beginner44

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

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