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Proline 3000 running 4 x Kappa 15 LF |
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Mark James 
Old Croc 
Joined: 15 January 2006 Location: rig side Status: Offline Points: 5309 |
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 Posted: 13 February 2017 at 7:55pm |
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do a search on limiting prolines to find out more about hte inline attenuater mentioned previously and im afraid youl have to learn how to control your gain somewhat, howether once you got it right you will have a happy amp thats not being flogged to death and drivers that wont get "sodomized" [love that expression in this context should be mentioned in amp spec sheets... capable of sodomizing cat 1 drivers or whatever lol]
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me so horny me love you long throw
horn loaded for her pleasure |
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rosssss224
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Joined: 25 July 2012 Status: Offline Points: 447 |
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Posted: 13 February 2017 at 8:00pm |
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Ive done a decent of googling on limiting and had a look at a few calculators. From what I remember i needed -6db of attenuation plus the -22db of the ultradrive. However beginning to feel im missing something now.
Seems simple: -ultradrive limiter only goes to -22db -inline attenuator instantly knocks -10db (or whatever off) -effectively reduces the power of the proline making it more suited to the kappas
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rosssss224
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Posted: 13 February 2017 at 8:06pm |
Edited by rosssss224 - 13 February 2017 at 8:08pm |
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rosssss224
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Posted: 14 February 2017 at 11:10am |
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Assuming input sensitivity of proline is 0.775v Satisfied myself that...
0.775v = 0dBu With the limiter set at -22dB the output from the ultradrive will be constrained to 0.775v and the output from the amp to 1850w (bench test) Since 2 kappas in parallel is 1200w @4ohms need further limiting of 10 Log (1200/1850) = -1.87dB so total attenuation required is -22-1.87 = -23.87dB but....ultradrive limiter only goes to -22dB so install a -10dB inline attenuator on the berry sub output set berry limiter to -13.87dB (call it -15dB for safety) Match with 40Hz highpass and should be good to go
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cravings
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Joined: 30 January 2007 Location: Ireland Status: Offline Points: 7441 |
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Posted: 14 February 2017 at 11:29am |
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just run with a lower output channel gain?
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rosssss224
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Posted: 14 February 2017 at 11:35am |
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Edited by rosssss224 - 14 February 2017 at 11:36am |
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rosssss224
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Posted: 14 February 2017 at 11:36am |
The berry output gains come after the limiter stage so -22dB is as low as the limiters will go
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m0gsi
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Posted: 14 February 2017 at 1:15pm |
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The dials on the front of the amplifier are attenuators too Ross
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rosssss224
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Posted: 14 February 2017 at 1:23pm |
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Yes but also nice not not worrying someone decides they need turned up
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cravings wrote: