Bridging is pretty simple. Two of the amp's outputs are used for one speaker. This will double voltage, and quadruple the power. This requires that one signal uis inverted.

 

In a typical bridgeable amplifier you need to set a switch for bridge mode. You will then carefully note the wiring diagram in the manual and/or on the back of the amp, and connect your speaker to the indicated outputs on the amp.

They measure the same thing.

 

Input sensitvity is simple to understand. If the input sensitivity is 1 volt, the amp will be able to hit full power with an input of 1 volt. A higher input sensitivty means you need more voltage to drive the amp to full power. Many receivers have a pre amp rated for 1 volt RMS, which means they may not be able to drive all amps to full power.

 

Gain is measuring the same thing as input sensitvity in a different way. I will give a handy formula 

 

Gain (as a multiple) = 10 ^ (gain / 20)

Divide gain (dB) by 20, and use inverse logarithm (base 10) on your calculator

 

For 32 dB, we would get a gain of 40 times.

 

To convert this to input sensitivity, we would use this formula -

Input sensitvity = sqrt(max_amp_power * 8) / gain_multiple

 

Assuming a 200 watt / channel amp into 8 ohms with a 32 dB sensitivity -

 

sqrt (200 watts * 8 ohms ) / 40 = 1 volt

 

So a 32 dB gain would mean a 1 volt input sensitvity. Higher gain means an amp will match better with processors, preamps and receivers with lower pre amp output.

 

A solid state amplifier does not have an impedance as such (tube amps are a bit different in this respect.)

 

Almost any audio amplifier will work with 8 ohm speakers (with some exceptions such as fixed voltage amps.) As you lower the impedance of speakers you connect to a amp, you place more demand on it. Lower impedance means more current will flow through it's output devices (usually transistors). More current means more heat.

 

4 ohm loads present a more difficult load for amplifiers. The lower impedance means electricity will flow more easily. That means the current flow will be higher. Higher current means more heat will develop in the amplifier, especially in the output devices. Amps typically have themal protection circuits. If you your amp is shutting down due to thermal overload, you are driving it too hard, not giving it enough ventilation, or the amp is not working properly.

 

Amplifiers sold for pro audio applications, and for home audio would usually be able to handle 4 ohm loads with no issues. Receivers may shut down under heavy load. Or perhaps their longevity could be reduced, because they were not really designed for 4 ohm loads. Lower impedance is not suggested, such as connecting two 4 ohm speakers in parallel.

There are two answers to this.

 

One answer is to buy as much power as you think you will need, budget permitting. Compromising between power and budget is a good idea, as you can accept a 3 dB drop in SPL, which is not much of a drop in loudness and reduce power needs by half.

 

The other answer is that amplifiers can sound different, and you will have to take this into account. Quite a large number of blind listening tests have shown that amplifiers sound very similar. To take one extreme case, the most budget of Pioneer receivers was once involved in a listening test with much more expensive amplifiers. No one could do better than chance in identifying the pioneer (statistically speaking). If someone tells you they heard a dramatic or a night and day difference by switching amplifiers, you may want to consider the possibility they are overstating the situation.

We have professional engineers who could design a complete and perfect solution with clear connection diagram for you, with detail introduction to the products, you would find it easy working with us.

 

Of course, ODM service is available to us. 

Just tell us your idea and demand, our experienced engineer would customize and develop the device for you. 

Without yourauthorization, we would not tell others we are your supplier, and we would not sell your products with our own brand.