or Connect
AVS › AVS Forum › Audio › DIY Speakers and Subs › MiniDSP
New Posts  All Forums:Forum Nav:

MiniDSP - Page 63

post #1861 of 2293
Just visualize the signal chain in your mind. That will help see the necessary connections. Shout out to andy56 and ltd02 for helping me understand all this. Therefore I am able to pass on to you smile.gif
post #1862 of 2293
Yeah, that is expensive. I would probably make my own.

Ok, so that is all i would need then? So i assume i would need 2 of the XLR adapters (to go to the CV) and 1 of the rca adapters (to go to the Yamaha) correct?

I appreciate the time you are talking to answer my questions. I am very much new to this. So your help is greatly appreciated. I am sure the seasoned veterans are tired of answering the same questions all the time. Lol. So you helping out really helps them and obviously myself.
post #1863 of 2293
Yea just pass it on, bookmark links and such. Just make sure and follow that DIY link exactly. The ground jumper is important to avoid white noise. Good luck!
post #1864 of 2293
Thanks, will do. I will probably be back to discuss how to use the software properly and all that. SO I'll be back.
post #1865 of 2293
Quote:
Originally Posted by 04rex View Post

I am glad i am not the only one.

Ok, so if i get it all, i would need the following:

UNbalanced 2x4
Microphone on their site
the software for $10 on their site
REW software
Phoenix connector or adapter to either RCA or XLR cable (i actually have a XLR to RCA adapter right now because of my CV-5000)

Am I missing anything else?

Oh, i think someone asked what subs i am using. I am using 4x Ultimax 15 in their own 3 CU ft sealed enclosures running off of the CV-5000. 2 subs per output on the CV. This is connected to my Yamaha HTR6190 receiver.

Thanks,

The balanced version is the correct one to get, not the unbalanced. As mentioned earlier, the unbalanced one has a problem with inadequate maximum output level to drive the majority of power amps to full output power.

And you need a 12 Volt power supply. Something like this or similar would do:

http://www.parts-express.com/pe/showdetl.cfm?partnumber=120-052

For the software, use the 1x4 advanced plugin.
Edited by andyc56 - 10/22/13 at 10:09am
post #1866 of 2293
So if using a balanced 2 by 4 MiniDsp with advanced plug in, for connections, you would need an RCA male to XLR male from the receiver's RCA sub output to the MiniDsp's XLR input, then a Phoenix male to XLR male, (or 1/4 TRS), from the MiniDsp to the sub amp, in my case the iNuke 3000.

Is that right?
post #1867 of 2293
If anyone has built a case for their balanced 2X4 please share how and what you used.

Im looking at building a box with balanced connectors and so that its Plug and play and all the connectors are on the back... I also need it to fit and look nice in my rack.....

I like the MINidsp box but pics and specs are pretty slim....
post #1868 of 2293
Marty - No, you have to strip the connector from one end of each cable (power, RCA, and xlr) and hard-wire each to the terminals on the MiniDSp. You will also need one 1" piece of wire to continue the balanced signal on the terminals connected to balanced cables. The wires from the RCA were so tiny that I found that I needed to tin the wires to make a good connection. Also I had to remove the minidsp power to constant power because my subs would pop when the 12v trigger turned the amp and minidsp on. hth

Not the best photos, but you can see here...



Edited by d_c - 10/23/13 at 6:48am
post #1869 of 2293
Quote:
Originally Posted by Martycool007 View Post

So if using a balanced 2 by 4 MiniDsp with advanced plug in, for connections, you would need an RCA male to XLR male from the receiver's RCA sub output to the MiniDsp's XLR input, then a Phoenix male to XLR male, (or 1/4 TRS), from the MiniDsp to the sub amp, in my case the iNuke 3000.

Is that right?

Look at that pic. You need RCA or XLR, whatever the sub out is on you processor. That will go to Phoenix connector. The Phoenix connector to whatever, RCA or XLR, is on your sub.
Quote:
Originally Posted by NicksHitachi View Post

If anyone has built a case for their balanced 2X4 please share how and what you used.

Im looking at building a box with balanced connectors and so that its Plug and play and all the connectors are on the back... I also need it to fit and look nice in my rack.....

I like the MINidsp box but pics and specs are pretty slim....

