Crest CA18 & 9001 |
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levyte357
The 10,000 Points Club Joined: 10 May 2004 Location: UK, London Status: Offline Points: 11743 |
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Posted: 12 February 2009 at 1:08pm |
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Last time I looked at schematics, I "think" the 9001 also has 12x smoothing caps, but higher values, and "maybe" higher ripple current. Does the CA18 have same number of O/P transistors as 9001 ? |
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"Who am I? I'm the guy who does his job.. You must be the other guy".
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demanddeepbass
Young Croc Joined: 14 June 2006 Location: London Status: Offline Points: 516 |
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Yep, 18 and 9001 have same number and same type of OP devices.
I did a very quick tot up of farads: 75000uF in the 18 and 76000uF in the 9001: near as makes no difference. Didn't look at ripple figures. |
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"These amps go up to 11"
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levyte357
The 10,000 Points Club Joined: 10 May 2004 Location: UK, London Status: Offline Points: 11743 |
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@deepbass:I heard a rumour, that the CA18 current limiting in 2.66 ohm mode is not as restrictive as in 2 ohm mode, hence the amp can actually output over 2.5kw per channel in this mode? Does that seem possible to you? |
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Elliot Thompson
Old Croc Joined: 02 April 2004 Location: United States Status: Offline Points: 5172 |
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The Crest CA 18 offers a voltage rail of 99 Volts DC +/-
The Crest Professional Series 9001 offers a voltage rail of 114 Volts DC +/- These amplifiers are not the same. Best Regards, |
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Elliot Thompson
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chickenfizz
Young Croc Joined: 17 March 2008 Location: United Kingdom Status: Offline Points: 982 |
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My knowledge of class h and class g designs isn't great but I'm guessing ripple current would not be a factor in these designs? Please someone correct me if I'm wrong.
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demanddeepbass
Young Croc Joined: 14 June 2006 Location: London Status: Offline Points: 516 |
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The schematics show them both as having +- 120V are your figures measured voltages Elliot? I'll check the schematics in detail if I get time but the output stages look mighty similar....
It's possible that you might get more power at 2.66 that at 2 if there is indeed a current limiter but id need to sit down and do maths to check - no time right now I'm afraid. |
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"These amps go up to 11"
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Elliot Thompson
Old Croc Joined: 02 April 2004 Location: United States Status: Offline Points: 5172 |
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Both came directly from Crest's spec sheet. It is more than likely taking the load into account. In addition to the power supply sag for, the 9001 offers 65 Amps (120 Volt) while, the CA 18 will deliver 36 Amps (120 Volt) @ 4 ohms maximum. The CA 18's power supply is weaker than the 9001, which affects the overall performance. Without doing the calculations the CA 18 will meet it's specs while the 9001 will exceed it's published specs. Best Regards, Edited by Elliot Thompson - 12 February 2009 at 6:12pm |
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Elliot Thompson
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csg
Old Croc Joined: 17 September 2007 Location: bedford Status: Offline Points: 6086 |
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Having owned a few 9001's in the past, and having compared them directly to ca18's i can assure you there is a considerable difference in practice. the 9001 is considerably more powerful.
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levyte357
The 10,000 Points Club Joined: 10 May 2004 Location: UK, London Status: Offline Points: 11743 |
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Please correct me where I'm wrong, Assuming amp is 100% Efficient, which it isn't, How can 240(V) @ 18(A) * 1 (100% Efficiency) = 5000W ???? EDIT:Suggests values are not measured, but estimated ? Edited by levyte357 - 12 February 2009 at 8:05pm |
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"Who am I? I'm the guy who does his job.. You must be the other guy".
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TRE4U2NV
Old Croc Joined: 21 May 2005 Location: home Status: Offline Points: 2592 |
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ear 2 ear 9001 all day everyday
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IM SO SECRETIVE BUT I CANT TELL YOU WHY
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ceharden
The 10,000 Points Club Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11776 |
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A 9001 installed with no more than 4m of 10mm square cable back to the main 100A incomer to the building definitely brings a smile to my face every time!
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Elliot Thompson
Old Croc Joined: 02 April 2004 Location: United States Status: Offline Points: 5172 |
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Well I did say, I did not do the calculations. Right! 240 Volts @ 18 Amps = 4320 watts. Bare in mind the amperage stated is under 4 ohms stereo mode not, 2 ohms. Under a 2-ohm configuration the amperage will be greater so, it should achieve 5000 watts. 4320 watts versus 5000 watts yields a 0.6 dB gain. Whether 5000 or 4320 watts you will not hear a difference. Best Regards, |
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Elliot Thompson
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