Thread View: rec.audio.high-end
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Started by Chris Mouzouris
Tue, 26 Jan 1993 22:00
Bridged Amps and Hafler DH120 Mods
Author: Chris Mouzouris
Date: Tue, 26 Jan 1993 22:00
Date: Tue, 26 Jan 1993 22:00
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1413 bytes
Hi, I have a pair of Hafler DH120's power amps which I run in bridged mode. I have read that bridged amplifiers can suffer from 'load sensitivity' and am wondering - 1) If this is true? 2) If so, why? 3) Can this be corrected? I am also after any recommendations/information regarding relatively simple upgrades that can be made to these amplifiers. I have already made the following modifications - 1) Replaced the input RCA's (the standard ones are rubbish) 2) Added an IEC mains socket (much more convenient) 3) Replaced speaker cable binding posts I am planning to 'hardwire' them in bridged mode and attempt to bypass the ambience recovery switch/circuitry. Any other suggestions/warnings would be most appreciated. Thanks, ----------------------------------- Chris Mouzouris GPO Box 5215 Sydney NSW Australia 2001 -----------------------------------
Re: Bridged Amps and Hafler DH120 Mods
Author: lenahan,grant f
Date: Tue, 26 Jan 1993 14:19
Date: Tue, 26 Jan 1993 14:19
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(Chris Mouzouris) writes: > Hi, > I have a pair of Hafler DH120's power amps which I run in bridged mode. > I have read that bridged amplifiers can suffer from 'load sensitivity' > and am wondering - > > 1) If this is true? It can be. > 2) If so, why? Because bridged amps run their outputs in serial, thus the output impedance is 2X unbridged. The Hafler has sufficiently low output Z to be OK bridged, but its power supply will current limit sooner than really big amps. > 3) Can this be corrected? Not practically. Keep in mind that alll Krell MDA-series amps run this way, so its not really a problem. > > I am also after any recommendations/information regarding relatively simple > upgrades that can be made to these amplifiers. I have already made the > following modifications - > > 1) Replaced the input RCA's (the standard ones are rubbish) > 2) Added an IEC mains socket (much more convenient) > 3) Replaced speaker cable binding posts > Dunno about the newer Hafler stuff, but the old (DH200/220) had poor sounding bridgeing circuitry. An external "balancing module" that does the same thing is available from Sonogy , but its kinda costly in comparison to the Hafler equipment. Very good, though. The Haflers also benefit from capacitor upgrades in the signal path - many are poor (sonic) quality electrolytics and ceramic discs. Film type parallels help significantly. Grant
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