Hiss from driver |
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LjudLahger
Young Croc Joined: 31 July 2008 Location: Sweden Status: Offline Points: 838 |
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Posted: 18 October 2022 at 9:05pm |
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Hi
When I do some listening and tweaking in my living room, I can hear a hiss from my driver clearly. I would like to be able to listen to music like a hifi. My solution has been a 33ohm resistor to get it down but I would like to know if there is anything I could do, in my amp to get it down. The driver is a B&C DE500 on a XT1086 horn and amp Amtech ASPL 6x100 an oldschool passive amp 6ch like new. Perfect for my diy living room rack. I have read in a few threads here that if this accurse just turn down the levelnobs on the amp, but this amp does not have any…and the other amps mentioned was class D if that matters? Is this true? I would really like to use this amp but is it old technology and I need a better one with higher s/n ratio? Many thanks
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LjudLahger
Young Croc Joined: 31 July 2008 Location: Sweden Status: Offline Points: 838 |
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Elliot Thompson
Old Croc Joined: 02 April 2004 Location: United States Status: Offline Points: 5172 |
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You can use a potentiometer as it is a variable resistor. Very common in Hi-Fi passive crossovers to dampen the high frequencies.
Best Regards,
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Elliot Thompson
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MarjanM
Old Croc Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7810 |
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Turn the amp down like half way.
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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BJtheDJ
Young Croc Joined: 28 November 2012 Location: Bristol Status: Offline Points: 884 |
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OP said "just turn down the levelnobs on the amp, but this amp does not have any…"
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kipman725
Registered User Joined: 02 September 2020 Location: Warrington Status: Offline Points: 231 |
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if the amp still hisses with a shorted input there is nothing you can do (the amp is generating the noise) apart from padding down the comp or getting a higher SNR amp (or lower power with the same SNR). If the hiss is reduced when the input is shorted then an inline attenuator will improve SNR. Your crossovers maximum linear output and the input sensitivity spec of the amplifier give you the optimal attenuation if you wish to retain full output capability. EG. at home I use 14dB attenuators as my DSP can output +14dB more than my amps need to clip. Without the attenuators I also hear hiss.
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LjudLahger
Young Croc Joined: 31 July 2008 Location: Sweden Status: Offline Points: 838 |
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Thank you all for your input.
I will try shortening inputs to driver channel and a/b listen. If still hiss I know its the amp.
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Elliot Thompson
Old Croc Joined: 02 April 2004 Location: United States Status: Offline Points: 5172 |
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Simply put. The Compression Driver is picking up the noise floor of the amplifier. This is a common trait when using highly sensitive compression drivers in your home. This is why, many will reduce the sensitivity of the driver with a resistor or potentiometer. That is the benefit of a passive crossover. Best Regards,
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Elliot Thompson
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