Look up user "Carp". He had a buddy build case. He has an 8x18 SI build. He might share with you
post #1870 of 2293
So if you hard wire the power, input and output cables into the MiniDsp, then why would you need to have a cable with a Phoenix connector?
post #1871 of 2293
Quote:
Originally Posted by Martycool007 View Post

So if you hard wire the power, input and output cables into the MiniDsp, then why would you need to have a cable with a Phoenix connector?

You mean just inserting the wires into the female Phoenix in the unit? Yea you could do that I think. Might just be on some units. I know the Phoenix connectors are diff on the 2x4 opposed to the 10x10.
post #1872 of 2293
Quote:
Originally Posted by NicksHitachi View Post

If anyone has built a case for their balanced 2X4 please share how and what you used.

Im looking at building a box with balanced connectors and so that its Plug and play and all the connectors are on the back... I also need it to fit and look nice in my rack.....

I like the MINidsp box but pics and specs are pretty slim....


For the 2x4 dsp, you would need to check out the posts by ufokillerz.

Beautiful work on his enclosure and he tells you where to source parts and case from.
Case is Takachi HIT23-5-18BB.
Post 311-313 in Gorilla83s Humble Basement Hangout and posts 1628-1632 right here in this thread!
biggrin.gif


edit: he told me part number on case...thanks again, ufo!
Edited by blah450 - 10/24/13 at 2:18pm
post #1873 of 2293
I just ordered the MiniDsp 2 by 4 with Advanced Plug in! I am so excited about getting this setup to EQ my two Marty Subs! I might also play around on it with EQ'ing my Left & Right channels.

With regards to the subwoofers EQ, how can I know where to set the PEQ's to smooth out the responce? I know that I will have to measure and see where the peaks and nulls are at, but once I measure, and determine that there is a peak at "x" frequency, and/or a null at "y" frequency, can that specific frequency be adjusted by the PEQ filters?

What are the purposes of the peak, low shelf and high shelf options? What should be entered for the "frequency" value in the PEQ filter? Also, what about the "gain" & "Q" selections on the PEQ options?

Once I figure that out, I will be able to play around with the different PEQ settings and try to optimize the frequency responce for my duel Marty Subs that will soon be quad Marty Subs! (Note, not sure how long I will get to keep these huge Marty Subs as my soon to be wife might require that I scale down once we move into our new home. LoL!)
post #1874 of 2293
Which model did you get? What kind of amp is powering your subs?
post #1875 of 2293
You can build the filters in REW, from measurements in REW. You need the Phoenix cable to connect to your amp, or 1/4" - whatever balanced cable your amp takes for input. You cut the other end of that cable off and hard wire it into your output terminal of the MiniDSp, like the photos above.
post #1876 of 2293
This is worth while reading to anyone using the 2x4 balanced mini-dsp and pro-audio amp.

http://www.diyaudio.com/forums/minidsp/230470-signal-level-minidsp-x-over.html
post #1877 of 2293
Quote:
Originally Posted by pdxrealtor View Post

This is worth while reading to anyone using the 2x4 balanced mini-dsp and pro-audio amp.

http://www.diyaudio.com/forums/minidsp/230470-signal-level-minidsp-x-over.html

PDX...how do you know the poster was testing a balanced dsp unit? I saw the below...

"5 Vdc supplied through the USB port."...which led me to think it was not. I don't believe the 2x4 balanced kit can be powered by the USB port??

Nonetheless, informative article and I saw this, "The output noise of the miniDSP 2x4 board (Input shorted, open or with 50R across and no signal applied. Output loaded with 10k,) is 15mVpp 2MHz and harmonics."
Might this explain the "white noise" I am getting from my four passive subs despite having no signal fed to DSP?
post #1878 of 2293
Hey folks,

Here is my plan for my dual CHTs 18.2 -- still new in the box:

-Return my iNUKE NU6000DSP(also NIB) for the non DSP version
-purchase the Balanced miniDSP 2x4, mic, and plug-in

This plan will allow me to measure with REW for about $120 more.

I think I just need the 12v power supply, for which I'm sure I can find laying around, and cut this $5.22 cable in half and properly hard wire the mini between my pre/pro and iNUKE:





Since I will be using an old Outlaw pre/pro without room correction, I feel this plan will allow me to measure the entire audio spectrum and have adjustability below 20Hz for the subs.

