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MiniDSP - Page 37

post #1081 of 2293
Quote:
Originally Posted by dwk123 View Post

Quick question on input levels - is it normal for the level display in the UI to be very low with a LFE input? I have the 2x4 balanced and hooking up the unbalanced LFE input from my Sherwood R972 doesn't show any activity on the input monitors that is noticeably different than 'not connected', even with the jumper set to 0.9V - it basically hovers around -72 on the display. Even hooking the unit up to the balanced outputs from my NAD M51 (tested by Stereophile to have 4.7V output on the balanced connection) the input monitors show -40 or so (although that was at the 2V setting). The unbalanced LFE seems to be adequate to drive my existing setup, so if this is just an artifact of the input monitoring I don't want to make too big a deal out of it. I don't really want to have to insert a Clean Box Pro into the system, but it seems that this would solve the problem by converting the single-ended LFE to a pro-level balanced and providing additional gain. Since running with 0.9V input sensitivity and 2.0V output sensitivity should (in theory) provide 6dB gain though, 'logically' it probably shouldn't be needed.
I know the answer is probably 'try it and see', but the hassle of dismantling my current setup to get the minidsp in is high enough that I'd prefer to be as sure as possible before starting.

Sounds about right, I think. Toss a 60Hz signal at max AVR volume (disconnect all speakers/subs) and see what the level does. You don't want the input level to clip.
post #1082 of 2293
Quick question, if I want to use this solely to EQ and crossover my homemade sub in my 7.1 setup, which one of these and what plug in do I want? I want the in box version, not board only. I want to be able to EQ two subs in the future, as my AVR is 7.2.

I am looking for both multi band graphic eq capabilities as well as multiband parametric EQ to eq my sub.

Any advice is appreciated...
post #1083 of 2293
Quote:
Originally Posted by mfrey0118 View Post

Quick question, if I want to use this solely to EQ and crossover my homemade sub in my 7.1 setup, which one of these and what plug in do I want? I want the in box version, not board only. I want to be able to EQ two subs in the future, as my AVR is 7.2.
I am looking for both multi band graphic eq capabilities as well as multiband parametric EQ to eq my sub.
Any advice is appreciated...
I'd suggest the advanced 2-way (that's what I got), but other people might have some other good ideas.
post #1084 of 2293
I agree, the advanced two way.
post #1085 of 2293
Does the MiniDSP work good for EQ'ing the front LCR's in a home theater type setting, or is it mainly for low frequency EQ'ing?
post #1086 of 2293
It works equally well for eq-ing the fronts as it does with subs.
post #1087 of 2293
Yeah the miniDSP looks like a good deal,.
post #1088 of 2293
Pretty close to grabbing a minidsp, going to do a lot more reading first. But have a question that's more user experience.

One of the things I would like to do with my MiniDSP would be to switch my low pass very quickly. Between one setting that would give maximum extension for movies and another that would allow me to really crank the gain for music.

Does the MiniDSP work while connected to a computer? Is there a way to save setups and quickly load one or another?
My plan would be to run a long usb cable from my HTPC to the MiniDSP and leave it connected at all times.

I am thinking a quick macro to load one set of EQs or another.

It would be a very simple start to using it but could be fun.
post #1089 of 2293
Hi Gang,

I read thru miniDSP manual as well as all the treads on AVSforum, but, I could not get clear answer for my questions. Could you please help me. Here is the situation :

1) I have “NAD M15 HD2” Pre-Processor with 2 subwoofer outputs.
2) I have 2 Rhythmic Audio’s Subs connected to subwoofer output of Pre-Pro.
3) I want to install miniDSP 2 x 4 to make necessary adjustment to get good frequency curve.
4) To Measure the frequesncy response of my system I use “Omnimic” with PC, which gives an idea on how the freq. plot looks.
My questions are :

Q1.) Can I use miniDSP as explained above ( connecting SUB out from Pre-Pro ) for making some corrections to the freq dips?

Q2.) Can I use “Omnimic” to find the freq range that needs some boost or cutoff and use that information to input in the miniDSP’s software?

Q3.) If yes, which plug-in do I need.?

Q4.) Can I independently apply the filters ( freq. boost and Q ) for Sub 1 and Sub 2 or is it universal?

Thanks in advance for all your assistance in getting this rolling.

KE
post #1090 of 2293
These are basic questions and the answers should have been readily apparent in the documentation so I expect you just want confirmation of what you deduced from what you read there.

