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miniDSP Low cost, modular Digital Signal Processor (DSP) kits for the DIYer from miniDSP.

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Old 10th February 2011, 03:13 AM   #11
minidsp is offline minidsp  Hong Kong
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REW stands for Room EQ Wizard. A free measurement and tuning software provided online for free. Type REW on google for more info. The advantage being the ability to let REW calculate EQ settings for you (autoEQ mode) or tune EQ/filter settings and export them to miniDSP.

There is an app note that will give you a lot more information on our website. MiniDSP - Auto-EQ tuning with REW

Hope this clarifies.
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Old 10th February 2011, 03:29 AM   #12
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Thank You for the excellent tutorials. Very timely, and eagerly look forward to part 2 & 3.
Keep up the good work.
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Old 20th February 2011, 02:23 PM   #13
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Is it possible to use one dsp per channel with 4 way horn set up. I am concerned about power supply based separation issues of these units. Off board dacs might be another option. I had in mind a preamp using these(the balanced version for higher output) battery powered to use with PC based home theater (channel) Austar is bleeding me dry$$$. I think I can find as much content on free to air and internet these days
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Old 20th February 2011, 04:20 PM   #14
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Hi Fatbattery,
I thought we were the only ones with a similar problem. . (Austar, Bell).
one DSP per speaker should work. I thought horns were full range.?

Last edited by keyboard123; 20th February 2011 at 04:24 PM.
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Old 22nd February 2011, 08:39 AM   #15
minidsp is offline minidsp  Hong Kong
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@ Fatbattery,

As already answered by keyboad123, one miniDSP kit/2x4 will indeed be required to provide processing power for each 4way speaker. In total 2 miniDSP kit for a stereo configuration.

miniDSP been running on batteries fine on other designs from our community members.

Hope this info helps,
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Old 23rd February 2011, 10:27 AM   #16
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Are horns fullrange huh? are what I am referring to is using one dsp per channel left right rather then frequency channel Sorry if I wasn't clear on that. I am worried about the lack of separation these little dsp's may have. So digitally you have to split the left right Chanel's. I don't think that will happen hey? I realize you can daisy chain them up for as many frequency channels as you want. Anyway how is the sound quality? Are they as good as say better then a ipod even after you mess with the time domain's. I could live with them I think if they where as good as a ipod. I am not saying a ipod is supa but that would be my minimum hopes. I think having the freedom to do what they can do would make up for there short comings Fidelity wise then. I will always keep a passive system to compare. Just poor seperation really bugs me. And modern dual op amps seem to suffer that problem.
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Old 23rd February 2011, 05:38 PM   #17
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Hi Fatbattery,
The way i would use the DSp is one per channel. So if one channel (say left)of a stereo signal is fed into it. then if say your speaker box has four speakers in it the signal is split up to the frequencies you would want to send to each via a dedicated amp for each one. Mine is not up and running yet, but users seem to say its very good.

Maybe miniDSP can give you more info , on what youre' looking for.
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Old 24th February 2011, 03:27 AM   #18
minidsp is offline minidsp  Hong Kong
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In answer to your questions, I think that what you're referring to is the so called "crosstalk" between channels. In a miniDSP solution, you'll be looking at -82dB crosstalk which is already good. A signal that is -82dB is already very close to the noise floor of most products and I really doubt that it would become an issue (at least we've never heard anybody commenting/complaining about that... )

Remember that at the source (i.e. the mix by the engineer of the CD/DVD), they would indeed do some natural crosstalk of the signal to get your stereo signal to sound center stage so it will add another challenge to be able to notice that crosstalk..

Would it sound better than a passive system? I'm not sure how easy that comparison is... i.e. In the DSP world, the flexibility you will have in terms of tuning (filter/PEQ/time alignment) is just no match for a passive filter. Unless you have many months of free time to constantly change your passive filters to tune them manually... DSP processing brings up to the table ease of use where you can focus on tuning your speaker rather than changing caps and resistors.. Things like time alignment would matter a lot in our way of tuning. DSP is just a different angle to speaker design I think, hence no direct comparison possible to my mind.

Finally, note that none of our users ever used a single miniDSP per channel to prevent crosstalk, although a lot of them are doing some high end implementation... But with this said, that doesn't mean much since audio is so subjective... :-)

Hoping this info helps.
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Old 24th February 2011, 04:42 AM   #19
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Yea thats fine. I did not clarify either that I will be using only digital in. I want to take the digital out of my austar and PC . If the separation is OK I wont worry about it too much. I would disagree with you on the issue of separation being hard to hear. Its very easy. I love lots of stage width. Thanks for all your help folks.

When I set up my dsp I will report back with my results. I have been wanting to go digital active for years. And pretty much from what I have read the Beringer crossover was about the only budget solution. And most that used it where never happy with it so I stayed passive.

I think this product is a massive break through for the audio diyers. An absolute bargain when you consider how expensive and damaging just one inductor in the speaker path can be. It's why I have always until now stuck with full range. Even the most efficient speakers loose all there dynamics and life when a inductor is inserted between them and a low damping factor SE amp. Massively expensive large Low DCR CCcore inductors being the only half solution to the problem. I look forward to setting it up. Thanks again!
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Old 27th February 2011, 06:34 PM   #20
theresa is offline theresa  United States
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Quote:
Originally Posted by Scrappydoo View Post
Hi,
I just bought the mindsp for my OB speakers, I only need a 2 way setup what would be the best plugin to buy?
The 2way xover advanced looks like it to me.
Thanks.
Exactly, the 2 way xover advanced. I use two miniDSPs running that software, one for R/L, the other C with the left over for the subs which are partially crossed over by the UMC-1.
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