The Ashly TRA-4150 is a 4-channel convection-cooled rackmount P.A. or installation power amplifier housed in a rugged 2-RU metal chassis, offering an output of 80 Watts per channel at 8 Ohms and designed to drive 4- and 8-Ohm loads and transformer-coupled 70V and 100V lines simultaneously. The coupling transformers are internally mounted.

The TRA-4150 incorporates a switch-mode-power supply and Class-D amplifier circuitry, providing a power-efficient solution. The low-noise unit features a switchable high-pass filter and selectable gain sensitivity, turn-on delay DIP switches with up to 8 seconds of delay available, and rear-mounted set-and-forget gain controls.

The TRA-4150 is equipped with an internally switchable 120/240V power supply and extensive protection circuitry, along with standard Euroblock inputs and screw terminal outputs.

70/100V Transformer, 4- and 8-Ohm Loads    150W per Channel at 4 Ohms    4-Channel Convection-Cooled Operation    80 Hz HPF, Selectable Gain Sensitivity    Front-Panel Indicators    Euroblock Input Connectors    Screw Terminal Outputs

2-RU rackmount 4-channel power amplifier with 80 Watts per channel power output at 8 Ohms and built-in 60W/70V transformer

Designed to simultaneously drive 4- or 8-Ohm loads and 70/100V transformer-coupled lines

2-stage high-efficiency switched-mode power supply with high power-to-weight ratio

Ultra-quiet convection-cooled operation

On-board 80 Hz HPF, selectable gain sensitivity

Up to 8 seconds of turn-on delay with selectable dip switch complement

Comprehensive amplifier protection circuitry includes: output over-current, DC output, main supply rail over-voltage, chassis temperature, inrush limiting, and mains fuse

Front-panel indicators include: overall power, standby, and protect—along with per-channel clip and signal indicators

Euroblock input connectors, screw terminal outputs

Related Questions and Answers

Q: 1. Is this a USA version or Import ? Maybe it says, but I could not see it. Thank you.

A: This MB-D12 battery grip is meant for sale in the USA. It will be covered by Nikon's 1 year limited warranty against defects.

Q: 2. Is there any kind of indicator showing levels of the battery / batteries in the grip?

A: Yes, the camera shows battery levels in grip and or camera body.

Q: 3. Someone suggested to me that there is a way to charge the batteries while in the grip, thereby avoiding the necessity of purchasing the expensive charger. Is that true? If so, does the charging cord come with the grip, or must we buy that separately?

A: Battery must be removed from the grip and recharged with a separate battery charger. There is no provision for charging the battery while its in the grip. If using a EN-EL18, you will need to buy a charger for it.

Q: 4. What is on the underside of the battery pack? Still able to mount on my tripod or is it only usable as handheld?

A: It can be mounted on your tripod and if you needs require an L-Bracket , that can be mounted as well.

Q: 5. Is the MB-D12 available as a Grey Market or Import item?

A: The MB-D12 is available as a Nikon USA item only.

Q: 6. Is everything included that I need in the box in able to use it except the batteries?

A: Yes, the Nikon MB-D18 Multi-Power Battery Pack has everything you would need to work excluding the batteries.

Q: 7. Is this battery made in China?

A: Yes. The country of origin for this SWIT HB-A290B 28.8V 290Wh/10,005mAh B-Mount Battery with Built-In LED Flashlight, would be the country of China.

Q: 8. Does the D850 EL-18 battery for the power grip work in the Z9?

A: Based on preliminary information released by Nikon, the Z9 will use EN-EL18 batteries, but a newer version (18d vs 18c). This likely means the newer battery has improvements but will take the older batteries as well.

Q: 9. I have seen the non-Nikon version of this grip with the D4 battery. The photographer said it works fine. Can this grip do the same?

A: You can use the EN-EL18 battery in the MB-12 battery grip. You would need the BL-15 Battery Chamber Cover (B&H # NIBL5), though, in order to use that battery in the MB-12.

Q: 10. What are the dimensions of the D850 with the MB-D18 battery pack attached?

A: 6-1/2 high (to the hot shoe) by 5-3/4 wide and 3 deep.