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NEW Phil Jones MICRO 7 Compact Combo!

#21
selowitch said:
Sure, but isn't the loudness of an amplifier strictly a function of its output (i.e., the amplitude of the signal sent through the speakers)?
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no. the loudness is also related to the strength of the signal coming in... if it wasn't then the volume control on your bass wouldn't do anything. The amplifier amplifies what comes in. If the signal is bigger to start with, it will be bigger coming out.
 
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#22
Djadja said:
no. the loudness is also related to the strength of the signal coming in... if it wasn't then the volume control on your bass wouldn't do anything. The amplifier amplifies what comes in. If the signal is bigger to start with, it will be bigger coming out.
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That makes sense but doesn't it seem logical that there is still a maximum volume the amp can reach that is not increased by the presence of a preamp? After all, the Double Four contains two preamps, one for each speaker as shipped stock, does it not?
 
#23
selowitch said:
That makes sense but doesn't it seem logical that there is still a maximum volume the amp can reach that is not increased by the presence of a preamp? After all, the Double Four contains two preamps, one for each speaker as shipped stock, does it not?
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I assume it has a single preamp. It is not stereo is it? Your signal comes in, is modified by the internal preamp and sent to the power amp and then to the speakers.
Of course it has a maximum volume. There is a point at which the internal preamp is overwhelmed by too much signal coming into it and all you get is more distortion, not more volume. It also may have a compressor or limiter than essentially reduces any incoming signal (I don't know whether this amp has one) to avoid that, but still, the amount of incoming signal impacts what comes out as long as it doesn't overpower the internal preamp.
 
#24
selowitch said:
That makes sense but doesn't it seem logical that there is still a maximum volume the amp can reach that is not increased by the presence of a preamp?
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That depends completely on what is feeding the amp. If the internal preamp doesn't make enough gain to fully drive the output section when fed by a low output instrument, then an external preamp will in fact increase available volume.
 
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#25
selowitch said:
That makes sense but doesn't it seem logical that there is still a maximum volume the amp can reach that is not increased by the presence of a preamp? After all, the Double Four contains two preamps, one for each speaker as shipped stock, does it not?
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The D4 contains one preamp and 2 power amps, one for each speaker. If the signal from the bass can drive the preamp to saturation, that's as loud as you are gonna get.
 
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#26
I have to qualify my earlier post - ime the preamp with the d4 makes a big difference with upright bass, less so with electric. The upright is not able to drive the d4 preamp into clipping even with the gain full up and also helps with the impedance mismatch so the sound is not only louder but fuller.
 
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#30
20190225_232120_Film2.jpg 15511658044641233638098.jpg
 
#33
Some of these batteries have an auto shut off feature that makes them unusable for powering a D4. I bought a Vinsic with all the right specs and it didn't work because of this. Stick with the ones recommended here - I think Poweradd was recommended by Phil Jones himself.
 
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