strange noise (from ISA-428?)

Jomppa · 5th June 2005

Hi, newbie here...

First, I´m sorry about my poor english but I hope You will understand my problem (and hopefully I will get some help..).

I have Focusrite ISA-428 and MH-442 AD expansion card. I was just recording acoustic bass and I noticed a strange noise. I used Sennheiser 441 mic. I tried all the channels of 428 (1-4), same noise every time. When connected to Sytek MPX-4A (ch. 5-8) I didn´t notice any noise. Then I tried my other mics: With all my dynamic mics (421,441,57,M201), there was that same noise when I used 428s channels 1-4, and no noise when I recorded through Sytek. And there´s no noise when I use my condenser mics, no matter what channel I use.

Digi002R, 428, Sytek, monitors, DAW, everything is connected to the same AC circuit. Then I tried the following: In my control room ONLY 428 connected to the AC, mic into ch. 1 (then 2,3,4), I listened using the insert send of the 428… same noise.

This thing is driving me crazy! Can You tell me what is my problem and what should I do to get rid of this noise?

Thank You,
-Jomppa-

Dangerous C · 20th March 2006

Troubleshoot! Damn you, troubleshoot! Nah, It's odd that it's a noise going through all the dynamic mic's only. The 428 has a variable impedance setting on each of the pre's. Have you tried every impedance with the dynamic mic's? I don't see how that could be the culprit for the noise if the unit is healthy. Could be something in there, sick and freaking out. What does 'noise' mean here anyhow? 50/60 cycle? Pink? A description could help you.
Good luck anyhow.

C

kurt · 1st April 2006

Try to power of 428 for a few seconds.

Snatchman · 1st April 2006

Just a thought. Might be the transformers in the 428 vs none in the Sytek. I have the same problem sometimes, when I record with my Brick (transformer) vs Presonus Digimax ( no transformers). If this is the type of noise you are hearing. Hum? Just a thought.......

whereisbkp · 2nd April 2006

not sure what kind of noise you;re hearing,
but i was recently hearing clicks and pops from my ISA 428.
when i changed the clock setting on my Motu Traveler interface from "internal clock"
to "ADAT lightpipe" it was fixed.
-bkp

5th June 2005	#1
Jomppa Gear interested Join Date: Jun 2005 Posts: 27 Thread Starter	strange noise (from ISA-428?) Hi, newbie here... First, I´m sorry about my poor english but I hope You will understand my problem (and hopefully I will get some help..). I have Focusrite ISA-428 and MH-442 AD expansion card. I was just recording acoustic bass and I noticed a strange noise. I used Sennheiser 441 mic. I tried all the channels of 428 (1-4), same noise every time. When connected to Sytek MPX-4A (ch. 5-8) I didn´t notice any noise. Then I tried my other mics: With all my dynamic mics (421,441,57,M201), there was that same noise when I used 428s channels 1-4, and no noise when I recorded through Sytek. And there´s no noise when I use my condenser mics, no matter what channel I use. Digi002R, 428, Sytek, monitors, DAW, everything is connected to the same AC circuit. Then I tried the following: In my control room ONLY 428 connected to the AC, mic into ch. 1 (then 2,3,4), I listened using the insert send of the 428… same noise. This thing is driving me crazy! Can You tell me what is my problem and what should I do to get rid of this noise? Thank You, -Jomppa-

1st April 2006	#4
Snatchman Lives for gear Join Date: Sep 2004 Posts: 3,320	Just a thought. Might be the transformers in the 428 vs none in the Sytek. I have the same problem sometimes, when I record with my Brick (transformer) vs Presonus Digimax ( no transformers). If this is the type of noise you are hearing. Hum? Just a thought....... __________________ Thanks for your time and ears!

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread starter	Forum	Replies	Last Post
Isa 220 or 428	P. Rene	High end	16	1 Week Ago 12:37 PM
Focusrite ISA 428 or ................	fastlane	High end	22	19th May 2006 09:29 AM
AD on the ISA 428.....decisions....	Nevelicious	So much gear, so little time!	6	16th December 2004 06:56 AM
ISA 428 VU-meters	blackcom	High end	2	2nd August 2004 07:45 AM
focusrite isa 428	edyer	So much gear, so little time!	2	20th April 2004 11:50 PM

20th March 2006	#2
Dangerous C Gear nut Join Date: Feb 2006 Location: Sydney, AU Posts: 84	Troubleshoot! Damn you, troubleshoot! Nah, It's odd that it's a noise going through all the dynamic mic's only. The 428 has a variable impedance setting on each of the pre's. Have you tried every impedance with the dynamic mic's? I don't see how that could be the culprit for the noise if the unit is healthy. Could be something in there, sick and freaking out. What does 'noise' mean here anyhow? 50/60 cycle? Pink? A description could help you. Good luck anyhow. C

1st April 2006	#3
kurt Lives for gear Join Date: Sep 2004 Location: Sweden Posts: 708	Try to power of 428 for a few seconds.

2nd April 2006	#5
whereisbkp Lives for gear Join Date: Jan 2006 Location: Nevada City, CA Posts: 659	not sure what kind of noise you;re hearing, but i was recently hearing clicks and pops from my ISA 428. when i changed the clock setting on my Motu Traveler interface from "internal clock" to "ADAT lightpipe" it was fixed. -bkp