Q1) Yes connect pre/pro outs to MiniD inputs and MiniD outputs to the subs, which I assume are powered

Q2) I believe so. I use REW myself which is free and supposedly can figure out the MiniDSP filter settings needed based on the measurements. I haven't used this myself though so I can't speak as to how well it works in that mode. REW, with the Dayton MIC from PE, is a lot cheaper than omnimic and sufficient if all you want to do is equalize a sub

Q3) Several of the plugins will do the MiniDSP 2x4 ADV is my recommendation. It has 4 outputs. Run a separate one to each sub; you can control 4 this way so you have room to grow. Then configure MiniD so each input controls one of your two subs

Q4) As you can see on the plugin data sheet, there are 5 or 6 (don't recall) PEQ terms on each input that affect all outputs and 5 or 6 more on each output that affect only that output. If you configure it so that each input drives one output, then the PEQs for that input plus the PEQs for that output affect only that one output.

There are other ways to do this. Since you have a pre/pro I expect you also have separate power amps. If so, then you could take the L/R main outputs from your pre pro into the MiniDSP and do the crossover there. then you would take one output on each side from the MiniD to your amp and the other to your sub. This may be a little more challenging to start out with but ultimately you should be able to do a better job of blending the subs with the mains that way.

Before you spend big money, you can download the MiniDSP software and a plugin ($10) and try it out. The interface is intuitive; it should make you feel confident.

Jack
post #1091 of 2293
The miniDSP plug-in can be running on the computer while the miniDSP is operating. You can make changes in real time while its plugged in. You can save and load configurations from disk. There is no macro capability. The plug-in is an Adobe Air application, I don't know how this would work with "macros."
post #1092 of 2293
Quote:
Originally Posted by Theresa View Post

The miniDSP plug-in can be running on the computer while the miniDSP is operating. You can make changes in real time while its plugged in. You can save and load configurations from disk. There is no macro capability. The plug-in is an Adobe Air application, I don't know how this would work with "macros."

Perfect. Thank you.
Edited by Shinyav - 10/23/12 at 11:40am
post #1093 of 2293
Quote:
Originally Posted by JackNC View Post

These are basic questions and the answers should have been readily apparent in the documentation so I expect you just want confirmation of what you deduced from what you read there.
Q1) Yes connect pre/pro outs to MiniD inputs and MiniD outputs to the subs, which I assume are powered
Q2) I believe so. I use REW myself which is free and supposedly can figure out the MiniDSP filter settings needed based on the measurements. I haven't used this myself though so I can't speak as to how well it works in that mode. REW, with the Dayton MIC from PE, is a lot cheaper than omnimic and sufficient if all you want to do is equalize a sub
Q3) Several of the plugins will do the MiniDSP 2x4 ADV is my recommendation. It has 4 outputs. Run a separate one to each sub; you can control 4 this way so you have room to grow. Then configure MiniD so each input controls one of your two subs
Q4) As you can see on the plugin data sheet, there are 5 or 6 (don't recall) PEQ terms on each input that affect all outputs and 5 or 6 more on each output that affect only that output. If you configure it so that each input drives one output, then the PEQs for that input plus the PEQs for that output affect only that one output.
There are other ways to do this. Since you have a pre/pro I expect you also have separate power amps. If so, then you could take the L/R main outputs from your pre pro into the MiniDSP and do the crossover there. then you would take one output on each side from the MiniD to your amp and the other to your sub. This may be a little more challenging to start out with but ultimately you should be able to do a better job of blending the subs with the mains that way.
Before you spend big money, you can download the MiniDSP software and a plugin ($10) and try it out. The interface is intuitive; it should make you feel confident.
Jack

Jack,

Thank You Very much for detailed explanation, really appreciate your help.
If you don't mind, one last question : What is the difference between Rev A & B. ( Other than 0.9 Vrms and 2 Vrms ) . My main concern is what should I buy? ( both subs are powered ).

Thanks again.

KE
post #1094 of 2293
The difference in maximum input level is the only thing I've seen/heard of.
RevA is for up to 0.9Vrms while RevB is for up to 2Vrms input level.

Here is their FAQ. Glad I checked because I had forgottensome of the detail:

In an effort to keep everybody happy, our miniDSP 2x4 kit/box comes with a switchable jumper on the input to adjust the maximum input signal.
◦Version A is meant for consumer line level signal (-10dBV) such as a PC source, Portable media players or any other sources with an output level < 0.9Vrms. The intend of this version is to have high input sensitivity for such low driving sources, hence driving the miniDSP close to the input level ADC like to be (-15dB below headroom).
◦Version B is meant for CD player line level (2Vrms), preamplifiers or any other source with higher output driving capabilities. If you intend to insert your miniDSP kit in line with such source, you better use this version otherwise overdriving of the input converters will result in saturation, aka poor sound quality.


Sounds like RevB is what you want because it can be jumpered either way

◦All miniDSP kit/box are fitted with jumpers that can easily be toggled from revA to revB.
post #1095 of 2293
Jack, thank you very much.
post #1096 of 2293
Quote:
Originally Posted by CrocDoc View Post

Guys,

This is all you will need to power the balanced miniDSP.
http://www.coolerguys.com/840556087977.html

$11 and you can pick up some fans while you are there



On a side note, I got my replacement DSP (balanced) in the mail yesterday, and it is working great! Now I need to send the faulty one back.

