เครื่องขยายเสียง LAB GRUPPEN C28:4 Power Amplifier
แอมป์ขยายเสียง LAB GRUPPEN C28:4, เป็นเพาเวอร์แอมป์แบบ 4 ชาแนล มีกำลังขับ 4×700 วัตต์ @ 4 Ohms, Lo-Z or Hi-Z (70 V / 100 V) – Selectable per channel, normal or bridged, Class TD® amplifier topology, Screw terminal output connectors
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฿121,000.00 ฿108,900.00
Description
LAB GRUPPEN C28:4 C Series 4-Channel Amplifier (4x700W)
แอมป์ขยายเสียง LAB GRUPPEN C28:4, เป็นเพาเวอร์แอมป์แบบ 4 ชาแนล มีกำลังขับ 4×700 วัตต์ @ 4 Ohms, Lo-Z or Hi-Z (70 V / 100 V) – Selectable per channel, normal or bridged, Class TD® amplifier topology, Screw terminal output connectors
The C 28:4 is one of two mid-power, four-channel amplifiers in the C Series family. Attractively packaged in a 2U chassis, it provides 4 × 700 W output into 4 ohm loads.
C Series amplifiers are uniquely capable of adapting to a wide variety of demanding load conditions. Each channel has an individually configurable Voltage Peak Limiter (VPL™), which allows the output to be optimized for any loudspeaker load – whether a single large subwoofer or a series of small 100/70 V loudspeakers. VPL works in combination with adjustable input gain to achieve maximum headroom regardless of input levels or output impedances.
Every C Series is ready for the NomadLink® network right out of the box. With NomadLink, key amplifier parameters are displayed via DeviceControl software, and remote control of channel mutes and power on/off is under network control.
Features:
- Unprecedented power density – Total output of 2800 W (4 ohms) in a 2U cabinet
- Four channels – All channels bridgeable for 2- or 3-channel configurations
- Lo-Z or Hi-Z (70 V / 100 V) – Selectable per channel, normal or bridged
- Patented Class TD® amplifier topology
- Voltage Peak Limiter (VPL) – Configurable per channel to optimize each output for connected loads
- Phoenix-type input connectors
- Screw terminal output connectors
- Comprehensive protection and warning – Excessive output current, DC, high temperature, very high frequency (VHF), short circuit, open load, mains fuse protection, and soft start
- Efficient and uniform Intercooler® cooling
- NomadLink® network ready
Specifications
| General | |
| Number of amplifier channels | 4 |
| Peak total output all channels driven | 2800 W |
| Peak output voltage per channel | 141 V |
| Max output current per channel | 12 Arms |
| Max output power (all channels driven) | |
| 16 ohms | 600 W |
| 8 ohms | 700 W |
| 4 ohms | 700 W |
| 2 ohms | 300 W |
| Hi-Z per ch. (all ch.’s driven): 70 Vrms / 100 V peak | 700 W |
| Max output power bridged | |
| 16 ohms | 1400 W |
| 8 ohms | 1200 W |
| 4 ohms | 600 W |
| 2 ohms | Not recommended 1 |
| Bridged per ch.: 140 Vrms / 200 V peak | 1400 W |
| Performance | |
| THD 20 Hz – 20 kHz at 1 W | <0.1% |
| THD at 1 kHz and 1 dB below clipping | <0.05% |
| Signal to Noise Ratio | >112 dBA |
| Channel separation (Crosstalk) at 1 kHz | >70 dB |
| Frequency response (1 W into 8 ohms) + 0 / -3 dB | 6.8 Hz – 34 kHz |
| Input impedance | 20 kOhm |
| Common Mode Rejection (CMR) | >50 dB, 20 Hz – 20 kHz |
| Output impedance @ 100 Hz | 30 mOhm |
| Gain, Sensitivity and Limiters | |
| VPL, selectable per ch 2 | 141, 118, 100, 85, 71, 59, 50, 42 V |
| VPL, when bridged 2 3 | 282, 236, 200, 170, 142, 118, 100, 84 V |
| Voltage Peak Limiter mode (per ch.) | Hard / Soft |
| Amplifier gain selectable (all channels) – rear-panel switches 3 | 23, 26, 29, 32, 35, 38, 41, 44 dB |
| Default gain | 35 dB |
| Level adjustment (per channel) | Front-panel potentiometer, 21 position detented from -inf to |
| Connectors and Buttons | |
| Input connectors (per ch.) | 3-pin Phoenix, electronically balanced |
| Output connectors (per ch.) | Barrier strip 2-pole screw terminals |
| Output bridge mode | A+B and/or C+D, inputs A and C are input source |
| NomadLink network | On board, 2 x RJ45 connectors IN and OUT |
| Intelligent fans (on/off) | Yes, depending on presence of output signal |
| Power | Individual switches on front panel |
| Cooling | Two fans, front-rear airflow, temperature controlled speed |
| Front-panel user interface | |
| Common | NomadLink Network; Power Average Limiter (PAL)5; Power on |
| Per channel | Signal present / High-impedance; -10 dB and -4 dB output signal;Voltage Peak Limiter (VPL); Current Peak Limiter (CPL): Very High Frequency (VHF); High temperature; Fault; Mute |
| Power | |
| Operating voltage, 230 V / 115 V nominal | 130-265 V / 65 -135 V 4 |
| Minimum power-up voltage, 230 V / 115 V | 171 V / 85 V |
| Power Average Limiter (PAL) 5 | Yes |
| Power Factor Correction (PFC) | No |
| Soft-start / Inrush Current Draw | Yes / max. 5 A |
| Mains connector | 230 V CE: 16 A, CEE7; 115 V ETL: 20 A / NEMA 5-20P; C16:4: 15A/NEMA 5-15P |
| Dimensions | |
| Dimensions | W: 483 mm (19”), H: 88 mm (2 U), D: 343 mm (13.5”) |
| Weight | |
| Weight | 12 kg (26.4 lbs) |
| Finish | |
| Finish | Black painted steel chassis with gray painted steel front |
| Approvals | |
| Approvals | CE, ANSI/UL 60065 (ETL), CSA C22.2 NO. 60065, FCC |
Notes:
- 1: Regarding n.r. (not recommended) notes: The amplifier will be fully operational in bridge-mode into 2 ohm and high impedance (Hi-Z) loads, but due to physical constraints in the construction, the max. output power will not be significantly higher than running individual channels and therefore this mode of operation is not recommended.
- 2: For sine waves, peak voltage output values translate to Vrms with the formula V/1.41 = Vrms. E.g. 100 V peak equals app. 70 Vrms. Hence, outputs can be set for high-impedance loads without requiring a transformer.
- 3: Automatic -6 dB gain compensation when bridging channels. Ch.’s A+B and/or C+D, can be bridged individually.
- 4: Separate 230 V or 115 V versions available. Not selectable on the amplifier.
- 5: PAL can reduce the maximum output power to keep the power supply operating safely, and/or to prevent excessive current draw tripping the mains breaker. Refer to Operation Manual.
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