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Old 08-04-2015, 05:58 PM
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Quote:
Originally Posted by ellisr63 View Post
No pics... it is behind my rack mounted on the wall. I am going to try attenuators, and if that doesn't solve it i am going to ask for a refund and buy a active crossover (maybe an Ashley).
My dad just ditched his Ashley x-over and went with a 2x8 MiniDSP and loves it, no hiss no issues at all.

It really sounds like you have a ground loop. Are you able to log in and turn down your input & or output gains ?
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Old 08-04-2015, 06:02 PM
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Quote:
Originally Posted by dashpuppy View Post
My dad just ditched his Ashley x-over and went with a 2x8 MiniDSP and loves it, no hiss no issues at all.

It really sounds like you have a ground loop. Are you able to log in and turn down your input & or output gains ?
I have tried muting the inputs, and the outputs and it makes no difference. This is a high frequency noise like old FM radio static (before they muted between the stations). All the ground loops I have ever heard were alway a hum...nothing like what I have now.

Krell Showcase 7.1, (3) JBL 2360As/EV DHA-1s, (3) 1/4 Pie bass bins, Xilica XP-4080 crossover, (2pr) JBL 8340As,  (1pr) JBL 8320s, PS3, XBox360, (2) Intel NUCs, Blue Jeans 7.1 Cables, Redmere HDMI cables, Monster HTPS7000, 2 DTS-10 subs, Panasonic AE8000, SeymourAV 180 (195" diagonal) scope screen, Darbee Darcet, (1) Yamaha P7000s, (1) Yamaha MX-A5000, MiniDSP DDRC-88A, and an Oppo 103.
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Old 08-04-2015, 06:09 PM
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Quote:
Originally Posted by ellisr63 View Post
I have tried muting the inputs, and the outputs and it makes no difference. This is a high frequency noise like old FM radio static (before they muted between the stations). All the ground loops I have ever heard were alway a hum...nothing like what I have now.
I know what you are hearing i had the same thing. I removed my usb and used a good PSU and mine all went away.
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Old 08-04-2015, 06:17 PM
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Originally Posted by dashpuppy View Post
I know what you are hearing i had the same thing. I removed my usb and used a good PSU and mine all went away.
So you are saying i need to buy 3 new power supplies? The USB cable is only plugged in when I am programming the boxes.

Krell Showcase 7.1, (3) JBL 2360As/EV DHA-1s, (3) 1/4 Pie bass bins, Xilica XP-4080 crossover, (2pr) JBL 8340As,  (1pr) JBL 8320s, PS3, XBox360, (2) Intel NUCs, Blue Jeans 7.1 Cables, Redmere HDMI cables, Monster HTPS7000, 2 DTS-10 subs, Panasonic AE8000, SeymourAV 180 (195" diagonal) scope screen, Darbee Darcet, (1) Yamaha P7000s, (1) Yamaha MX-A5000, MiniDSP DDRC-88A, and an Oppo 103.
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Old 08-04-2015, 06:36 PM
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Quote:
Originally Posted by ellisr63 View Post

I have tried muting the inputs, and the outputs and it makes no difference. This is a high frequency noise like old FM radio static (before they muted between the stations). All the ground loops I have ever heard were alway a hum...nothing like what I have now.
What about the cables that are used as outputs from the MinDSP? Granted its a balanced setup but only if the cables are in good shape.
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Old 08-04-2015, 08:59 PM
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Quote:
Originally Posted by dashpuppy View Post
I know what you are hearing i had the same thing. I removed my usb and used a good PSU and mine all went away.
So you are saying i need to buy 3 new power supplies? The USB cable is only plugged in when I am programming the boxes.

Krell Showcase 7.1, (3) JBL 2360As/EV DHA-1s, (3) 1/4 Pie bass bins, Xilica XP-4080 crossover, (2pr) JBL 8340As,  (1pr) JBL 8320s, PS3, XBox360, (2) Intel NUCs, Blue Jeans 7.1 Cables, Redmere HDMI cables, Monster HTPS7000, 2 DTS-10 subs, Panasonic AE8000, SeymourAV 180 (195" diagonal) scope screen, Darbee Darcet, (1) Yamaha P7000s, (1) Yamaha MX-A5000, MiniDSP DDRC-88A, and an Oppo 103.
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Old 08-04-2015, 09:05 PM
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Quote:
Originally Posted by ellisr63 View Post
So you are saying i need to buy 3 new power supplies? The USB cable is only plugged in when I am programming the boxes.
are you saying you are using one power supply for all 3 ?

If so there is your ground loop. try using just a regular 12V battery OR use a walwart power adapter of 12V output, they are dime a dozen.

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Old 08-04-2015, 09:11 PM
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Quote:
Originally Posted by dashpuppy View Post
are you saying you are using one power supply for all 3 ?

If so there is your ground loop. try using just a regular 12V battery OR use a walwart power adapter of 12V output, they are dime a dozen.
I think we are going down a rabbit hole. Ellis said he purchased the MiniDSP power supplies (I am assuming three), so I doubt this is the cause of the problem.
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Old 08-04-2015, 09:16 PM
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Originally Posted by AustinJerry View Post
I think we are going down a rabbit hole. Ellis said he purchased the MiniDSP power supplies (I am assuming three), so I doubt this is the cause of the problem.
Correct.