I believe this is a good plan based on my research and collaboration with another forum member, I just want to see here if there is anything I'm overlooking. I certainly don't want to introduce any noise.

Any comments are welcome.

Shawn
post #1879 of 2293
Quote:
Originally Posted by blah450 View Post

PDX...how do you know the poster was testing a balanced dsp unit? I saw the below...

"5 Vdc supplied through the USB port."...which led me to think it was not. I don't believe the 2x4 balanced kit can be powered by the USB port??

Nonetheless, informative article and I saw this, "The output noise of the miniDSP 2x4 board (Input shorted, open or with 50R across and no signal applied. Output loaded with 10k,) is 15mVpp 2MHz and harmonics."
Might this explain the "white noise" I am getting from my four passive subs despite having no signal fed to DSP?

He mentions in the thread he also gets into measuring the balanced version.
post #1880 of 2293
Quote:
Originally Posted by pdxrealtor View Post

He mentions in the thread he also gets into measuring the balanced version.

Thanks, pdx. Did not see that upon first read-through.

I was hoping that someone in the forum might be able to tell me if the peak-to-peak mV and harmonics part of the tester's data translates to what I have been calling white noise?
post #1881 of 2293
^^^although...white noise is a high frequency thing though, eh....??
post #1882 of 2293
Quote:
Originally Posted by blah450 View Post

^^^although...white noise is a high frequency thing though, eh....??

Im not sure on white noise. Look it ip in wikipedia or the like.

But, if whatever youre hearing only happens w the mini in the chain something is wrong with the mini or a connection. Try contacting minidsp??
post #1883 of 2293
So with regards to the PEQ, what does the frequency, gain, and "Q" setting do? How would I know what to set in these fields? I have read the MiniDsp manual and searched, but I can not find an answer as to what the values in these fields mean?
post #1884 of 2293
The frequency is the area around which the filter is centered, the gain is the amount of boost (cut) that is applied and the Q is the breadth of the stroke (width of the filter). It is easiest to use a program like REW to calculate the needed filters and to send that info to the Mini.
post #1885 of 2293
Something I have never understood is why when targeting a freq is why does boost or cut affect the response above or bellow the target in many cases?
post #1886 of 2293
Quote:
Originally Posted by steve nn View Post

Something I have never understood is why when targeting a freq is why does boost or cut affect the response above or bellow the target in many cases?

You should be able to eliminate that effect with a lower or higher Q. I forget which does what.
post #1887 of 2293
Quote:
Originally Posted by steve nn View Post

Something I have never understood is why when targeting a freq is why does boost or cut affect the response above or bellow the target in many cases?

Here's an example of the response of a parametric EQ when Q is varied. I've chosen the round number of 10 dB for the boost and 100 Hz for the center frequency, and plotted the results from 10 Hz to 1000 Hz on a log scale. I've varied the Q in a 1. 2. 5 sequence as follows:
Q = (0.1, 0.2, 0.5, 1.0, 2.0, 5.0, 10.0)

The smallest value of Q gives the "fattest" curve, while the largest value is the "spikyest". So you can consider Q to be the "spikyness factor". You can see that the boost area is quite "fat" for low values of Q and becomes much narrower for larger Q values.



Notice also that many of these Q values are way too low to be useful for EQ. They are for demonstration purposes only.
Edited by andyc56 - 10/24/13 at 12:01pm
post #1888 of 2293
+1

very good explanation.
post #1889 of 2293
Is there any negatives from a high Q?
post #1890 of 2293
Quote:
Originally Posted by jlpowell84 View Post

Is there any negatives from a high Q?

High Q can cause lengthy ringing in the time domain. Paradoxically though, if your system has a narrow peak in its in-room measured response, cutting that narrow peak with a high-Q PEQ may actually reduce the system ringing at that frequency at the position where the mic was placed for the measurement. Whether it actually does depends on whether the system behaves in a minimum-phase manner around that peak. Minimum phase is a complex subject, and if you want to read more, the REW manual has an intriguing section about it.

In any event, the waterfall feature of REW will detect the ringing if present to a significant degree.
Edited by andyc56 - 10/24/13 at 10:58am
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: DIY Speakers and Subs
AVS › AVS Forum › Audio › DIY Speakers and Subs › MiniDSP