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Best for Crown Macro-Tech 5002VZ
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kanalogue23 View Drop Down
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    Posted: 19 June 2023 at 2:35am
Originally posted by shaun1264 shaun1264 wrote:




The last of the Anniversary Limited Edition Macro-Tech 5002 coming off the production line.

That's some amazing piece right there!! Congrants
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Originally posted by FOO FOO wrote:

Anyone up for a limited 2402? Clap
Never been switched on. What a sexy piece of gear!!

https://www.dba.dk/crown-macro-tech-2402/id-508607015/

I felt very lucky to find 2 pieces of MacroTech, a 5002 and 2402, simply lovely workhorses, i am on my way into buying a third MA3600VZ to complete the rack!
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Points: 750 		Post Options Post Options   Thanks (0) Thanks(0)   Quote FOO Quote  Post ReplyReply Direct Link To This Post Posted: 17 June 2023 at 6:22pm
I had one slipping thrue my fingers. It's was either the amp (still in the box), or a set of JBL studio monitors. I went with the monitors. Sometimes i regret LOL
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Originally posted by shaun1264 shaun1264 wrote:


The last of the Anniversary Limited Edition Macro-Tech 5002 coming off the production line.  Personally signed by Gerald Stanley.

I can only dream to own one of those Confused
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shaun1264 View Drop Down
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Points: 258 		Post Options Post Options   Thanks (0) Thanks(0)   Quote shaun1264 Quote  Post ReplyReply Direct Link To This Post Posted: 17 June 2023 at 5:31pm



The last of the Anniversary Limited Edition Macro-Tech 5002 coming off the production line.  Personally signed by Gerald Stanley.


Edited by shaun1264 - 17 June 2023 at 5:39pm
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Originally posted by EmPro EmPro wrote:

Let me make this crystal clear,any macrotech will work even in dead short with some sound on the outputs,the main reason why they do that without blowing up like most of other amps do is because of the clever limiter control of the output stage ODEP stands for (Output Devices Emulation Protection) so basically this circuit track in real time the temperature of the heatsinks where the O/P are located and limit the current they drive to a safe operating area as the temperature goes up,so basically when you use the amp in such a low impedance it is working but will produce a lot of heat and is not performing as it should as the ODEP is always active to keep the amplifier runing,so in order to fully enjoy your Macrotech you need to respect the minimum load impedance on the outputs,driveing in 4R stereo you will have good improvement,plenty of headroom and no limitation as you have now,so basically will sound way better,most of people think that going down and down in impedance will have more and more power,in most of the case is working with other amplifiers untill they blow up due to thermal run away or exceeding SOA,with macros is quite opposite,going down and down in impedance you will loose a lot of power,you need to understand that the heat from the radiators is a part of the power you should have it in the speakers...but in such low load is converted into heat...if you are happy with that use it like that,and no,it will not work forever,eventually the ODEP will be decalibrated and the amp will blew up like fireworks,also the output devices running hot almost to there destruction will get serious internal damage and loose the Hfe badly untill blows up,i've seen hundreds of Macros 5000vz,5002vz blown up badly exactly because of that,i have a lot of friends that have same original amplifiers with totally different sound from them drived by same distribution unit and they scratched there heads why some of them are ,,louder'' then others,they swap speakers cabs,cables etc etc no effect,the reason is that the amplification factor of those amplifiers is different because there output devices had different lifes...ones drived hard and trashed and others not,now you can guess wich one performs better then others Wink same thing happens to speaker coils when drived hard and high temperatures occurs,you will loose forever good amount of Db from that speaker...it will work after? yes will do,it will perform!? No,never again!


Absoluty spot on. 

I once was called to a setup which had a Crown Power Tech 1 (grounded bridge) complaint was distortion after about an hour and amp getting hot.  Nothing wrong with amp but a full on dead short in the cable!

You are better off running the amp over 4ohms each channel to maximise damping factor.  Use nice 4mm cable and not too long.  The bass will be incredible and tight.
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Jesus...that's a lovely MacroTech....i have one 2401 Big smile
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Anyone up for a limited 2402? Clap
Never been switched on. What a sexy piece of gear!!

https://www.dba.dk/crown-macro-tech-2402/id-508607015/


Edited by FOO - 17 June 2023 at 4:44pm
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Originally posted by KDW32 KDW32 wrote:

Anyone mention that crown shouldn't make traffic lights? Red odep light means good. No red light during operation, no drivers. Bright green signal light means clip. Tongue
Speaking of...i replaced the diffused red led's with blue ones in odep indicators,looks way cooler like that LOL
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Points: 474 		Post Options Post Options   Thanks (0) Thanks(0)   Quote KDW32 Quote  Post ReplyReply Direct Link To This Post Posted: 17 June 2023 at 4:12pm
Anyone mention that crown shouldn't make traffic lights? Red odep light means good. No red light during operation, no drivers. Bright green signal light means clip. Tongue

Edited by KDW32 - 17 June 2023 at 4:12pm
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Originally posted by Lucasdude Lucasdude wrote:

That's a lucid explanation of the ODEP system. Thanks EM!
That's the most basic explanation about ODEP i can provide for anyone to understand the basic function of it,in reality is far more complex then that,and is the only reason why we see MacroTech's keep playing around these days,after 30+ years,however the 5000vz series are the most trashed and blown up amplifiers from the rest of MacroTech's series,unfurtunately a lot of 5000vz series have the outputs already replaced with MJ-s not matched and the amplifiers performance is done for good,the reliability and performance of any Macros relyes in matched outputs and perfect calibration of the: Bias,Odep and CMR,what i'm tying to explain is the fact that any amplifier can be fixed no problem,but an amplifier made with matched output devices such as Macro's will perform only with matched devices....so anyone wanna buy 2.000 transistors at 5£ one piece to see how many we can match!?!?....yeah...f_ck that indeed,so we better don't trash our amps if we need them.


Edited by EmPro - 17 June 2023 at 2:41pm
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That's a lucid explanation of the ODEP system. Thanks EM!
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