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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10920 |
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Production Partner test with 12 dB Crest Factor pink noise, as per the AES standard, as well as sinus bursts. Before anyone shows off some tunes with a CF of 6-8 dB in the low frequencies, they should generate a 6 dB CF broadband pink noise stimulus & apply a 30 Hz 4th order high pass filter and 100 Hz 4th order low pass filter IIR EQ to it in a DAW. Then use a VST to analyse the resulting CF |
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kipman725
Registered User Joined: 02 September 2020 Location: Warrington Status: Offline Points: 231 |
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I just re-read and yes 12dB... defo wouldn't want to put a sub anywhere near that amp ha. Any idea if the X8 is much better? (more airflow) |
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10920 |
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Are you sure? Its got enough power for most dual-18 reflex, especially when sensibly loaded across the channels so the power sharing feature kicks in. I can burn almost any modern 18" on the planet with an X4, despite it 'only' offering 540 Watts continuous per channel long-term when all four channels are loaded. This is clear when you look at a driver's delta Tv values from their Klippel LSI data The X8 is better than the X4 due to having bigger fans & intake vents - you get more time of spanking it before the thermal management kicks in. Still best practice is to load it asymmetrically, but we often run subs off all 8 channels and don't find it lacking. I've shown this elsewhere because it keeps coming up; the highest ranking 4-channel lightweight in that category is the Linea 44M20 at ~920 Watts, but this translates to a little over a decibel more output in reality once power compression is factored in. Likewise, these are continuous output values; music is dynamic, and 5,000 Watts+ for peaks is what you actually need to play it well. |
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kipman725
Registered User Joined: 02 September 2020 Location: Warrington Status: Offline Points: 231 |
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I agree that dynamic headroom is a priority over sine wave power but the X4 seems to have taken it to an extreme. I don't have personal experience with these amps so its good to hear that in the real world that they work fine. The PP review gave me the impression that an X4 run near full output would sound like a server farm and become thermally limited during a show when loaded 2/4ohm. Saying that I was designing my own sub amp at the beginning of lockdown that took the concept of dynamic headroom even further. The concept was to use a constant current supply to charge a capacitor bank and escew isolation of the power stage (inputs isolated instead amplifier would be a plate amp). This capacitor bank would provide the DC bus for a subwoofer amplifier using a look ahead limiter. I did a basic feasibility analysis using a kick drum sample filtered to sub bandwidth. From this analysis I see that I'm hitting peaks of >10kW with an average power of 1.32 kW. Applying this ratio to the long term all channel output power of the X4 @4ohm of 528W I get 4kW which is above the rated power at 4ohm. I would conclude that the X4 would actually be fine with this kick drum sample loading all 4 channels with subs as the long term power limitations would not be exceeded before the amplifiers clipped. What I would like to see are tests like this: https://data-bass.ipbhost.com/topic/917-robs-amp-tests/page/3/?tab=comments#comment-21756 |
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concept-10
Young Croc Joined: 17 May 2016 Status: Offline Points: 1292 |
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Not the case at all, one of our bought direct CVR 2002s went pop, the soft start went bang wrecking the board, one e-mail later and a whole new module arrived at the door ten days after it went bang totally free of charge, we have two PKNs that have been back at the factory for a couple of months with no idea when we will get them back.
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Esc4pe
Registered User Joined: 08 August 2021 Location: England Status: Offline Points: 165 |
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Impressive, I have a couple that i just accepted the fate of should they go wrong they were at a lower price point anyway. But I that’s good to hear! Hopefully CVR don’t push out a load of new releases like some of the other brands as might be a different story then. And yeah I’ve had pals in very similar situations with PKN even prior to covid and brexit
Edited by Esc4pe - 23 September 2022 at 8:51pm |
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Earplug
Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7199 |
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I haven't bought any of the latest (Chinese) lightweights - but did buy a load of heavyweights a few years ago. I made sure that they also provided several replacement modules for the amps. In the end, the amps proved to be very reliable and the modules are still unused, but I would never had bought unless the modules were available. Better safe than sorry. |
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Earplugs Are For Wimps!
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concept-10
Young Croc Joined: 17 May 2016 Status: Offline Points: 1292 |
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Which heavy weights did you buy ?
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valve head777
Old Croc Joined: 27 July 2012 Location: East Sussex Status: Offline Points: 1780 |
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I wouldn't mind knowing too, having taken ownership of something called a ca80. It looks well built, but I'm unsure of whether the components are fakes (njw output transistors). The company (Aimeek) seems to communicate well.
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Freedom of choice, choice of freedom.
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Elliot Thompson
Old Croc Joined: 02 April 2004 Location: United States Status: Offline Points: 5172 |
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There won't be a significant audible difference in terms of dB output. However, if you want to brag that you have the most powerful amplifier, the AD 42 wins. Best Regards, |
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Elliot Thompson
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Earplug
Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7199 |
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These:- And a couple of the "lighter" EX-1000:- I sold most on, but still have 2 of the 3400's working regularly. Definitely a solidly built amp. CA18 transformer?? Spare module:- Edited by Earplug - 24 September 2022 at 8:45am |
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Earplugs Are For Wimps!
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RAveriss
New Member Joined: 14 July 2022 Status: Offline Points: 1 |
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So what are your thoughts on this amp? Thinking of buying a couple myself. Thanks
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