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Is the HF hiss gone? 3 weeks 3 days ago #60562

  • hifinewb
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I have a DDRC-24 that has the same HF hiss that many on here have complained about.  Support from MiniDSP is terrible.  I am interested in the FLEX line but do not want to buy another MiniDSP product unless they have fixed this hiss issue.  One review mentioned that noise was gone finally.  I wanted to confirm with people that actually bought (paid for) the product.  Is the HF hiss really gone from the FLEX line of products?

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Last edit: by hifinewb. Reason: correction

Is the HF hiss gone? 3 weeks 3 days ago #60566

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Is it in a car? 
if so you using the minidc ?

Is the hiss only up high in volume…. Some amps don’t like the pseudo balanced isolated rcas…. I am wondering have you tried a GLI? 

i have about 10 minidsp product's now and don’t have hiss….. I have a flex and a ddrc24…. Neither have hiss….. all of my stuff works perfectly…. 

 

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Is the HF hiss gone? 3 weeks 2 days ago #60572

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No, it is not in a car.

The hiss appears at low volume when no music is playing at all.  The DDRC-24's master volume is set to 0.

I don't have the link to the posts at this time but there are several posts on here that just state that this HF hiss is common on MiniDSP products and it is something that most just live with.  But there seems to be some indication that this was remedied in the FLEX line.  

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Is the HF hiss gone? 3 weeks 2 days ago #60574

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Intresting….

my flex is silent as can be , I just went and tested what you said, no noise… nada at all :-) 

again, a pair of ground loop isolators should fix any noise and won’t be detrimental to sound quality…

or , if your any good with engineering, you can match the input and outputs of your amps with some resistors , but if your amp has a gain you should be able to match it , unless it’s highZ type balanced xlr ….

it sounds more like over gained amps…..  you should be able to take the minidsp all the way to the max level without your amps clipping…..

if your max volume is like -25dbfs on your master your gains are too high 

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Is the HF hiss gone? 3 weeks 2 days ago #60575

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I did reduce the Master volume on the DDRC-24 to -12db and it helped a bunch but the hiss is still there when the music is silent, just not as noticeable as it used to be.  But now I have to increase the volume significantly on my preamp just to have the same output volume of course.

I did try the system without the DDRC-24 in the chain and the hiss is 100% for certain coming from the DDRC-24.  No DDRC no hiss.  DDRC in the chain = hiss.  Someone on another post said that it was just in the chips that MiniDSP uses and was unavoidable.  But I have my doubts about that as how could they keep selling more units if that were the case?  How would they ever get repeat customers in that case?

2x4HD / DDRC-24 noise - tweeter hiss . <<< link to a post about the hiss in the 2x4 line.

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Last edit: by hifinewb. Reason: added link

Is the HF hiss gone? 3 weeks 2 days ago #60576

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Preamp? Get rid of that and use the minidsp as a preamp 

or are u talking about amp gain 

are u sure you amp gain isn’t too high?

you should be able to take the minidsp to the max without clipping ….


no hiss without mini ?  Humm 

idk …… maybe a ground loop isolator idk ….

what about a noise gate ? Can you  get one 

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Is the HF hiss gone? 3 weeks 2 days ago #60577

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"Preamp? Get rid of that and use the minidsp as a preamp "  - Tried that hiss still present as long as DDRC is in the chain anywhere.

"are u sure you amp gain isn’t too high?"  - No idea about this at all.  I am new to audio.  But there is no volume control on the amp at all and without the preamp the DDRC controls the volume.

 

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Is the HF hiss gone? 3 weeks 2 days ago #60578

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No amp gain…. How does it match to the impedance of rca ? 

that’s just silly 

I would use ddrc as master or get a flex w a knob 

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Is the HF hiss gone? 3 weeks 2 days ago #60579

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Is the HF hiss gone? 3 weeks 2 days ago #60580

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Input sens to 1.875v 

minidsp is 2v 

it’s a match 

run the minidsp to -1dbfs  to get amp to full power 

no preamp , take that silly thing out. It’s just more signal chain that doesn’t need to be there….. it will sound better without it (unless you like a photocopy of a photocopy and signal degradation from insertion losses. 


i mean , it doesn’t get better then that honestly…. That’s almost unity gain , some would say it is (I would absolutely)
take preamp out 

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Is the HF hiss gone? 3 weeks 2 days ago #60588

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Nice that they are a match.  But when the Master Volume of the DDRC-24 is higher than -12db there is a noticeable hiss from the HF speakers.  That is even without the PreAmp in the chain.

I just wish MiniDSP would actually provide support for their products.  I have tried their email support and got 1 useless reply and then nothing at all after that.  I would like to buy the FLEX but hate to buy from a company that does not support its products at all.

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Is the HF hiss gone? 3 weeks 2 days ago #60590

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If you took the pre-amp out -12db would be so loud that you wouldn’t hear any hiss 


that’s what I’m trying to say! 

use the ddrc as a master volume 
remove the pre amp 

what’s the hiss at -80db? 

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