Power Requirements and Amp-Driving Characteristics Popular

C&C Box V2 FAQs

What are the technical features and specification for the C&C BOX?

Features and technical specification, in summary, are as follows:

Frequency response: 10-100KHz/1dB
THD+N: below 0.005%
Output power: 150mW + 150mW
Headphone matching: 8 ohm - 300 ohm

What is the gain setting for the C&C Box? Can I set the gain?

C&C BOX is designed to match headphones in a wide range of impedance. No matter whether you are using low impedance earphones of 32 Ohms or lower, or headphones of high impedance up to 300 Ohms, C&C BOX can perfectly match them while keeping output signal at its maximum accuracy. Thus gain setting is not necessary.

Power Requirements and Amp-Driving Characteristics Popular Headphones, Earphones, and IEMs
(prepared by C&C Studio Lab)

Manufacturer	Model	Impedance (Ω)	Sensitivity	Normalized sensitivity (dB/mW)	Avg power required (mW)	Avg power reserve required (mW)	Max power reserve required (mW)	Max Voltage swing (Vp-p)	Max current required (mA)
Alessandro	M1	32	100	100	0.316	3.2	9.5	1.6	17.2
AKG	K1000	120	74	74	125.9	1259	3777	60.2	177
	K141	55	101	101	0.251	2.5	7.5	1.8	11.7
	K141S	55	101	101	0.251	2.5	7.5	1.8	11.7
	K171	55	94	94	1.259	12.6	37.8	4.1	26.2
	K240DF	600	88	88	5.012	50.1	150.4	26.9	15.8
	K240M	600	88	88	5.012	50.1	150.4	26.9	15.8
	K240S	55	91	91	2.512	25.1	75.4	5.8	37.0
	K24P	32	125/1V	110	0.032	1.0	3.0	0.9	9.7
	K26P	32	125/1V	110	0.032	1.0	3.0	0.9	9.7
	K271S	55	91	91	2.512	25.1	75.4	5.8	37.0
	K301	120	94	94	1.259	12.6	37.8	6.0	17.7
	K301XTRA	55	102/1V	89	3.981	39.8	119.4	7.2	46.6
	K401	120	94	94	1.259	12.6	37.8	6.0	17.7
	K501	120	94	94	1.259	12.6	37.8	6.0	17.7
	K55	32	96	96	0.794	7.9	23.8	2.5	27.3
	K601	120	101/1V	92	1.995	20.0	59.9	7.6	22.3
	K66	32	96	96	0.794	7.9	23.8	2.5	27.3
	K701	62	105/V	93	1.585	15.8	47.5	4.9	27.7
	K71	100	105	105	0.100	1.0	3.0	1.5	5.5
audio-technica	A250	60	98	98	0.501	5.0	15.0	2.7	15.8
	ATH-A1000	40	103	103	0.158	1.6	4.8	1.2	10.9
	ATH-A700	64	102	102	0.200	2.0	6.0	1.8	9.7
	ATH-A900	48	101	101	0.251	2.5	7.5	1.7	12.5
	ATH-AD700	32	98	98	0.501	5.0	15.0	2.0	21.7
	ATH-CM7	16	100	100	0.316	3.2	9.5	1.1	24.4
	ATH-EM7	32	109	109	0.040	1.0	3.0	0.9	9.7
	ATH-EW9	29	105	105	0.100	1.0	3.0	0.8	10.2
	ATH-L3000	48	104	104	0.126	1.3	3.8	1.2	8.9
	ATH-W100	48	100	100	0.316	3.2	9.5	1.9	14.1
	ATH-W1000	40	100	100	0.316	3.2	9.5	1.7	15.4
Beyerdynamic	DT231	32	95	95	1.000	10.0	30.0	2.8	30.6
	DT831	250	96	96	0.794	7.9	23.8	6.9	9.8
	DT860	32	97	97	0.631	6.3	18.9	2.2	24.3
	DT880	250	96	96	0.794	7.9	23.8	6.9	9.8
	DT931	250	96	96	0.794	7.9	23.8	6.9	9.8
	DT990	250	96	96	0.794	7.9	23.8	6.9	9.8
	DTX800	32	105	105	0.100	1.0	3.0	0.9	9.7
	DTX900	32	108	108	0.050	1.0	3.0	0.9	9.7
Etymotic	er4p	27	108/.2V	106	0.079	1.0	3.0	0.8	10.5
	er4s/b	100	108/.79V	100	0.316	3.2	9.5	2.8	9.7
	er6	48	108/.4V	102	0.200	2.0	6.0	1.5	11.2
	er6i	16	108/.1V	110	0.032	1.0	3.0	0.6	13.7
Grado	RS1	32	98	98	0.501	5.0	15.0	2.0	21.7
	SR325	32	98	98	0.501	5.0	15.0	2.0	21.7
	SR80	32	98	98	0.501	5.0	15.0	2.0	21.7
	SRl25	32	98	98	0.501	5.0	15.0	2.0	21.7
KOSS	KSC35	60	101	101	0.251	2.5	7.5	1.9	11.2
	PortaPro	60	101	101	0.251	2.5	7.5	1.9	11.2
	SportaPro	60	103	103	0.158	1.6	4.8	1.5	8.9
Sennheiser	H260	17	96	96	0.794	7.9	23.8	1.8	37.4
	HD200	64	106/1V	94	1.259	12.6	37.8	4.4	24.3
	HD201	24	108/1V	92	1.995	20.0	59.9	3.4	49.9
	HD202	32	115/1V	100	0.316	3.2	9.5	1.6	17.2
	HD212Pro	32	112/1V	97	0.631	6.3	18.9	2.2	24.3
	HD215	32	112/1V	97	0.631	6.3	18.9	2.2	24.3
	HD25SP	85	100	100	0.316	3.2	9.5	2.5	10.6
	HD270	64	106/1V	94	1.259	12.6	37.8	4.4	24.3
	HD280Pro	64	113/1V	101	0.251	2.5	7.5	2.0	10.9
	HD330	150	101	101	0.251	2.5	7.5	3.0	7.1
	HD437	32	115/1V	100	0.316	3.2	9.5	1.6	17.2
	HD457	32	114/1V	99	0.398	4.0	11.9	1.7	19.3
	HD465	32	110/1V	95	1.000	10.0	30.0	2.8	30.6
	HD477	32	109/1V	94	1.259	12.6	37.8	3.1	34.4
	HD485	32	110/1V	95	1.000	10.0	30.0	2.8	30.6
	HD497	32	112/1V	97	0.631	6.3	18.9	2.2	24.3
	HD500	32	105/1V	90	3.162	31.6	94.9	4.9	54.4
	HD515	120	104/1V	95	1.000	10.0	30.0	5.4	15.8
	HD555	120	103/1V	94	1.259	12.6	37.8	6.0	17.7
	HD570	64	102/1V	90	3.162	31.6	94.9	7.0	38.5
	HD580	300	97	97	0.631	6.3	18.9	6.7	7.9
	HD590	120	97	97	0.631	6.3	18.9	4.3	12.6
	HD595	50	112/1V	99	0.398	4.0	11.9	2.2	15.5
	HD595	120	104/1V	95	1.000	10.0	30.0	5.4	15.8
	HD600	300	97	97	0.631	6.3	18.9	6.7	7.9
	HD650	300	l03/1V	98	0.501	5.0	15.0	6.0	7.1
	MX500	32	119/.5V	110	0.032	1.0	3.0	0.9	9.7
	MX550	16	123/V	105	0.100	1.0	3.0	0.6	13.7
	PX100	32	114/1V	99	0.398	4.0	11.9	1.7	19.3
	PX200	32	115/1V	100	0.316	3.2	9.5	1.6	17.2
Shure	E2c	16	105	105	0.100	1.0	3.0	0.6	13.7
	E3c	29	113.5	113.5	0.014	1.0	3.0	0.8	10.2
	E4c	29	109	110	0.032	1.0	3.0	0.8	10.2
	E5c	110	122	122	0.002	1.0	3.0	1.6	5.2
Sony	E888	16	108	108	0.050	1.0	3.0	0.6	13.7
Sony	SA5000	70	102	102	0.200	2.0	6.0	1.8	9.2
Westone	UM2	27	119	119	0.004	1.0	3.0	0.8	10.5

