Lower Driver Impedamce |
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Tonskulus
Registered User Joined: 15 September 2017 Location: Finland Status: Offline Points: 425 |
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And at lower driver impedance, maximum voltage will decrease.
There is actually a design flaw in Tamp TA-series amplifiers. It has built-in limiter but it only works for 8ohm load / ch to prevent clipping. When using 4ohms, amplifier will clip way before limiter kicks in because limiter itself has no idea about speaker output or rail voltage drop - it is only set to limit the input to a specific value which seems to be very accurate @ 8ohm loads and it works pretty well too! It barely never clips yet giving full power. At 2ohms / ch.. even worse. Good limiter should take account the actual output too. Edited by Tonskulus - 13 June 2019 at 11:31am |
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3118 |
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yeah, but when you play it on a system the distortion will mostly not go through the subs but through the kicks/mids. so even if the mastered track has a lower normalised bass level, you can just increase the gain relative to the other track so that the bass amps are still reaching max.
apart from that, the reduction in volume on the mastered track so that the added distortion does not lead to the voltage exceeding the normalisation threshold, is insignificant compared to the perceived increase in loudness from the distortion - this is both becuase of the steep slope of the fletcher-munson curve below 200Hz, and the psycho-acoustic perception of missing fundamental. |
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Chris Grimshaw
Registered User Joined: 10 September 2018 Location: Sheffield Status: Offline Points: 281 |
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Interesting. I saw someone use WaveLab (IIRC), and it reported about 2dB crest factor. Maybe they only analysed a few cycles of maximum amplitude, though, which would give that result. Thanks for the sanity check. Chris
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Quality sound from Sheffield
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gen0me
Young Croc Joined: 20 February 2016 Location: UK Status: Offline Points: 999 |
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Never tested it on full soundsystem. Always only on 1amp+ fullrange. Im curious. Could be a challenge concerning it will be harder to get the same integrity of sound on crossover 80-150hz than on home audio 600Hz.
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U.Viktor
Young Croc Joined: 04 May 2010 Status: Offline Points: 716 |
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the thing is that almost *ALL* amp circuitry are based on some type of half-bridge topology (for simlicity & cheapnesss) which operates +/- rails referred to the Ground. Unfortunately the power stage devices suffering 2V_output + 2V_drop Voltage stresses which means if you need let us say: 200V_peak output and you have '0.9 modulation capability' (due some losses in filters & semiconductors + wiring) the effective device Voltage stress will be 200V * 1.1 * 2 = 440V And here I did not even mention that rails would drop, not small (!) especially on low frequencies. Switching 440V in this "Two level structure" (or above) with 50-100A @250-350KHz (which frequnecy IS required for good accurate signal reproduction) IS a problem even with today fastest semiconductor devices. There are tricks to solve the issues like using SiC MOSFET or deploy some soft switching, but all has downsides. Also the two +/- rails could easily go to unbalanced conditions <low-frequency, large signals!> which affects the output signal quality. All Powersoft K, X series, LabGruppens, Crown I-techs suffersing the same unfortunate event! I better like PKN's approach with already full-bridged circuits, they have a single rail in the XE series (NO bridge ability) but everything always balanced, no rails over/undershoot issues. The H8 went even further on the same path.. |
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10920 |
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Any H8 actually been used on a gig yet?
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jammin75
Old Croc Joined: 08 July 2012 Location: west midlands Status: Offline Points: 2375 |
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see where u goin on the way to a gig Edited by jammin75 - 18 June 2019 at 8:13pm |
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feel the vibes !!! "Who Feels it Knows it" Strong like Lion
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Tonskulus
Registered User Joined: 15 September 2017 Location: Finland Status: Offline Points: 425 |
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Behringer Inuke 6000 and 12000 has also fullbridge output stages so these amps cannot be bridged anymore. But yes, bus voltage pumping is common issue in (poorly designed) half-bridge class-D topologies. Well, one trick is to invert one channel (180deg) out of phase but this is only suitable for stereo/2ch amp having exactly the same signal going through both channels. Edited by Tonskulus - 18 June 2019 at 8:41pm |
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simo69
Old Croc Joined: 29 September 2005 Location: United Kingdom Status: Offline Points: 1890 |
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E90 Mc2 will power a pair of 21DS115 at 4oms per channel
Edited by simo69 - 10 July 2019 at 10:13pm |
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