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  #1  
Old 06-07-2008, 08:51 PM
Ricoshady Ricoshady is offline
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Join Date: Jun 2008
Posts: 2
Default Hum/Noise problems

I just got a mbox2 mini and so far I'm pretty disappointed. Right after connecting my outputs (standard 1/4 RCA cable, not balanced) into my monitors I immediately hear noise on the line. Its very faint but enough to where I can hear it without much trouble. Odd, when I adjust the volume it doesn't increase or decrease. When I use the same cables directly out from my mixer (no mbox) and there is no hum or noise.


Also, some interesting extras. When I have the mix all the way to the left on input, and I'm not in Pro Tools, the hum is not there. When I load protools the hum starts, when I go to playback engine and change a setting, the sound stops, and once I press ok and it returns to the editor, it starts again. It even has the hum when I mute the monitors, what the?

Here are my system attributes.

System
Host Name : RICOSHADY
User : Ricochet
Workgroup : WORKGROUP

Processor
Model : AMD Sempron(tm) Processor 2800+
Speed : 1.61GHz
Model Number : 2800
Cores per Processor : 1 Unit(s)
Threads per Core : 1 Unit(s)
Internal Data Cache : 64kB, Synchronous, Write-Back, 2-way, Exclusive, 64 byte line size
L2 On-board Cache : 256kB, ECC, Synchronous, Write-Back, 16-way, Exclusive, 64 byte line size

System
Mainboard : Gigabyte Technology Co., Ltd. K8M800-8237
Bus(es) : AGP PCI IMB USB i2c/SMBus
Multi-Processor (MP) Support : No
Multi-Processor Advanced PIC (APIC) : Yes
System BIOS : Award Software International, Inc. F7
Total Memory : 1.44GB DDR

Chipset
Model : VIA K8M400 CPU to PCI Bridge
Front Side Bus Speed : 2x 804MHz (1.61GHz)
Shared Memory : 1MB

Chipset
Model : AMD Athlon 64 / Opteron HyperTransport Technology Configuration
Front Side Bus Speed : 2x 804MHz (1.61GHz)
Total Memory : 1.5GB DDR
Memory Bus Speed : 2x 161MHz (322MHz)

Physical Storage Devices
WDC WD3200KS-00PFB0 320GB (SATA150, 3.5", 7200rpm, NCQ, 16MB Cache) : 298GB (C:)
ATAPI DVD A DH20A4P (ATAPI66, DVD+-RW, CD-RW, 2MB Cache) : N/A (D:)

Logical Storage Devices
Hard Disk (C:) : 128GB (NTFS) @ WDC WD3200KS-00PFB0 320GB (SATA150, 3.5", 7200rpm, NCQ, 16MB Cache)
CD-ROM/DVD (D:) : N/A @ ATAPI DVD A DH20A4P (ATAPI66, DVD+-RW, CD-RW, 2MB Cache)
3.5" 1.44MB (A:) : N/A

Peripherals
LPC Hub Controller 1 : Giga-Byte VT8237 PCI to ISA Bridge
Audio Device : Giga-Byte VT8233/A AC'97 Enhanced Audio Controller
Serial Port(s) : 2
Parallel Port(s) : 1
USB Controller 1 : Giga-Byte VT82xxxxx UHCI USB 1.1 Controller (All VIA Chipsets)
USB Controller 2 : Giga-Byte VT82xxxxx UHCI USB 1.1 Controller (All VIA Chipsets)
USB Controller 3 : Giga-Byte VT82xxxxx UHCI USB 1.1 Controller (All VIA Chipsets)
USB Controller 4 : Giga-Byte VT82xxxxx UHCI USB 1.1 Controller (All VIA Chipsets)
USB Controller 5 : Giga-Byte VT6202/12 USB 2.0 Enhanced Host Controller
System SMBus Controller 1 : VIA VT823x SMBus

Printers and Faxes
Printer : Microsoft XPS Document Writer (600x600, Colour)

Network Services
Network Adapter : Realtek RTL8139 Family PCI Fast Ethernet NIC - Packet Scheduler Miniport (Ethernet, 100Mbps)

Power Management
Mains (AC) Line Status : On-Line

Operating System(s)
Windows System : Microsoft Windows XP (2002) Professional 5.01.2600 (Service Pack 2)
Platform Compliance : x86

Performance Tips
Warning 100 : Large memory sizes should be made of Registered/Buffered memory.
Tip 2546 : Large memory modules should be ECC/Parity.
Tip 2 : Double-click tip or press Enter while a tip is selected for more information about the tip.

Any ideas?

Thanks
Stephen
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  #2  
Old 06-09-2008, 01:20 PM
Hevywate Hevywate is offline
Member
 
Join Date: Jun 2008
Posts: 1
Default Re: Hum/Noise problems

Well my friend there could be a number of other things that could attribute to problems with your sound, signals and so forth. The simplest answer is that you probably have a ground loop. There is surely nothing wrong with your MBOX. There are a few ways to fix this!!!! First and foremost, please do not attempt to fix the loop yourself by alterting your plugs with an adapter or messing with your eletrical wiring. There are a few things that you can buy one is something referred to as a hum eliminator. Art and Ebtech both make one, though I would go with the Ebtech. If that doesn't fix your problem I would suggest you go with a power conditioner/surge protector. Monster cable makes several excellent power conditioners I myslef have a Monster Pro 2500. Thirdly, depending upon the type of cables you have I would suggest that you upgrade your cables to the correct balances and a better quality. You will be surprised how much better your sound quality can be by upgrading to better cables than the ones at Radio Shack. LOL......... Anyway, ground loops are tricky but please do plenty of research before you go out and buy a whole bunch of equipment. Sometimes simple things like changing your set up helps too by breaking up the loop. Start with the inexpensive ideas first then work your way up. Good Luck.
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