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Gemini GX-250, amplified speaker has power but no output

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dunnbiker
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SOURCE: Amplifier Power & Speakers

It's a common misconception that a high-powered amplifier will hurt a speaker when the opposite is more true.

Power ratings are specified within certain parameters at or below certain distortion levels. The problem with UNDER-powered amplifiers is that when they reach for the loudness beyond their clean capabilities they get really dirty and start to distort their output. Distortion will kill even a good speaker faster than a loud clean signal will. Stronger amps run more within their comfort zones and rarely strain for more than brief periods.

In no case should you ever try to do like Spinal Tap in their Mockumentary and turn the volume to '11'. ;-)

The HK's are fine. Speakers are a matter of (mostly) personal preference while amps running within their design limitation don't really sound different so go try out some speakers, see if they'll let you audition them at home and have some fun.

Posted on Apr 28, 2009

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How can I hook up my jvc rx-6018v to a gemini xga-2000 amplifier?


you can do it a couple of different ways, depending on what you're trying to do with your set-up.if you're trying to do something different than what I describe here, add a comment.
for independent volume control (each unit contols volume to a set of speakers independent of each other) use the rca 'tape' out of the jvc into the rca inputs on the back of the gemini.this puts a stereo signal from the jvc to the gemini. if you want your gemini to power your subs, get an rca y-splitter (single female to double male) and a single rca cable, hook single rca cable to sub out of jvc, connect y-splitter to gemini rca inputs, and single rca to y-splitter.

Mar 05, 2013 | JVC RX-6018V Receiver

1 Answer

Pioneer vsx 515 overload and shuts down what can i do to fix this problem.


hi,
First of all remove all the speaker connections from the amplifier. After that power the amplifier and check the overload (protect) show or not . if not, then any of the speaker is damaged or you have to check the impedence of your receiver and speakers. It will be written on the rear side of both receiver and speakers in ohms. PIONEER recommend to connect 8 ohms speakers in to this AV receiver. If you are using 6 ohms speakers you have to do some setting in the AV receiver.For that do the following

1. With the receiver in standby, press STANDBY/ON while holding down the SPEAKER IMPEDANCE button.( Each time you do this, you switch between the impedance settings: )


SP 6 OHM - Use this setting if your speakers are rated at 6 Ohms

SP 8 OHM - Use this setting if your speakers are rated at 8 Ohms or more


You are not able to connect speakers with impedence bellow 6 Ohms with this receiver. Becuse the AV receivers impedence range is 6 - 16 Ohms.
If then also it shows protect you have to check the amplifiers hardware.

AV receivers shows protect mode , when there is a hardware fault in side it. Its a warning that some thing is wrong.
Normally AV receivers show this when any of the output amplifier get some problem. there are six amplifiers in this AV receiver. May occur when the output diver transistors of any of the amplifier become shorted. if the output transistor get shorted this will lead to flow of current through the speakers. To prevent this there is a protection circuit for each channels. One combined output of this protection circuit is connected to the system control. when the any of the output amplifier fails, the protection circuit detects it and switch of the speaker and sent data to the system control. when the system control get this data it will give a warning to the customer through display that PROTECT.
You have to check the amplifier.
for that you need digital multimeter,soledring iron screwdrivers etc
open the amplifier , then power it on. connect the negative terminal of the multimeter any where in the chase( metal body of the amplifer). then connect the positive terminal to all the output transistors emitter pin one by one . the voltage should be bellow 0.5V. If any of the emitter of the transistor shows voltage more than 0.5V., then that amplifier stage is faulty. Remove the transistors and check it. if it is shot then replace with a new one.
after replacing the transistors do not power up the amplifier directly from the main. You have to put a bulb of 60 watts in serial.
You can do this easily remove the mains fuse. put the bulb in a holder. now you have to wire from the holder. connect one of it to the one end of the fuse holder and the other wire to the other end of the fuse holder. Why using a bulb is, if there is any further problem in the amplifier stage on which the transistors replaced, there is a possibility of the new transistor get damage. if we use a bulb in serial with its mains supply ,when any overload in the amplifier occur the bulb will drop the current, by lighting itself.
After connecting the bulb in serious power on the amplifier. watch the bulb. It should light for one or two second and go dim . if so check the display, is there is protect mode is on or not . if not and come back to normal operation ,then remove the power , remove the bulb insert fuse and check
connect the power and check.
If the bulb shows bright light then there is some component also faulty in the same amplifier. after removing the power you have to check again the amplifier stage of which the transistor is replaced, for any other faulty components.
ok

Jul 27, 2011 | Pioneer VSX-515 Receiver

1 Answer

Our receiver automatically shuts down, showing 'protect' in the display, when volume is turned up to -30 db. How can we stop/reset this? We really appreciate your answer.


hi,
First of all remove all the speaker connections from the amplifier. After that power the amplifier and check the protect show or not . if not, then any of the speaker is damaged. If its goes to protection mode when you incrase the volume then check the impedance of your speakers it should be 4ohms or above . Test with some other speakers if available.

