Question about Gem Sound GemSound PA-585 2-Channel Amplifier

1 Answer

Gem Sound clipping problem

I have a dj setup with Gem Sound amp EXA-3950 (3000 watts-1400 watts max peak per) with 2 Gem Sound TR-300's ( dual 15" woofers- one horn and 5 tweeters on each speaker --1000 watts peak?). we seem to have clipping problems quite frequently as we near 50% amp capacity--particularly in large gyms for school dances. the mixer we use is a Behringer 2 channel mixer with the gain about half way up. any assistance would be greatly appreciated. thanks!

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 4,234 Answers

First of all the EXA-3940 is rated at 350watts per channel in to 8 ohms. The 1400 watts is bridged into a 4 ohm load. Second, the speakers can handle 1000Wats peak with an average of 600 continuous (i'm guessing). That tells me that the amp is underpowered for the speakers. The sensitivity of the amp is such that the mixer is overdriving the input stage. That is what is causing the clipping. If you are looking for more volume, you are probably better off purchasing another amp and running them in bridge mode, 1 per speaker cab. Be careful though, not to overdrive the speaker cabinets either.

Dan

Posted on Sep 24, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

What is the speaker load impedence of the speakers


Looks like you can use minimum 2 ohms, max 16 ohms

LFC Impedance Sensing

CS Series amplifiers feature innovative circuitry for safe operation into any load. When an amplifier senses a load that

overstresses the output stage, the Load Fault Correction circuit adjusts the channel gain to a safe level. Extreme load

fault under high power levels will cause the signal to be muted for the associated channel. This method of outputstage

protection is far more effective than the standard limiting found on conventional power amplifiers. The LFC
circuit is sonically transparent in normal use and unobtrusive when activated.


Jun 20, 2014 | Peavey CS 1400 Amplifier

1 Answer

Gemsound pa 1005 exa keeps shutting off


I Think that something like a transistor is getting hot and then shutting down. Exploring inside might solve the problem of what's getting really hot. You could even get some Servisol Freeze Spray, and wait for it to go off then spray it on the suspected part. That will cool it down and it should start up again. If it does come on, that part will have to be replaced.

Jun 28, 2012 | Gem Sound GemSound PA-585 2-Channel...

1 Answer

How many watts per channel it show 150w on the back


There could be several answers to this question depending on where the figure 150w appears and what other information is with it.
If the figure is next to something like AC100v or 220v then this is the mains power consumption rating - there is no direct correlation to output power because it will depend on the other components in the system and how they are configured.
If it is on the output stage of the amplifier (where the loudspeakers connect) then it could be a either the total of all the channels added together or a per channel rating. If it is an output power it will normally also have the word "at" followed by another number and the symbol ω (or the word ohms). The actual output achieved will vary depending on the resistance of the loudspeakers (for example an amp rated at 150watts at 8 ohms would only be able to push about 75 watts into 16 ohms but 300 watts into 4 ohms)
Further the rated power could be quoted either in Peak output (also known as peak music power or pmp) or, alternatively it may have the letters RMS (Root Mean Square) which roughly equates to 300watts Peak.
Cheaper units tend to quote Peak outputs because it makes them look more powerful than they really are. RMS is generally the power output rating used by high quality equipment and professional musicians because it gives a better indication of general usable power.

Apr 01, 2011 | Amplifiers & Preamps

1 Answer

I need an owner's manuel for a Pioneer stereo power amp SPEC-4. I have a part # ARB-235. I think this amp is a product of the 1970's. Where would I be able to get my hands on the operating instructions?...


You can register with hifiengine.com andfind it and the service manual.

There really isn't a lot to a power amp to be operated. This one differs from most in that it has an input level control and VU meters.

