Question about Zapco Reference 750 Car Audio Amplifier

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I have a zapco refrence 750.2 has no sound output when bridged but works fine when i run a speaker to each channel. any ideas on whats wrong?

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Check your settings on your stereo and the amp make sure you have changed to 1 ohm on the amlifier for a briged connection to a subwoofer and change from lpf to hpf on the amp there should be a switch.

Posted on Jun 08, 2010

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I installed a 400 watt zapco competition amp\ front speakers play ...back woofers don't?


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This really depends on the setup you intend to create in your vehicle.

The Amplifer (amp) needs to be matched to the speakers you intend to run.


As a rule of thumb, the power of the amp shouldn't exceed the max. power of the speaker (this may damage your speaker). Instead, the amp's RMS output power should be at 75-100% of the speaker's RATED (RMS) input power. NOTE: this must NOT be confused with max power.

Ideally, you want to run each speaker with its own amp channel.

A subwoofer will usually require a hi-power single channel amp, or a 2 channel amp, bridged into 1 (to increase power output required for the sub).

Here are some examples in simpler terms:

1 channel (hi power) amp can run a subwoofer.
2 channel amp can run 2 speakers, or 1 sub (bridged).
4 channel amp can run 4 speakers, or a combination of 2 spkrs + 1 sub (bridged), or perhaps 2 subs (bridged).

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Bridge connections

Using 2150 as a slave





9_10_2012_11_16_35_pm.jpg

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I have a Behringer PMP 6000 that I just bought. With the power amp switch in Main L/Main R it works fine, but if I switch it to Main/Mon, only the Mon works, nothing from the Main. Bridge mode doesn't...


Bridge mode you use chan B (left connector on the back) using a SPECIALLY wired Speakon. The impedance of a speaker connected as such CANNOT be LESS than 8 ohms.

In the Main/Mon mode, the two amplifiers are separated in function. The monitor knobs for EACH channel input control the mix sent to Channel A which is for the monitor speakers. The Mon1 controls the level sent to Output A for the monitor speakers. Mon2 fader is NOT used.

The individual channel faders control the main mix and the Main fader controls the level sent to Output B which goes to the main speakers.

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if ur output power amp is defective u will have that problem - meaning the moment u connect load across it it will go into circuit protection to limit/stop excessive output current. make sure the speaker terminals are connected to +/- output terminals. in bridge mode use only channel 1 and that too with 4 ohms speaker only otherwise amp will clip. considering all connections are okay if it still clips when speaker is connected, u have a faulty power amp section. this the way ur amp is designed

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The linksys utility always sends signal to PC speakers, even when wmb54g unit shows connected. The wmb54g and router are up-to-date and run WEP 128 security encoding. The wmb54g flashes faster when...


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Zapco DC Reference 750.2 problem


If the amp uses TIP35Cs and TIP36Cs, those will be the output transistors. Measure the resistance between legs 2 and 3 for each of the output transistors. Do any read near 0 ohms?

If you're new to repairing amps. The following page should help.
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2 Answers

Can I run two E.V. Eliminators (1-15 and horn...8 ohms) in series from the bridged output? What my wattage be? I have an EMX5000 powered mixer. Jim Price [email protected]


Hi pocket218

Probably not the way to go about hooking it up. running speakers in series is not very practical with PA gear. The connections get messy to make as you need adaptor leads, and it is something that is seldom ever done.. When you use bridge mode it uses left and right channel together to drive the one output, combining the power. Best bet is to run the EMX5000 in stereo mode, and connect 1 speaker to each channel. You may have been trying to reel in extra power from using bridge mode, but the power amp stages in the EMX will only ever be able to deliver the same MAX power whether in bridge or stereo. the best way to get maximum power and sound pressure levels from the unit is to hook TWO speaker boxes to each channel, you get the combined increase in efficiency of the extra speakers and run the output stages at 4 ohms to get absolutely all the power available
If you have any questions about it, feel free to ask me, happy to talk to you further about it.

regards
robotek

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1 Answer

On lucent amps you sometimes have to bridge two terminals together to make it work. i need to know what two need to be bridged.


I'm not sure if Lucent has a special bridging procedure, but on most if not all other amps, when you bridge you DON'T connect two terminals together. What you do is instead of using the plus and minus terminals on one channel to one speaker and the other +/- terminals to the other speaker, you will instead use the plus (+) terminal from one channel and the minus (-) terminal from the other channel to drive one speaker and the remaining + and - terminals remain unconnected. Be sure you use the + and - terminals that are marked for bridging. Please note, that when you bridge that your speaker load DOUBLES to EACH channel. In other words, what your amp saw as a 4 ohm speaker going to one channel alone, it now sees as a 2 ohm speaker on each channel when bridged. Be sure you know what you are doing before you bridge and fry your amp. In my experience, if after bridging your amp works fine for about a month and then fries then you bridged wrong and ended up with the wrong speaker load on each of the bridged channels. Be careful. Amps cost a lot to repair. Good luck.

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