I just got an email from MiniDSP regarding this. They are saying that the DDRC-88A is sending 8v to the miniDSP 2x4 which can only take 4v (which is interesting since my jumpers show a max of 2v). They said to switch the output to unbalanced to lower the output, and lower the noise floor. They are agreeing that it is because my horns are so efficient. They also said that the balanced outputs were designed for Pro amps, hence the higher voltage output. I am going to try some attenuators this week to see if it solves the problem (I hope it does because I really like the product).

Krell Showcase 7.1, (3) JBL 2360As/EV DHA-1s, (3) 1/4 Pie bass bins, Xilica XP-4080 crossover, (2pr) JBL 8340As,  (1pr) JBL 8320s, PS3, XBox360, (2) Intel NUCs, Blue Jeans 7.1 Cables, Redmere HDMI cables, Monster HTPS7000, 2 DTS-10 subs, Panasonic AE8000, SeymourAV 180 (195" diagonal) scope screen, Darbee Darcet, (1) Yamaha P7000s, (1) Yamaha MX-A5000, MiniDSP DDRC-88A, and an Oppo 103.
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Old 08-04-2015, 09:41 PM
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Quote:
Originally Posted by ellisr63 View Post
Correct.

I just got an email from MiniDSP regarding this. They are saying that the DDRC-88A is sending 8v to the miniDSP 2x4 which can only take 4v (which is interesting since my jumpers show a max of 2v). They said to switch the output to unbalanced to lower the output, and lower the noise floor. They are agreeing that it is because my horns are so efficient. They also said that the balanced outputs were designed for Pro amps, hence the higher voltage output. I am going to try some attenuators this week to see if it solves the problem (I hope it does because I really like the product).
Can we assume you will try the MiniDSP Support recommendation before trying attenuators? Remember, it is always good practice to only make one change at a time.
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Old 08-05-2015, 08:53 AM
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Originally Posted by AustinJerry View Post
Can we assume you will try the MiniDSP Support recommendation before trying attenuators? Remember, it is always good practice to only make one change at a time.
I was going to try the attenuators first so as to not have to rewire, and if they work leave it alone. To rewire as unbalanced... I would put jumpers across 2 of the connections, correct?

Krell Showcase 7.1, (3) JBL 2360As/EV DHA-1s, (3) 1/4 Pie bass bins, Xilica XP-4080 crossover, (2pr) JBL 8340As,  (1pr) JBL 8320s, PS3, XBox360, (2) Intel NUCs, Blue Jeans 7.1 Cables, Redmere HDMI cables, Monster HTPS7000, 2 DTS-10 subs, Panasonic AE8000, SeymourAV 180 (195" diagonal) scope screen, Darbee Darcet, (1) Yamaha P7000s, (1) Yamaha MX-A5000, MiniDSP DDRC-88A, and an Oppo 103.
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Old 08-05-2015, 08:55 AM
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Quote:
Originally Posted by ellisr63 View Post
I was going to try the attenuators first so as to not have to rewire, and if they work leave it alone. To rewire as unbalanced... I would put jumpers across 2 of the connections, correct?
negative to ground.

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Old 08-05-2015, 11:38 AM
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Originally Posted by AustinJerry View Post
Can we assume you will try the MiniDSP Support recommendation before trying attenuators? Remember, it is always good practice to only make one change at a time.
I believe i already have the Dirac knocked down to 4v... I will double check today.

Krell Showcase 7.1, (3) JBL 2360As/EV DHA-1s, (3) 1/4 Pie bass bins, Xilica XP-4080 crossover, (2pr) JBL 8340As,  (1pr) JBL 8320s, PS3, XBox360, (2) Intel NUCs, Blue Jeans 7.1 Cables, Redmere HDMI cables, Monster HTPS7000, 2 DTS-10 subs, Panasonic AE8000, SeymourAV 180 (195" diagonal) scope screen, Darbee Darcet, (1) Yamaha P7000s, (1) Yamaha MX-A5000, MiniDSP DDRC-88A, and an Oppo 103.
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Old 08-14-2015, 07:46 AM
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I am getting ready to order a Mini DSP 2x4 balanced. I was going to order the "kit" version but have a question. In the order drop down it asks if i want to add a "Volume control pot" ?Now if i order the full box version it says that a Volume control pot is not needed. So my question is do i need one?

Thank you
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Old 08-14-2015, 11:05 AM
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Originally Posted by splatee View Post
I am getting ready to order a Mini DSP 2x4 balanced. I was going to order the "kit" version but have a question. In the order drop down it asks if i want to add a "Volume control pot" ?Now if i order the full box version it says that a Volume control pot is not needed. So my question is do i need one?

Thank you
I'd say no. Do you "need" a knob on the miniDSP to control the output volume?
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Old 08-14-2015, 01:50 PM
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I'd say no. Do you "need" a knob on the miniDSP to control the output volume?
Ok i will go ahead and order the kit version then. Thank you
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Old 08-19-2015, 07:10 AM
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In case anyone is curious, you can now order the minidsp products through avs. I just ordered a balanced 2x4 from them yesterday.
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Old 09-02-2015, 10:10 PM
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Hi guys

looking at getting the minidsp 2x4. would i need the unbalanced or balanced one.

My receiver is the yamaha rx2040 and the two subs are Aaron 120 and DIY sub powered by inuke .
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Old 09-03-2015, 03:44 AM
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Hi guys

looking at getting the minidsp 2x4. would i need the unbalanced or balanced one.

My receiver is the yamaha rx2040 and the two subs are Aaron 120 and DIY sub powered by inuke .
You would want to get the balanced one.
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