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[Tim McCulloch]

Wouldnt the voltage increase when wired that way?

You pick up 6dB of increase in input sensitivity when you bridge, and often that is mistaken for an increase in *TOTAL* output voltage capability.

The total voltage swing of the amp's output section can't go any further than it does in dual channel mode.  What you've gotten is a greater current reserve.

[Mac Kerr]

You pick up 6dB of increase in input sensitivity when you bridge, and often that is mistaken for an increase in output voltage capability.

The total voltage swing of the amp's output section can't go any further than it does in dual channel mode.  What you've gotten is a greater current reserve.

Actually, that 6dB increase is due to increased voltage capability. In bridged mono mode you are using 2 AC voltages of opposite polarity for a voltage difference between them that is double (6dB) that of a single channel to ground. That double voltage continues to be double until each side individually reaches its maximum, which will still be double the maximum voltage of a single channel.

Mac

[Tim McCulloch]

Actually, that 6dB increase is due to increased voltage capability. In bridged mono mode you are using 2 AC voltages of opposite polarity for a voltage difference between them that is double (6dB) that of a single channel to ground. That double voltage continues to be double until each side individually reaches its maximum, which will still be double the maximum voltage of a single channel.

Mac

DOH!

I shouldn't post before coffee....  Original post modified...

[Marc Platt]

Actually, that 6dB increase is due to increased voltage capability. In bridged mono mode you are using 2 AC voltages of opposite polarity for a voltage difference between them that is double (6dB) that of a single channel to ground. That double voltage continues to be double until each side individually reaches its maximum, which will still be double the maximum voltage of a single channel.

Mac

At least everyone agrees....

[Mac Kerr]

DOH!

I shouldn't post before coffee....  Original post modified...

Sometimes bad things happen to good people.


Mac

[Marc Platt]

Sometimes bad things happen to good people.


Mac

Yea it does. But what pisses me off the most is when good things happen to bad people.

[Scott Carneval]

Typically the "higher" the pinset number, the higher the pass band frequencies... your HF would be on pinset 4, mid (or LF in a 2 way box) on pinset 3, and subs on pinsets 1 & 2.

For example, in JBL's VerTec 4889 the 2-15" speakers are powered on separate pinsets, so LF is on 1 & 2, mids on 3, HF on 4.  There is no pass-through for subs.

And it's always a good idea to follow this practice just in case an inexperienced operator wires the PA wrong.  If your HF drivers are on +1/-1 and someone accidentally connects a full-range signal (or even worse a LF signal) to those pins, the HF drivers will be smoked.  If you accidentally send a HF signal to your subs chances are you're not going to hurt them. 

[Tim Padrick]

Actually, that 6dB increase is due to increased voltage capability. In bridged mono mode you are using 2 AC voltages of opposite polarity for a voltage difference between them that is double (6dB) that of a single channel to ground. That double voltage continues to be double until each side individually reaches its maximum, which will still be double the maximum voltage of a single channel.

Mac

The voltage will be double that of the individual channels in stereo mode until the current limit of each channel is reached.  The max swing will be less than 2x that of an individual channel if the load is sufficiently low.

[Jeff Bankston]

I am actually still running at 4ohm loads per amp ch, just instead of the parallel connection of the 2x18's taking place inside the enclosure (as orig) I wired each of the drivers in each box with seperate pair of 12ga and then they are wired to parallel at the amp rack (4ohms nom) Just doubled the effective wire dia.
  When you tested the amp brdg mono with the pair of drivers parallel, you did not hear any difference? Wow that is not what Id expect with double the power.

no difference

[Dave Dermont]

I am still trying to get past someone doing a critical listening test saying "the loudness and bass tone control were set on max".

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