Amplifiers gose protect mode , when there is a hardware fault in side it. Its a warning that some thing is wrong.
Normally amplifiers show this when any of the output amplifier have some problem. there are two amplifiers stage left and right . May occur when the output diver transistors of any of the amplifier become shorted. if the output transistor get shorted this will lead to flow of current through the speakers. To prevent this there is a protection circuit for each channels. One combined output of this protection circuit is connected to the system control. when the any of the output amplifier fails, the protection circuit detects it and switch of the speaker and sent data to the system control. when the system control get this data it will give a warning to the customer through display that PROTECT.
You have to check the amplifier.
For that you need digital multimeter,soledring iron screwdrivers etc
Open the amplifier , then power it on. Connect the negative terminal of the multimeter any where in the chase( metal body of the amplifer). Then connect the positive terminal to all the output transistors emitter pin one by one . The voltage should be bellow 0.5V. If any of the emitter of the transistor shows voltage more than +/- 0.5V., then that amplifier stage is faulty. Remove the transistors and check it. if it is shot then replace with a new one.
After replacing the transistors do not power up the amplifier directly from the main. You have to put a bulb of 60 watts in serial.
You can do this easily remove the mains fuse. Put the bulb in a holder. Now you have two wire from the holder. connect one of it to the one end of the fuse holder and the other wire to the other end of the fuse holder. Why using a bulb is, if there is any further problem in the amplifier stage on which the transistors replaced, there is a possibility of the new transistor get damage. if we use a bulb in serial with its mains supply ,when any overload in the amplifier occur the bulb will drop the current, by lighting itself.
After connecting the bulb in serious power on the amplifier. watch the bulb. It should light for one or two second and go dim ,then remove the power , remove the bulb insert fuse and connect the power and check.
(If the bulb shows bright light then there is some component also faulty in the same amplifier. after removing the power you have to check again the amplifier stage of which the transistor is replaced, for any other faulty components.
ok

Jun 13, 2011 | Marantz SR4021

1 Answer

MY MHC-GNZ7D MUSIC SYSTEM ONLY SHIWING PLEASE WAIT , ITS NOT WORKING PLEASEGIVE ME SUJETION


One possibility is that the power-on speaker protection delay is stuck on. The most common cause of this is a shorted transistor in one of the power amplifier channels. In that case, you will need to replace the speaker driver transistors in that channel. I don't have service information on your particular model; it may use power amplifier modules rather than individual transistors.

The tricky part is identifying the amplifier power and speaker output terminals to test for this problem. To find a shorted output transistor, you need to measure the resistance between the output of each channel and the plus, then the minus power supply connections. There is a relay between the amplifier output and each speaker terminal on the back; this relay is turned off by the speaker protection circuit, so you can't measure from the speaker terminals. If you have a fried transistor, one of the tests will show a resistance of a fraction of an ohm. A good transistor will have a very high resistance or read open. This will be the case whether you have modular amplifiers or discrete transistors.

If you see a blown fuse, that is a strong indication that you do have a fried transistor. Sometimes the speaker protector circuit shuts down fast enough to save the fuse, but not always.

Apr 27, 2011 | Sony Audio & Video Receivers

1 Answer

Where on my mixer should I plug the subwoofer into? Or would plugging it in somewhere else be better ?


This will depend on whether your sub-woofer is powered (has it's own built in amplifier) or not. If it is not powered it will need connecting to an amplifier. If it is powered you will need a line level output either on the amp or the mixer.
Many modern amplifiers (and some mixers) have a dedicated output for sub-woofers in which case this is the best place for it because the higher frequencies will have been filtered out.
Some high quality amplifiers like the JAMO MPA 101 have a filter switch and adjustable filter level for powering sub-woofers. You then just connect the speaker to the speaker terminals in the normal way.

Otherwise on a p.a. mixer you could use the main output, one of the auxiliary, monitor or sub-mix outputs. If you are not using the main output you will need to route signal to the appropriate output accordingly. Either way your output signal will cover the full frequency range - your subwoofer may have built in filtering or you may need to use some sort of crossover to split the signal between the sub-woofer and the rest of your speaker system.

Feb 25, 2011 | Audio & Video Receivers

1 Answer

How to connect my phillip cd player to speakers


It depends on whether the player has an Audio output because only then you will be able to connect the output to a speaker .
However if there is only an audio output - composite signal- then you will need a power amplifier to connect the speakers while the CD player is coupled to the power amplifier.

Feb 05, 2011 | Philips Audio & Video Receivers

1 Answer

Amplifier Power & Speakers


It's a common misconception that a high-powered amplifier will hurt a speaker when the opposite is more true.

Power ratings are specified within certain parameters at or below certain distortion levels. The problem with UNDER-powered amplifiers is that when they reach for the loudness beyond their clean capabilities they get really dirty and start to distort their output. Distortion will kill even a good speaker faster than a loud clean signal will. Stronger amps run more within their comfort zones and rarely strain for more than brief periods.

In no case should you ever try to do like Spinal Tap in their Mockumentary and turn the volume to '11'. ;-)

The HK's are fine. Speakers are a matter of (mostly) personal preference while amps running within their design limitation don't really sound different so go try out some speakers, see if they'll let you audition them at home and have some fun.

Apr 27, 2009 | Audio & Video Receivers

1 Answer

Speaker wire for subwoofer


Usually, a subwoofer will have its own built-in power amplifier. Thus, it will be designed to plug into a standard RCA jack (the type used for DVD players, etc). rather than having wires to connect to a speaker terminal block. Look for a jack on the back of the receiver called "Subwoofer", or simply "SW". If your subwoofer has 2 single wires, it WON'T work with your reveiver's subwoofer output, as this output only carries a line-level signal and is not amplified. You would need a separate power amplifier for this type of SW. If your SW speaker has a DVD-type plug, it should work fine with the receiver's SW output jack.

Jan 02, 2009 | JVC RX-554V Receiver

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