|
Crest 10001 |
Post Reply 
|
Page <12345 6> |
| Author | ||||
DMorison 
Old Croc 
Joined: 14 March 2007 Location: Aberdeen Status: Offline Points: 1740 |
 Post Options
 Thanks(0)
 Quote Reply
 Posted: 31 January 2018 at 1:18pm |
|||
And of you didn't shit yourself seeing the weight, there's a high chance you would if you tried lifting a rack of a couple of them... ;-)
|
||||
 |
||||
|
Dub Specialist Sound
Old Croc
Joined: 15 November 2013 Location: Smethwick Status: Offline Points: 4871 |
Post Options
Thanks(0)
Quote Reply
Posted: 31 January 2018 at 1:41pm |
|||
|
no problems , love my banks of 001 seroes ,
Heavweight, i want to add the 10001 too lovely
|
||||
|
Musical Roots Reggae Vibration is Life! for music is sound...sound is vibration...vibration is energy... and energy begets life. Therein lies my passion!...MUSIC IS LIFE...
|
||||
|
||||
|
Elliot Thompson
Old Croc
Joined: 02 April 2004 Location: United States Status: Offline Points: 5365 |
Post Options
Thanks(0)
Quote Reply
Posted: 31 January 2018 at 1:49pm |
|||
|
The only benefit the Crest 10.001 offered is being 1-ohm per channel stable. I recall taking part in a comparison using a Crest 10.001, Crown MA 5000vz and, a QSC PL 9.0 operating @ 2 ohms per channel. We used Danley BD32 and Bassmaxx B Zeros cabinets. This was around 2003.
From an SPL standpoint the Crest fell into last place, the Crown came in second and the QSC was first. The loudness test was based on how loud the cabinets would play on each amplifier before the clip light triggered. The Crest 9001 sold more than the 10.001 despite there was a mere $600 difference in terms of price. The Crest 9001 was released after the 10.001. Best Regards, Edited by Elliot Thompson - 31 January 2018 at 1:50pm |
||||
|
Elliot Thompson
|
||||
|
||||
|
logsquared1
Registered User 
Joined: 09 February 2017 Location: USA Status: Offline Points: 115 |
Post Options
Thanks(0)
Quote Reply
Posted: 31 January 2018 at 2:03pm |
|||
You had something wired wrong or the crest was defective. The MA5000vz can't hold a candle to the 9001 or 10001. I mean not even close! The PL9.0 would be louder as the voltage rails are much higher. However, at 2 ohms the 9001 or 10001 will be about = or have a slight edge over the PL9.0 in long term output for bass heavy music.
|
||||
|
||||
|
Elliot Thompson
Old Croc
Joined: 02 April 2004 Location: United States Status: Offline Points: 5365 |
Post Options
Thanks(0)
Quote Reply
Posted: 31 January 2018 at 4:17pm |
|||
There was nothing wired wrong as the person who wired the
amplifiers is a licensed electrician and the person in charge of installing the Crest 10.001 in the club in
which, the tests took place. Under the given scenario, the Crest 10.001 does not have an
edge over the 9001 under a 2 ohm per channel load. The QSC will consume a maximum of 125amperes and features PFC
How did you come to the conclusion that the Crown MA 5000vz cannot hold a candle to the Crest 10.0001 at 2 ohms per channel more so the Crest 10.001 will beat the QSC PL 9.0 at 2 ohms per channel “For Bass Heavy Music?”
The amplifier does not care what frequencies is being produced providing the power supply offers enough current to accommodate the given load.
The interesting thing (Again Stated in the Manual) is the Crest 10.001 shows 5000 watts as “Typical Music Program Material” and, 3500 watts as 20-20 kHz under 2 ohms per channel load. No other Crest Amplifier in the 01 series states “Typical Program Music Material.”
As I mentioned in my previous post…
Best Regards, Edited by Elliot Thompson - 31 January 2018 at 4:30pm |
||||
|
Elliot Thompson
|
||||
|
||||
|
levyte357-
Old Croc
Joined: 27 July 2012 Location: UK, South East Status: Offline Points: 8517 |
Post Options
Thanks(0)
Quote Reply
Posted: 31 January 2018 at 4:34pm |
|||
|
Other thing people forget is, what current will be needed, from the mains, without it sagging, to allow amp to output specified power output, at 2 ohms stereo !?
|
||||
|
Global Depopulation - Alive and Killing.
|
||||
|
||||
|
logsquared1
Registered User
Joined: 09 February 2017 Location: USA Status: Offline Points: 115 |
Post Options
Thanks(0)
Quote Reply
Posted: 31 January 2018 at 6:12pm |
|||
I think your mixed up a bit. 9001 have a 160 volt high rail 10001 is around 150V IRC Not sure on the 9.0. Probably about 175-180V I want to say the crown is 144V. Its been awhile that # could be wrong. However the crown can't maintain that level for very long at 2ohms anyway due to inadequate power supply and bullshit "ODEP" circuitry.
That's easy... I have owned over 10 of each the MA5K and 9001. Only had 1 of 10001's. Still have 4 9001 in service to this day. I can tell you first hand the MA5K is a piece of shit at 2 ohms. Second only to the MA3600 which I have on good authority should have never gone into production. Blame Crown marketing for that! Don't get me wrong the 9.0 is a wicked amp. My buddie ran his eaw rig on QSC pl's. When used with Rave music of the day they just seemed to "fall apart" at 2 ohms while my rig powered by 9001 just kept going on sub duty.
