Posts Tagged ‘QSC’

Mixer and speaker install in a client’s place

21/04/2017 Leave a comment

Just the other day, about two weeks ago, I did an install in a client’s office. They had opened a new office, adjacent to theirs, and thus they needed some speakers installed. The speakers they installed were the 70V line versions so we had to get an amplifier that could handle all those speakers. We settled on this monster QSC amplifier and hooked up all the old speakers as well as the new ones. We also installed a Yamaha MG10XU mixer and a Shure SLX4 microphone. After it all was finished, the client was very happy with the result and I can safely say that this equipment will give the client years of dependable service.

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QSC ISA500Ti Commercial Power Amplifier

09/04/2017 Leave a comment

Just yesterday, I installed one of these 70V line amplifiers in a customer’s place. It was a pretty straightforward install and I must say that the install went like a snap. I hooked this up to a few 70V line speakers and this amplifier powered them loud and clear. Only thing about this amplifier is that it is damn, bloody heavy. It should be with two huge toroidal transformers inside! I went to the QSC website to find out more about it and this is what I found out about it:

  • Low-impedance outputs plus isolated 25, 70, and 100 volt outputs for distributed audio systems
  • Rear panel gain controls for tamper resistance; 2-dB detents allow for quick and repeatable settings
  • XLR and detachable Euro-style input connectors
  • DataPort V2 for use with DPV2-compatible signal processing accessories (XC-3, SF-3, LF-3) and DSP-3/DSP-4 (with external power supply)
  • Independent defeatable clip limiters for reduced distortion
  • Selectable high-pass filters (50 Hz or 75 Hz) protect speakers and prevent speaker transformer saturation, with minimal effect on program material
  • Front panel indicators include power, signal, and clip
  • Covered barrier strip output connectors for safety agency compliance
  • Automatic on-demand variable-speed fan: quiet normal operation, with maximum cooling when needed
  • Rear-to-front air flow helps keep equipment racks cool
  • Stereo, bridge, or parallel operating modes
  • Comprehensive protection circuitry including DC, infrasonic, thermal overload, and short circuit protection
  • 3-year warranty plus optional 3-year extended service contract

I connected this amplifier to the Euro connectors and I was mighty pleased with the outcome. The Euro connectors make installation a breeze with the screw-in terminals. Forget about soldering XLR connectors!

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QSC CX108V 8-Channel 70V Power Amplifier

21/06/2016 Leave a comment

My client had two of these QSC CX108V 70V amplifiers conk out on them and they were duly sent for repair. Apparently there was a problem with the “housekeeping card” or whatever that is. So those offending electronic items were duly replaced and sent back after repair.

I have always been interested in QSC amplifiers. I can never forget when I had a pair of QSC MX2000 amplifiers 25 years ago in the club, doing a damn good job f powering some Turbosound loudspeakers. So I was equally in awe about these 8-channel units and this is what I found out about them after looking them up o the web:


  • 100 watts per channel at 70 volts
  • Compact size—only two rack spaces and 14″ deep for reduced rack space
  • Channel pairs bridgeable for maximum flexibility
  • Exclusive PowerLight switch-mode power supply technology for high performance and compact size
  • Active inrush limiting eliminates AC inrush current, removing the need for expensive power sequencers
  • Four HD15 DataPort connectors (one per channel pair) for Q-SYS networked control and monitoring
  • Custom integrated gain control security cover for tamper-proof installations
  • 1-dB recessed detented gain controls for fast and accurate settings
  • Detachable Euro-style input and output connectors
  • DIP switch control for clip limiters, high-pass filters, bridge mono and parallel operation
  • Selectable high-pass filters protect speakers and prevent speaker transformer saturation with minimal effect on program material (50 Hz or 75 Hz)
  • Comprehensive front panel indicators including signal, clip, bridge mono and parallel input LEDs
  • Fully protected—including DC, infrasonic and ultrasonic, thermal overload and short circuit protection
  • High-performance Class AB+B complementary bipolar output circuitry
  • Lightweight—only 21 pounds (9.5 kg) for easier racking and shipping

And lightweight is true indeed. Unlike QSC amplifiers of old, these seemed almost featherweight. After installing them, they did the job and sounded as great as ever. Gotta love these QSC amplifiers. They will be giving many more years of service with no more issues…I hope!


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QSC PowerLight 3 Series PL380 power amplifier

29/06/2013 Leave a comment

I am hearing a lot of positive things about this QSC amplifier. I am no stranger to QSC and their excellent amplifiers. I was spinning in a cub 20 years ago that had QSC MX-series amplifiers and those babies kicked serious butt. I used a QSC amplifier last year to do a sound check last year, powering a pair of huge subwoofers and the damn thing did not even blink when pushed. This is what QSC is famous for…great amplifiers that can take a beating and come back for more.  According to their website, about this PL380 power amplifier:

The PowerLight™ 3 Series is designed for the most demanding live audio users, whether in touring rigs or fixed installations. The most requested features of the PowerLight 2 series have been upgraded to deliver “the ultimate analog amplifier”, while the QSC Dataport ensures full compatibility with advanced digital processing and™. Three models range in power from 1250 watts to 4000 watts per channel at two ohms, all in two-rack space chassis that are only 15.6″ (40 cm) deep and 22 lbs (10 kg).

