Proline 3000 - People blowing drivers or Amp |
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Tonskulus
Registered User Joined: 15 September 2017 Location: Finland Status: Offline Points: 425 |
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So you think the output transistor alone is not blocking the reverse energy? Think about it.. they do! Only one way current is possible as well as with those diodes. Also keep in mind, output stage has complementary bjt pairs. So there is actually no blocking for +/- reverse current as you might think :) And there is no diodes on high voltage rails. Class H/G amp may have big damping factor = amplifier has cone control and thus it is not free floating.. I have some QSC mx3000a's, they are class H (or G). One of the best cone control I have seen! Edited by Tonskulus - 09 April 2019 at 6:38pm |
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levyte357-
Old Croc Joined: 27 July 2012 Location: UK, South East Status: Offline Points: 8128 |
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I have a pair of JBL MPX1200s (rebadged Mx3000a), one is in the house, connected to the TV..
Maybe I should stop trying to sell one and keep it. |
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Global Depopulation - Alive and Killing.
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Tonskulus
Registered User Joined: 15 September 2017 Location: Finland Status: Offline Points: 425 |
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Yes, they are indeed same amps. Just amazingly good for bass, no anomalies or anything to worry about.
I also had some Tamp ta1400's for a while, great little amps too as being class H (after I repaired some bad solder joints and one faulty bridge rectifier). No signs of losing cone control. I need to get proline 3000 for my test bench, just to find out if there is something wrong at clipping.. Edited by Tonskulus - 09 April 2019 at 8:48pm |
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thes
Registered User Joined: 24 May 2018 Location: Italy Status: Offline Points: 29 |
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Another interesting fact to consider is the difference in slew rate between the proline 3000 and the ta2400: Proline 3000 45V TA2400 60V pretty strange considering how much bigger the proline 3000 is. Made some research and noticed that a lot of big amps (way bigger than the TA 2400) have slew rates of approximately 45V...so they are supposed to give less bass impact compared to the TA2400? Point is that the most part of bigger amps don't seem to have bigger damping factors/slew rates than smallish amps (qsc rmx 5050 has smaller damping factor than the rmx 2450 for example). Cerwin vega cv 5000ìs damping factor is 300 Even the monster crest ca 10001 has a damping factor of 500... Crown ma5000vz slew rate is only 30!!!! (Damping factor is outstanding at "greater than 1000")
Edited by thes - 13 April 2019 at 6:37pm |
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Tonskulus
Registered User Joined: 15 September 2017 Location: Finland Status: Offline Points: 425 |
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Total damping factor drops anyway down to 10...40 typically when speakers and speak cables are connected.
Tamp TA1400, similar to TA2400, produces indeed tight bass. I actually liked it pretty much. Low damping factor amp might be compensated using highly damped speakers. Once I tested my Cubo15 subs with tube amplifier having very low DF.. it was still tight and punchy, I was actually pretty surprised how loud and clean it was! Edited by Tonskulus - 14 April 2019 at 7:04pm |
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thes
Registered User Joined: 24 May 2018 Location: Italy Status: Offline Points: 29 |
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I do know that damping factor drops to 10 - 40 when the amp is connected to speakers, especially those that use a passive crossover, but this happens when you have a damping factor of, let's say 100 - 150 and cables around 20 awg are involved. I don't think that with an amp that has 1000 or 2000 of damping factor you'll end up with no more than 40 at the speakers, especially if you use active crossovers and something like 8 or 6 awg cables (or less)
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JulianDA
Registered User Joined: 29 May 2018 Location: Soest, Germany Status: Offline Points: 112 |
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My partner in crime also wrote an E-Mail to Thomann requesting the new information on the amp. They told us that it is still the same amp and that the class H rating was in fact an error the whole time...i dont know what to think, especially because it also got cheaper
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levyte357-
Old Croc Joined: 27 July 2012 Location: UK, South East Status: Offline Points: 8128 |
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If new amp lighter than 37kg, erm...
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Global Depopulation - Alive and Killing.
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gen0me
Young Croc Joined: 20 February 2016 Location: UK Status: Offline Points: 999 |
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There is no point for a bass amp to have such a big slew either. Lets take as example 5 samples(44.1k/1s) voltage swing from maximum voltage to minimum. Thats close to maximum angle at which samples are falling during bass drop. 5/44.1k~113us. Even counting some ridicolous power on the speaker in worst impedance scenario. sqrt(3kw*8ohm)*2sqrt(2)~438V 3.9V/us I wouldnt want to test it thought.
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Western Mystics
New Member Joined: 12 October 2019 Location: Waterford/Cebu Status: Offline Points: 6 |
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Anyone got their hands on the new model proline 3000 in the meantime? Curious to hear after reading thread.
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Fred_dibna
Registered User Joined: 24 September 2018 Status: Offline Points: 213 |
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There's a new Proline 3000? I didn't know that I sold my two because they sounded bad at clipping and I was afraid of blowing drivers when reading many things about people blowing drivers. I never knew why they as soon as they clip they're so amazingly destructive to drivers where many amps out there from QSC, Crown etc..are able to be clipped (which obviously is never advisable) and yet drivers can survive. Does anyone have any ideas if the new Proline 3000 is an improvment or maybe just the same, dangerous to drivers?
On a side note I do remember quite a few people in the past saying the Crown MA5002 were dangerous when clipped and at clipping could destroy drivers. By the way regarding the TA2400 i'm sure i've read on this very foreum that they're not good on bass especially when bridged as they can't handle 4 ohm bridged well or at all, can't remember the actual details but i'm sure I read something like that.
Edited by Fred_dibna - 27 October 2019 at 9:36pm |
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ali4994
Registered User Joined: 11 August 2016 Location: Leeds Status: Offline Points: 24 |
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Don't suppose you could post your limiter settings? I'm a simpleton when it comes to limiters but would love a tested second line of defence between my driver's and my 3000 |
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