Do you mean the power supply internal to the amp, or the mains power feeding it? If the mains is solid, then it comes down to the amps internal power supply. This is where the MA5K and PL9.0 can't hold up to the crest. |
||||
|
||||
|
jbl_man
Moderator Group 
Joined: 12 January 2005 Location: London. Status: Offline Points: 11308 |
Post Options
Thanks(0)
Quote Reply
Posted: 31 January 2018 at 6:23pm |
|||
It should have castors fitted as standard! I remember a test publication on these monsters years ago by Ken Dibble,he criticised it for being the most stupid use of a 19" rack format he had come across,and even said that a single person trying to lift one could result in a very serious injury. By the way,he could get it nowhere near its claimed output figures,it kept shutting down even at 50% drive. |
||||
|
Be seeing you.
|
||||
|
||||
|
levyte357-
Old Croc
Joined: 27 July 2012 Location: UK, South East Status: Offline Points: 8517 |
Post Options
Thanks(0)
Quote Reply
Posted: 31 January 2018 at 9:31pm |
|||
|
Anyone know of cheap, fully working 9001s going?
Have a project idea.. |
||||
|
Global Depopulation - Alive and Killing.
|
||||
|
||||
|
Elliot Thompson
Old Croc
Joined: 02 April 2004 Location: United States Status: Offline Points: 5365 |
Post Options
Thanks(0)
Quote Reply
Posted: 31 January 2018 at 10:09pm |
|||
You are talking about the Peak Output Voltage Swing. I am talking about the voltage rails. The amplifier switches to its low rail and uses more current due to operating at a lower impedance load. The high rail comes into play for high impedance loads where you require more voltage but less current due to the impedance load you are driving. It is precisely the reason amplifiers designed today gives the user a choice on how to limit their amplifier… Peak Voltage or Current Limit. Crest 10.001 is current limited to 35.6 amperes per leg @ 2 ohms per channel. This is easily found in the “Architects & Engineering Specifications.” 71.2 amperes under a 120 volt line source is 4273.50 watts per channel @ 2 ohms. This is why, the 2 ohms per channel specifications states 3500 watts per channel from 20 – 20 kHz with no more than 0.1% THD Crest 9001 is current limited to 65 amperes @ 4 ohms per channel. This is easily found in the “Architects & Engineering Specifications.” If you load the amplifier into 2 ohms per channel, the current limit will still be 65 amperes however, you will be operating on the lower voltage rail. 65 amperes under a 120 volt line source is 3907.28 watts per channel @ 2 ohms. This is why, the 2 ohms per channel specifications states 3000 watts per channel from 20 – 20 kHz with no more than 0.1% THD 4273 watts versus 3907 watts yields a 0.38 dB gain in terms of SPL in favour of the Crest 10.001 Moving to the Crown 5000vz The Crown 5000 offers a Vz switch per channel in which you can select how the amplifier will respond on the load you are driving. This can be easily found in its manual. Crown even gives you the option to configure this amplifier in 208 single phase or 240 volts (Which is my preference). This can be easily found in its manual. My Crowns sit on 70/70 dual poles and never had an issue with the ODEAP coming into play once I gave the amplifiers the proper current feed. Since Crown stated (In the Service Manual) that the amplifier will disintegrate its slow blow German fuses at 80 amperes, it is safe to say, the amplifier is current limited around 35 amperes per power supply. So output power would be within the same range as the Crest 9001 and Crest 10.001 at 2 ohms per channel stereo mode. The QSC 9.0 was always in a different class than amplifiers mentioned above as it not only offered a high current capacity, it featured PFC. Best Regards, Edited by Elliot Thompson - 31 January 2018 at 10:12pm |
||||
|
Elliot Thompson
|
||||
|
||||
|
logsquared1
Registered User
Joined: 09 February 2017 Location: USA Status: Offline Points: 115 |
Post Options
Thanks(1)
Quote Reply
Posted: 31 January 2018 at 11:02pm |
|||
|
Sorry, a lot of what you said is not quite right.
Rails and max voltage swing are going to be very close to the same. Voltage rails on non regulated supplies will sag under high current demand, and hence reduce available output voltage.
That's not right at all. It's not how these amps work. They have a multi tiered power supply. Its the voltage demand at the output that determines what rail the output transistors "see". The crown can be set to "lock low" for low z operation. This keeps the rails from switching to high voltage. This is not available on the crest. Not sure if the 9.0 has this feature.
Lots of numbers here, but also incorrect. I'm not going to get into how the amps current limit. I can guarantee a 9001 will clip on the high rail with 2 ohm load.
This seem extremely wasteful. Im not sure why you would do that? At 240v a 20 amp circuit should service a ma5000 no problem. Your saying you run 4awg wire to this one amp? Its really borderline unsafe. As the lead wire guage on the amp is too thin to support a 70a fault (as far as the NEC is concerned). Edited by logsquared1 - 31 January 2018 at 11:03pm |
||||
|
||||
|
nuclearbass
Old Croc
Joined: 06 May 2010 Location: Rotherham Status: Offline Points: 9050 |
Post Options
Thanks(0)
Quote Reply
Posted: 01 February 2018 at 8:33am |
|||
|
Wow some one doesn’t like Elliot 😂😂
|
||||
|
one life - have fun!
Force fusion pro audio |
||||
|
||||
|
Post Reply
|
Page <12345 6> |
| Tweet |
| Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |
Topic Options
bcs wrote: