beginner44

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About beginner44

  1. CTS 4200 - upgrade 110v -> 220v

    @dakos : thank you for your answer. I was told that most amplifiers are not sensible to the difference in the current frequency ? Can someone from the Crown team add some input ? By the way, happy Independance Day to all ! Many thanks in advance, BG44
  2. How many amps for this setup

    @ dakos : many thanks for your answer. I have an opportunity to buy a used CTs4200, I guess it would fit perfectly for my 4 surround speakers. Take care, BG44
  3. Hello everybody, I bought in the USA on ebay a CTS 4200. Unsurprisingly, it comes with a 110v input. The trouble is that i live in europe, so I need to convert 220v to 110v. What would be the best way to do so : - upgrade the internal power supply ? which part number ? where can I buy it ? - use an external converter ? What power sould it deliver : 200w ? 500w ? 1000W ? Many thanks in advance for your help, BG44
  4. Hi there, this is my first post here. I really need your help, as I'm a beginner in the audio gear worl ! I'm building my hometheater. The speakers are : LCR : JBL 3678 (so 3 pieces) Frequency range (-10 dB): 30 Hz to 20 kHz Frequency response (± 3 dB): 45 Hz to 12 kHz Power capacity1 (passive): 300 W Power capacity (bi-amp): HF: 50 W LF: 600 W Sensitivity: 98 dB Nominal impedance: 8 ohms Crossover Frequency: 1 kHz Nominal coverage: 90° horizontal, 90° vertical alf-space reference ef?ciency: 3.3% ximum acoustic power output (sine wave input) 8 acoustic watts Surround : JBL 8330A (4 pieces) Frequency Range (-10 dB): 40 Hz - 20 kHz Frequency Response (±3 dB): 70 Hz - 14 kHz Power Rating1 : 100 watts continuous pink noise, 400 watts peak Sensitivity2 : 91 dB SPL, 1W @ 1m (3.3 ft) Nominal Impedance: 8 ohms Hor. Coverage Angle (-6 dB): 110° averaged 400 Hz to 12 kHz Vert. Coverage Angle (-6 dB): 105° averaged 400 Hz to 12 kHz Directivity Factor (Q): 4.5 averaged 400 Hz to 12 kHz Directivity Index (DI): 6.5 dB averaged 400 Hz to 12 kHz Crossover Frequencies: 650 Hz, 3.1 kHz Subwoofer : JBL 4641 (1 piece) Rated Impedance: 8 ohms Minimum Impedance: 6.3 ohms NDLING CAPABILITY: ntinuous Pink Noise1 : 600 Watts Continuous Program2 : 1200 Watts Peak Power3 : 2400 Watts OUTPUT CAPABILITY: Axial Sensitivity4 : 50 Hz to 500 Hz; 98 dB, 1W @ 1m 40 Hz to 100 Hz; 97 dB, 1W @ 1m Power Compression5 : 10 dB power (60 W): 0.8 dB 3 dB power (300 W): 2.6 dB ated power (600 W): 4.3 dB Single Two Four Eight Module Modules Modules Modules Reference Ef?ciency6 : 2.9% 5.8% 8.7% 11.6% ontinuous Acoustical Power Output: 17 W 70 W 209 W 557 W uous SPL @ 1 meter7 : 125 dB 131 dB 136 dB 140 dB Peak SPL @ 1 meter7 : 131 dB 137 dB 142 dB 146 dB QUENCY RESPONSE8 : Lower Frequency Limits (no EQ): -10 dB: 25 Hz -3 dB: 35 Hz Lower Frequency Limits (with EQ): -10 dB: 22 Hz -3 dB: 25 Hz ossover Frequencies: High-pass: 20 Hz, 24 dB/octave or greater Low-pass: 80 Hz to 150 Hz, 12 dB/octave or greater Now the questions : 1 - I found the specs and users' feedback very positive on the CTs series, so I plan to use a bunch of them. Has anyone experience of these in such a context ? (my room is around 6300 pi3, 560 pi2) 2 - for the sub, I would use CTs2000 (2 * 1000 W) ; for Left & Right, CTs600. What about Center ? Can I use the spare channel on the CTs2000 ? 3 - for the surround, JBL documentation (JBL Cinema Sound Systemrecommends CTs1200 ; I do not undestand why CTs600 would not be appropriate (despite the lower sensitivity (91 db) of these speakers) ? 4 - can I plug the 4 surrounds on the same CTs1200 / CTs600 ? (I know I would not be able to define a different delay for each surround in that case) ? Or shoud I use 2 amps (1 per pair) ? I thank you very much in advance for your help, Best regards, B44