From http://images.google.com/imgres?imgurl=http://www.incomesixdigits.com/spec4/spec4a.jpg&imgrefurl=http://www.incomesixdigits.com/spec4/&usg=__WbFLwPqHXjFHe_P2BCKyTT9CxQY=&h=652&w=1156&sz=526&hl=en&start=2&um=1&itbs=1&tbnid=5SVKh2leUGWXmM:&tbnh=85&tbnw=150&prev=/images%3Fq%3Dpioneer%2Bspec%2B4%26hl%3Den%26rlz%3D1R2ADFA_enUS360%26sa%3DX%26um%3D1


Dynamic 150 + 150 Watts Power Output, Generous High-power Design
The Spec-4 employs DC construction which excludes capacitors from the NFB circuits and uses a dual transistor differential amplifier with a current mirror circuit in the 1st stage. This provides a stable operation and also high gain over a wide frequency range. The pre-driver stage is a class A amplifier circuit with a regulated current circuit for the load. This makes for high-gain amplification with superior linearity. Furthermore, there is an overdrive limiter and power limiter circuit which is designed to protect the power transistors and make for added reliability.
The power stage employs a 3-stage Darlington pure complementary parallel SEPP circuit.
The SPEC-4 delivers Continuous Power Output of 150 watts per channel, min. RMS, at 8 ohms from 20 Hertz to 20,000 Hertz with no more than 0.01% total harmonic distortion.

Completely Independent and Perfectly Stable Left / Right Power Supplies
The mighty power supplies are completely separated for the left and right channels. Also, each channel is provided with two 22,000uF large-capacity electrolytic capacitors and large transistors with a superior regulation. They achieve outstanding channel separation and a clear, powerful reproduced sound, in addition to the wide frequency response. There is a built-in surge killer circuit to suppress inrush currents from the power transformers and high currents which charge the electrolytic capacitors. This circuit ensures that none of the parts are affected by these adverse currents.
Protective Circuits Composed of Fast-response Relays and Electronic Circuits
Each channel is protected by a DC and over current detection relay circuit. In the event of the speaker terminal shorting due to poor connections or when DC current is generated in the output, the output circuit is immediately disengaged and the speakers and transistors are safeguarded against any possible damage. The protective circuits also function as muting circuits when the power switch is turned on and off.
Peak Level Meters with Outstanding Waveform Response
This power amplifier incorporates logarithmic compression peak meters with a wide scale (-40 -+3dB). With 8-ohm speakers, they allow the output to be read out from 0.01W to 300W. Moreover, the meters feature a fast response for peak signal indication. In addition to the peak output reading, it is easy to interpret the dynamic margin with respect to the SPEC-4’s clipping level.
Input Level Controls with dB Calibration
The SPEC-4 is equipped with input level controls with direct readout attenuation values (-dB). These can be used to continuously adjust the input levels for each channel in accordance with the rated output voltage of the preamplifier. In this way, the SPEC-4 can perform the proper gain control according to the preamplifier’s output level. The preamplifier will thus be used in the condition possible for the best S-N ratio and distortion characteristics.
Stylishly Professional Front Panel Design
Just as you would expect from a sophisticated system, the SPEC-4’s front panel is professionally designed with the large level meters in the center. Also. The front panel’s dimensions allow the model to be mounted in an EIA standard rack, just like real professional-use amplifiers.
SPECIFICATIONS
ICs………………………………........................................2
Transistors………………………………...........................61
Diodes……………………………….................................62
Power Amplifier
Circuitry………………………………Current mirror loaded differential Amplifier
3 stage darlington parallel push-pull
Direct-coupled OCL. (DC amplifier construction)
Continuous Power Output of 150 watts * per channel, min. RMS, at 8 ohms from 20 Hertz to 20,000 Hertz with no more than 0.01% total harmonic distortion, or 180 watts per channel at 4 ohms from 20 Hertz to 20,000 Hertz with no more than 0.03% total harmonic distortion.
Total Harmonic Distortion (20 Hertz to 20,000 Hertz, 8 ohms)
Continuous rated power output………………………………................................0.01%
75 watts per channel power output……………………………….......................... 0.01%
1 watt per channel power output……………………………….............................0.01%
Intermodulation Distortion (50 Hertz to 7,000 Hertz = 4:1, 8 ohms)
Continuous rated power output………………………………................................0.01%
75 watts per channel power output……………………………….........................0.005%
1 watt per channel power output………………………………........................... 0.005%
Frequency Response………………………………...............5 Hertz to 100 kHertz +0/1 dB
Input (Sensitivity / impedance)……………………………............................1V/50k ohms
Output
Speaker……………………………….................................................4 ohms to 16 ohms
Damping Factor (20 Hertz to 20,000 Hertz, 8 ohms……………………………….........100
Hum and Noise (IHF, short circuited, A network………………………………........11 5dB
Miscellaneous
Power Requirements………………………………...................................AC 120V 60 Hertz
Power Consumption………………………………..........................................760 watts (UL)
Dimensions………………………………..............................480(W) x 187(H) x 445 (D)mm
18-7/8 x 7-3/8 x 17-7/16 in.

