherwise?
With regards to Behringer, are not certain issues related to that specific product
Maybe something about noise and overload, that some people try to deal with in a certain way of placing attenuation
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Old 18th February 2010, 06:16 PM   #49
Shaun is offline Shaun  South Africa
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Originally Posted by tinitus View Post
With regards to Behringer, are not certain issues related to that specific product
Maybe something about noise and overload, that some people try to deal with in a certain way of placing attenuation
I speak under correction, but I got the impression that it had to do with the effects of attenuating (i.e., volume control) before the DCX input vs. after the analoguye outputs. Overload may be yet another problem, but I have not paid attention to that (I don't own a DCX2496).
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Old 18th February 2010, 10:28 PM   #50
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From what i can tell this is a very cool board, happy i stumbled across this thread. Would appreciate if you could answer a few questions that come to mind:

1) You mentioned in an earlier post "use our SPDIF I/O card with Sample Rate Converter embedded to get the I2S to 48khz" - does this card already exist or it is forthcoming?

2) Website mentions Room Correction plugin. I assume this is also forthcoming. Could you tell me if it will be possible to run two plugins at once? For example Room Correction + 4 way digital crossover at the same time? This seems like a reasonable combo. I assume there will be a microphone input?

3) For the time being would it be possible for me to use a DEQ2496 for room correction (maybe upsampling) and digitally input this to the miniDSP for crossover duties, taking analogue outs from the miniDSP into the amps? (for an active speaker setup).

For what it's worth, i think the prospect of building the miniDSP into a speaker cabinet having a single digital input is far more attractive than having an external DCX2496 with a bunch of analogue cables. On that basis i find this an inspiring product, at least when a little more of the H/W interface + plugins come out. Nice work.
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