Hi,
I will be using unbalanced miniDSP ( http://www.minidsp.com/onlinestore/detail/15-minidsp-in-a-box/flypage/63-minidsp-2x4-revb?sef=hcfp) , can I use this adapter or do I need a different adapter. Since it takes USB, can I use my old iPhones power adapter.?

Thanks.
KE
post #1097 of 2293
Hi,
If i went with Balanced miniDSP, to connect RCA from PrePro to DSP and DSP to Sub, should I be using this connection scheme?

http://www.intelix.com/media/tech_notes/151_Athena_how_to_wire_an_unbalanced_source.pdf

KE
post #1098 of 2293
AFAIK It would work well. I use a balanced miniDSP for my pro-amp and subs. I've often thought, given its connection flexibility, that people can just use the balanced version for both unbalanced and balanced with just the connections being somewhat more complicated.
post #1099 of 2293
Quote:
Originally Posted by Theresa View Post

AFAIK It would work well. I use a balanced miniDSP for my pro-amp and subs. I've often thought, given its connection flexibility, that people can just use the balanced version for both unbalanced and balanced with just the connections being somewhat more complicated.

Theresa,
Thank You.... How about the power unit, what are you using?

KE
post #1100 of 2293
I don't recall. It's from some piece of computer hardware. I just cut the plug off, stripped the wires, checked the polarity with a meter, and attached it.
post #1101 of 2293
Thanks Theresa....
post #1102 of 2293
KE you really shouldn't go with balanced MiniDSP unless you need to connect to pro amps and have to convert to XLR and threfore need higher output levels plus balanced. If your amps have RCA inputs, the unbalanced MiniDSP is cheaper and way more convenient. Its RCA all the way and you can power it by connecting a USB cable to a USB charger (e.g. your old iPhone power adapter)

Jack.
post #1103 of 2293
You are correct.
post #1104 of 2293
Thanks Jack. I went with unbalanced and 4 way advanced plug-in. I have three subs, will try to place per Giddees recommendation ( 3 subs).
I plan to do the following :

1.) Put the 1st Sub at listening position. Using Omnimic, find the best location to house 1st sub.
2.) Move the sub to 1st location based on step #1 and match the "db" to mains ( 75 db ) using the volume control on the amp plate.
3.) With sub #1 playing , walk around the room to locate the best location for Sub #2.
4.) Turn off Sub#1 and match the Sub to "db" to mains ( 75 db )
5.) Turn on Sub #1 and Sub #2, play the track for sweep to find the best location for Sub#3.
6.) Turn off Sub #1 and Sub # 2 and match the "db" to mains.
7.) Turn on all subs and adjust the volume from Pre-processor to match the main, hence, this will be global reduction on all 3 subs.
8.) NOW, bring in the minDSP in the chain. Turn off 2 subs and get the frequency response for 1 sub. Repeat this for all 3 subs.
9.) With three individual FR graphs, turn ON all the subs and measure the FR ( global / all three subs combined ).
10.) This is where the fun begins.... Now play around with the miniDSP to adjust adjust the Freq, Gain and Q for each sub t get as FLAT curve as possible.

Not sure, if this is the most optimum way of achieving the end result or are there better / easy way to do this. Please poke holes in the above procedure so that, I don't spend too much time testing unnecessary parameters.

Once again thanks for all your help.

KE
post #1105 of 2293
How many bands of parametric EQ does the miniDSP offer in the sub-80hz range?
post #1106 of 2293
Quote:
Originally Posted by mfrey0118 View Post

How many bands of parametric EQ does the miniDSP offer in the sub-80hz range?
That's sort of a hard question to answer. At least 12 for a setup consisting of a single input / single output. If you do advanced bi-quad filters you can do more than 12 by using non PEQ sections as PEQs. It also has additional capability for additional channels (input and output).
post #1107 of 2293
Oh, OK I would be very happy with 12. biggrin.gif
Edited by mfrey0118 - 10/28/12 at 6:08am
post #1108 of 2293
if you have Omnimic, the latest software (v4) can be used to figure out the eq. You'll need one of the advanced plugins for minidsp to do it though.
post #1109 of 2293
So as far as measuring FRq Response I'd still have to purchase additional items like a calibration mic correct? Does MINIDSP have its own software or do I need to get that separately as well, yes?
post #1110 of 2293
Quote:
Originally Posted by mfrey0118 View Post

Does MINIDSP have its own software or do I need to get that separately as well, yes?
You would need to buy one of the $10 plugins for it. link
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