Feb 10, 2010 | Amplifiers & Preamps

1 Answer

You guys was helpful last time so I thought I would ask more!!!! DJ equipment Gem Sound amp EVA-3955 at 8ohms 2x250w blew 2 Tr-150 15'' 8ohms rated at 600w blew. what replacement should I go with same size...


Typically large speakers like that blow up because you are trying to put frequencies into them that they can not reproduce. How are these units connected? Is the crossover frequency correct for these 15" speakers? Putting signals higher than about 1000Hz will start to heat them up. too much heat = blow-up.

Also, I'm not familiar with the tr-150s. Is the 600W rating a PEAK rating or continuous?

Dan

Jan 06, 2010 | Amplifiers & Preamps

1 Answer

Amplification


You need to now the RMS for a true capacity of your speakers and your amp.

I would say you are OK, with a margin, but if you turn the amp to max and blow the speakers, please dont call me.

Sep 30, 2009 | Sunfire Cinema Grand Signature 400 seven...

2 Answers

Speaker linking


You know, watts is a heat dissipation unit... It tells nothing about your speaker, the usage you wanna do with it, and what about the amp! Usually on proffessionnal amplifier ( i mean touring power amp) we rely 2 speakers in parallel per side of amp. It turns the amp working at 4 ohms and ifs it pushed by a good amp, and a reasonnable operator, things goes find. If amp ''clip'' it sending DC in the speakers and you actually in the way of a repair. So its now having too much power amp that usually breaks speakers, but too small amp. Check the specifications of what your amp can gives at 20hz to 20khz, both channel driven at 4 ohms. You find out that the amp you believe was sending you 500watts is giving you only 250... Thats why pro series of amp cost so much. Because they are not playing on words but giving power... Cheap series of pro amp counts wattages at 4ohms one channel driven at 1khz at 1% distortions wich is unnaceptable. 0.1% is the max acceptables. Go meet the tech at your local big touring sound contractor and ask for the real thing. You'll get the right answer and analysis of your kit...

Aug 04, 2009 | Behringer EUROPOWER EP2500 Amplifier

1 Answer

Gem sound exa 3950 amp


Hi...
If it's a straight-up power switch then it will need to be replaced if it works off a relay then the relay is gone.

website

http://www.gemsound.com/contact.html#


Mar 24, 2009 | Gem Sound GemSound PA-585 2-Channel...

2 Answers

Gem sound 3950


Dc problem in amplifier (short circuit) needs to be serviced

Jan 05, 2009 | Gem Sound GemSound PA-585 2-Channel...

1 Answer

Gem sound amplifier #exa 1005


please disconnect your speaker from amp first-if fault goen connect your speaker one by one until you find the bad one-check the cable first and change it with new one and then change the speaker-if the fault still you will have a problem in your amp itself.

Jul 06, 2008 | Amplifiers & Preamps

Not finding what you are looking for?
Gem Sound GemSound PA-585 2-Channel Amplifier Logo

Related Topics:

392 people viewed this question

Ask a Question

Usually answered in minutes!

Top Gem Sound Amplifiers & Preamps Experts

 Grubhead
Grubhead

Level 3 Expert

4585 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

Dennis McCollum

Level 2 Expert

137 Answers

Are you a Gem Sound Amplifier and Preamp Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...