How long is the play time of the C&C BOX?

The play time is up to 70 hours.

What chips the C&C BOX is using?

C&C BOX uses 2 x AD822BR high precision low power FET-input Op Amp for amplification. With these high performance Op Amps, C&C box is able to deliver up to 150mW per channel, offering rich music details as well as very high dynamic range.

What battery the C&C BOX is using?

C&C BOX uses a built-in 4.8V 750mA NIMH rechargable battery.

How to tell the battery level of my C&C BOX?

The green LED indicates the battery level. If it starts dimming, you should recharge your C&C BOX.

Can I leave my C&C BOX charging overnight?

Yes, C&C BOX has build-in intelligent charger circuit. It will automatically stop charging once the battery is fully charged.

What is the input voltage of the charger?

The charger is 100-240V, auto switching.

What are the improvements of V2 over V1?

There are two major technical improvements of V2 over V1. First, the channel separation has become higher, and second, the noise floor has become much lower making the V2 much better for today's new headphones, which often have low impedance and high sensitivity. Other improvements includes more efficient charging circuit, higher resistance to external interference ( e.g. against cellphones) and a new higher quality and better looking casing.

apperance comparison between C&C Box v1 and v2

What if I hear distortion from my C&C BOX?

First, you should check the battery level and recharge your C&C BOX if necessary. If you are connecting the C&C BOX to an audio source that is of high signal power ( e.g. desktop CD player), keep the signal power output low. Keep in mind that C&C BOX is designed and optimized for low signal power audio sources (e.g. mp3 player, portable CD player). Connecting C&C BOX to a very high signal power source may damage the C&C BOX and your headphones.

Where should I send my C&C Box for maintenance or upgrade?

We have DUAL service centers. Co-located with our headquarters, one service center is in the US (PA), and the other in Hong Kong, for the convenience of our worldwide customers. For US and Canada customers, you may have our services at the US center. For other worldwide customers, you may have our services at the Hong Kong center. Please contact our customer support for the location of our service centers.

What if I have further questions?

We would be happy to answer your questions, please contact us.