steve-bbb Posted September 14, 2012 Share Posted September 14, 2012 just in case anyone was wondering about the unlabelled buttons on the back of the hartke heads email reply from samsontech.com support The upper switch is a ground lift, so if you're getting a 60 Hz hum from a ground loop, pressing the switch should help eliminate the problem. The lower button is a Pre/Post switch so you can choose to send your signal with or without EQ to a mixer. Pushing the switch in sends a post-EQ signal out. The frequency cut off of the HPF is at around 30Hz, and is designed mainly to protect your woofers from blowing out from lower frequencies. The slope is about 6-8dB/octave depending on the amp. Quote Link to comment Share on other sites More sharing options...
barkin Posted September 14, 2012 Share Posted September 14, 2012 (edited) [quote name='steve-bbb' timestamp='1347626719' post='1803243'] just in case anyone was wondering about the unlabelled buttons on the back of the hartke heads [...] The lower button is a Pre/Post switch so you can choose to send your signal with or without EQ to a mixer. Pushing the switch in sends a post-EQ signal out. [/quote] I think the pre/post is t'other way around - with the button pushed in, it's pre. Edited September 14, 2012 by barkin Quote Link to comment Share on other sites More sharing options...
barkin Posted September 14, 2012 Share Posted September 14, 2012 (edited) Well, that's a bit crap! Image seems to have shrunk when I attached it... [url="http://www.ebay.com/itm/Hartke-HA2500-Bass-Guitar-Amplifier-Head-10-Band-Graphic-EQ-HA-2500-/280652262707"]http://www.ebay.com/...0-/280652262707[/url] appears to show it the other way about to the image above ! So that's one (the blurry one above - sorry) showing in/pre, while the one on ebay is in/post. So what's what on the unmarked ones is "suck it and see", I guess. Edited September 14, 2012 by barkin Quote Link to comment Share on other sites More sharing options...
steve-bbb Posted September 15, 2012 Author Share Posted September 15, 2012 thanks - just screengrabbed it and enlarged/sharpened a wee bit (NOT MINE) taking a wild guess that mine might be an earlier model before they recitifed the mistake perhaps ??? (MINE) Quote Link to comment Share on other sites More sharing options...
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