That explains a lot about what this amplifier can do. The PL380 is a Class D amplifier. I am no fan of Class D but I will make the exception for some, like the powered mixer driving my Yamaha Stagepas speakers. The specifications of this power amplifier series are as follows:

  • PowerLight switchmode power supply for highest efficiency and improved audio performance
  • Flow-thru air path and solid aluminum heat sinks for maximum cooling
  • DataPort supports remote computer control and/or external DSP-4 modules
  • Detented gain controls with 1 dB steps for precise calibration
  • Removable knobs with lock-out security plate to prevent unauthorized tampering
  • User defeatable clip limiters and selectable low-frequency filter per channel (3 Hz, 30 Hz, or 50 Hz)
  • Three selectable input gains (26 dB, 32 dB, or 1.2 V)
  • Front and rear panel LEDs indicate status of switch settings at a glance
  • Parallel Dataport, XLR/M and XLR/F connectors for simple loop-through connectivity
  • Neutrik Speakon® and “Touch Proof” binding post outputs
  • Neutrik Powercon® power cable remains secure on the road
  • 3 year warranty, plus optional 3 year extended service contract

The PL380 can deliver 1500 watts per channel into 8 ohms, 2500 watts per channel into 4 ohms and 4000 watts per channel into 2 ohms. Egads! Pretty good specifications but quality like this does not come cheap. But by and large, it is a great investment and I am pretty sure that you will be happpy with QSC, should you decide to invest in their power amplifier. I know I was convinced over 20 years ago.

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Sound reinforcement does not have to be complicated

01/10/2012 Leave a comment

It is fairly easy to get started in the sound reinforcement business. You can start off by having a small system and offer services to event companies, tradeshows and the like. A small system does not have to be expensive. Take a look at the picture above. All it consists of are two Peavey dual 15″ speakers, a small Mackie mixer, a QSC power amplifier and what looks like an effects unit. Rack it up in a standard road rack and there you go. What would be ideal here in this picture, and would be required in some case would be a CD player and a graphic equalizer. But all this stuff is not super expensive and will perform well. I should know about this because I started off this way and I am still doing it, on a much smaller scale.

QSC RMX 2450 power amplifier

19/07/2012 Leave a comment

I was using this amplifier a couple of days back to drive a pair of sub-woofers and as usual, the QSC power and quality was there. I have always liked QSC amplifiers. They get the job done without any issues at all and they do a good job. Stable and powerful, this amplifier was able to really thump those sub-woofers and give a full sound to the club. They were not one of those really heavy “boat anchor” amplifiers and was really easy to carry. This amplifier features:

  • Inputs (2) XLR, (2) ¼” TRS phone, and barrier strip
  • Outputs (2) binding posts, (4) NL4-MD Speakon jacks
  • Power 475W @ 8, 750W @ 4, and 1,200W @ 2 (per channel)
  • Frequency Range 20 Hz-20 kHz(+0/-1 dB, -3 dB @ 5 Hz and 50 kHz)
  • Noise 100 dB below rated output
  • Input Level 1.15V (+3.4 dBu) for full output
  • Dimensions 19″ (W) × 3.5″ (H) × 15.9″ (D)

For mobile audio, installed audio, this amplifier looks like a very strong contender

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QHA PLC-380 Power Amplifier

12/02/2012 Leave a comment

In my daily trawls of the Internet, I come across some really interesting stuff. This is another one of them. When I first saw it, I thought immediately that it was a QSC amplifier of old. It even uses the same alphabets in the model number i.e. PLC. This piqued my interest and I find out that it is manufactured (probably in China) for a New Zealand company named SNW Electronics. This company also seems to manufacture and sell motorbike parts. Maybe they are trying to do something what the Yamaha Corporation is doing, I just do not know. In any case, the specs of this amplifier are, as taken from their website:

Stereo Mode:

Both channel driven 8ohm : 1200W X 2
Both channel driven 4ohm : 1800W X 2
Both channel driven 2ohm : 2700W X 2


Bridge Mode 8 ohm : 3400W
Bridge Mode 4 ohm : 5200W
Friequency Response HZ: 20-20K
THD+N: 0.02%
S/N: 90dB
DIMENSIONS:480W x 465D x140H mm
Gross Weight (kg) :42

It costs about NZD$1200 and it looks like it is a pretty hefty amplifier, with a weight of 42 kilograms. I am not too sure how it performs as the specifications are merely words on paper. The specs look good from what I see but reliability-wise…I ain’t too sure.