Posts Tagged ‘power amplifier’

Delta Audio P6002 power amplifier

03/07/2018 Leave a comment

I said in a previous post that Delta Audio is a very popular brand in Singapore when it comes to budget professional audio. I saw this amplifier on Carousell and I was wondering what are the specs of this power amplifier. Unfortunately, I searched the Internet and I could not find any information whatsoever. I have these very same amplifiers installed in some bars and pubs, been seem them used by audio companies in roadshows and I have even seen them being used in dinner and dance events. I have heard that they last a long time but are damn heavy. Well, amplifiers that have a big-ass toroidal transformer inside them would be I suppose. In any case, this amplifier was being sold along with some speakers and flight cases for a couple of thousand bucks. In my opinion, it is not really worth it. I personally would rather get a good quality amplifier to drive my speakers. You do not want the heart of your sound-system stopping just like that (especially in the middle of an event) now do you?


QSC GX7 power amplifier

17/05/2017 Leave a comment

I was using this for an event some time last year. I remember that the event was a success and the sound was loud and punchy. It was partly credited to this lovely QSC GX7 amplifier that were powering the two main speakers. Now in the past, I have never been an advocate, of sorts, to these QSC GX series amplifiers but I am a convert now. I have installed these amplifiers in a couple of places and I can safely say that these amplifiers can really push their power well and handle their jobs with ease. This GX7 for instance. Both channels driven, it can put out 725 watts of power into 8 ohms. Into 4 ohms, it can put out 1000 watts. Not too bad really. As for connectors, there are XLR, 1/4″ TRS for balanced connections, and phono for unbalanced connections. Features-wise? Here you go:

  • Power levels matched to the most popular speakers used by entertainers
  • Optimized for maximum real-world headroom into 4- and 8-ohm speaker systems
  • Inputs: XLR, 1/4″ TRS and phono input connectors for compatibility with any source
  • Outputs: Speakon® combo accepts 1/4″ (TS) plugs or Speakon 2- and 4-pole plugs (connects 2 poles only). Binding posts support all other speaker wiring systems
  • Minimum depth chassis (10.1″ / 257 mm) fits in compact, inexpensive effects racks
  • Lightweight – GX3 and GX5 less than 26 lb (12.5 kg). GX7 only 15.5 lb (7 kg)*
  • Detented gain controls for precise setting and matching of sensitivity
  • GuardRail™ automatically protects the amplifier and loudspeakers from damage due to temperature rise or overdrive without shutting down the show
  • Front panel LEDs monitor power, signal, and clipping
  • Subwoofer/satellite crossover built-in

I am still used to the Yamaha amplifiers that I have used for many installs and even Yamaha have come out with some good ones recently. But given the fact that these from QSC are really good, it has been making me think twice about which amp I should be getting.

Categories: etcetera Tags: , , ,

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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Kramer 907 power amplifier

28/11/2016 Leave a comment

The Kramer 907 is a Class D power amplifier for line-level stereo audio signals. It accepts a balanced stereo audio signal on a terminal block connector. It delivers 150 watts per channel of music output to the speakers. I was testing out this Kramer 907 tiny power amplifier the other day and what can I say, this bloody thing can really pump some serious wattage! The following is a description of the features:

• Input and output on terminal block connections
• A volume control knob
• Gain control DIP-switches
• A mute button
• 24V DC power

I must say that power amplifiers like these are really useful for small applications such as powering a pair of small, outdoor speakers at say, a client’s restaurant or maybe even some small front speakers in a board room. very useful and small and I bet it does not cost half the earth. I also like the fact that it uses Phoenix connectors, hence the small footprint.

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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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NEXO NXAMP4X1 power amplifier

16/07/2015 1 comment

I have been planning to get a pair of new NEXO PS15-R2s but I was deciding whether or not to get this amp. The beautiful thing about this amp is that it has the power amplifier and controller all in one package. But this thing ain;t cheap. Some list prices I saw online price it at close to $5000! But then again, it is a darn sight cheaper than the Lab Gruppens whose equivalent to this amplifier would cost twice as much

On Yamaha’s web site (NEXO is a Yamaha subsidiary) for its commercial audio systems, I found some information about this amplifier, in fact, the whole NXAMP line. This is the smaller brother  of the bigger NXAMP4X4. This is how Yamaha describes it:

NXAMP is the complete integration of newly-developed high capability DSP processor and state-of-the-art power amplifier technology. NXAMP has higher DSP capability than NX242 and is compatible with all NEXO speakers. NXAMP monitors power voltage and currency of amplifier outputs, drives the whole system safely and maximizes speaker capability. NXAMP also adopts “EEEngine”, a high-efficiency amplifier method by Yamaha, and produces Class AB sound quality with high efficiency comparable to Class D amplifiers. Furthermore, NXAMP boasts overwhelming stability and high reliability implementing an independent power supply unit for each channel (4 channels total).

Quite a mouthful eh? But looking at the NXAMP4X1, it is able to put out 1300 watts @ 2 ohms, 900 watts per channel into 4 ohms and 600 watts per channel into 8 ohms. There are 4 channels as mentioned previously so that is pretty hefty. But this thing is pretty light…only about 16 kilograms.

So if I want to get a pair of PS15-R2s, it is gonna cost me about $3000 per speaker, making it $6000, plus one NXAMP4X1, bringing it to $11,000 just for the sound system. Egads. That is some serious cash but then again, as it is said, you only let your wallet cry once and after that, all should be OK. So decisions have to be made…..

BMB power amplifier

22/06/2015 Leave a comment

Everytime I see a karaoke setup and if there is a power amplifier like this installed, I know the owner is in good hands. The reason I think so is this. In 1994, I was contracted to install a karaoke room in a hotel in Batam Indonesia. In any case, the electrician that set up the place did not set it up properly wiring-wise and the whole place caught fire. Luckily the place was installed with water sprinklers and the next morning, we were told about the fire. We rushed to the hotel to check the damage. All the audio equipment was ruined…or so we thought. While clearing away the equipment, I saw that this amplifier was charred on the outside and the knobs and power switches were melted. I replaced the knobs, opened the unit and dried the components and cleaned it out and would you believe it, it fired up perfectly!

There are some who are thinking…yeah…maybe this amplifier did not bear the brunt of the fire but let me assure you, it did. Its feet were melted, so were the knobs. And the front panel was charred. Also, water from the extinguishers ended up in the unit. But after some TLC, it worked. Good on you BMB!

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