45worlds Forum - View Single Post - Equalisation Yes or No

Latest Posts » 78 RPM » View Topic

View Single Post

Topic: Equalisation Yes or No

31st Jan 2014, 11:52 AM
	Juke Jules SUBS Tell me he's lazy, tell me he's slow Member since Jan 2011 4150 Points Moderator	I've no experience of this, but just a thought: if you are inputting the cart to a 'Phono' equalised preamp then applying the inverse curve, could you try just inputting to a non-equalised input? Presumably you'd then just apply the new 'curve' A second thought, this time about the cart load: ""But, why do I need to even check it? Surely the equipment makers today have adopted the RIAA standard and built the correct playback curve into their gear?" The short answer is, probably they have. But, the problem is not in the amplifier circuit. The problem is in the cartridge loading. If the phono cartridge is not properly loaded with the correct resistance and impedance, it will not play back flat. It will send the wrong curve to the amplifier for decoding. In other words, garbage in - garbage out. Many modern preamps have user adjustable cartridge loading just for this purpose. (Ahem, like our Granite Audio preamp.) The RIAA feedback loop in the amp assumes that it is getting the correct curve to begin with. I've lost count of the number of systems that I've checked and found the frequency response off by 6 to 10 dB due to improper cartridge loading. That means the volume at certain frequencies was off by 4 to 10 times! Many times a 10 cent resistor is making an $800.00 cartridge squeal like a ruptured canary. Since most high end audio equipment is sans tone controls, the listener is stuck with some bad or harsh sounds." - from http://www.graniteaudio.com/phono/page5.html That sounds like a small soldering-iron job Edited by Juke Jules on 31st Jan 2014, 12:13 PM