I have read much about the nesessity (or not) for a resistor as a high pass on a piezzo tweeter, but my use is different. I play bass. I have a big amp rated at 4 ohm max, and a big speaker which is rated at 4ohm. My difficulty, mainly at rehersals, is that I can't hear the actual notes played since the cab points at my legs and I'm standing too close.
My solution is to use a piezzo bullet tweeter as a monitor pointing directly at my head, just to provide the HF that I am missing. The audience doesn't need to hear it, so actual musicality is not an issue.
It needs to be high impeadance at all frequencies because it's I can't go noticably below 4ohm total. It doesn't want to be loud and needs to survive an 800W amplifier (I would never run it anywhere near that.)
How can I tune it and pad it?
My solution is to use a piezzo bullet tweeter as a monitor pointing directly at my head, just to provide the HF that I am missing. The audience doesn't need to hear it, so actual musicality is not an issue.
It needs to be high impeadance at all frequencies because it's I can't go noticably below 4ohm total. It doesn't want to be loud and needs to survive an 800W amplifier (I would never run it anywhere near that.)
How can I tune it and pad it?
"the cab points at my legs " - & where are your ears??? - you turn it up 'cause you can't hear, the guitarist turns up, 'cause your'e drowing him out - viscious circle (bben there, done that); "tilting the cabinet back" - +1
Richard/ Pete
Thank you for your suggestion, but frankly, its off topic. Its not the question that was asked. The cabinet is a vertical 2 X12 tipping it back would result in it falling over and my amplifier falling on the floor. I've been playing and running P.A. for 30 years. It sometimes works for guitar gear with smaller amplifiers. I don't know where the idea of a viscous cycle of volume comes from. You must be thinking about a different post. This post is about a small monitor which points at the players head to avoid a cycle of volume.
I asked for technical assistance. I'm still eager to find out.
Thank you for your suggestion, but frankly, its off topic. Its not the question that was asked. The cabinet is a vertical 2 X12 tipping it back would result in it falling over and my amplifier falling on the floor. I've been playing and running P.A. for 30 years. It sometimes works for guitar gear with smaller amplifiers. I don't know where the idea of a viscous cycle of volume comes from. You must be thinking about a different post. This post is about a small monitor which points at the players head to avoid a cycle of volume.
I asked for technical assistance. I'm still eager to find out.
Hi,
Quite frankly your problem simply doesn't exist if you can play bass.
A piezo will make utterly no difference to audibility of bass notes.
Which is simply never an issue with any decent bass rig, and the
idea you you cant hear bass because your too close to your
rig is utterly ridiculous, the reality is quite the opposite.
If you rehearse with a bunch of muppets that play stupidly
loud just because they can you are wasting your time.
I used to rehearse with my 15W valve 15" combo
and simply wouldn't have any truck with volume
issues. The drummer had to reign back and so
did everyone else, giving the singer a field day.
YMMV, but I had no truck with full on rehearsing.
Just as much as I dislike playing live as loud as
possible, to the serious detriment of vocals.
rgds, sreten.
Quite frankly your problem simply doesn't exist if you can play bass.
A piezo will make utterly no difference to audibility of bass notes.
Which is simply never an issue with any decent bass rig, and the
idea you you cant hear bass because your too close to your
rig is utterly ridiculous, the reality is quite the opposite.
If you rehearse with a bunch of muppets that play stupidly
loud just because they can you are wasting your time.
I used to rehearse with my 15W valve 15" combo
and simply wouldn't have any truck with volume
issues. The drummer had to reign back and so
did everyone else, giving the singer a field day.
YMMV, but I had no truck with full on rehearsing.
Just as much as I dislike playing live as loud as
possible, to the serious detriment of vocals.
rgds, sreten.
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To answer your question: a piezo tweeter has an extremely high inpedance, and if wired in parallel with your bass driver, will have virtually no effect on the total impedance. If you need to cut it's output refer to the the first reply by GM. (an Lpad WILL effect the impedance)
How bout a bone conducting piezo on the back of your head?
Assuming you don't want to be seen wearing headphones or
bluetooth or whatever...
But seriously, put your 2x12 on on its side, and tilt it up
like a floor monitor. Even if you have to make something
to hold that tilt with a shelf to set the amp on...
Or even an angled board to reflect some of that sound up
at you, if you insist under no circumstance the cab tilts...
Assuming you don't want to be seen wearing headphones or
bluetooth or whatever...
But seriously, put your 2x12 on on its side, and tilt it up
like a floor monitor. Even if you have to make something
to hold that tilt with a shelf to set the amp on...
Or even an angled board to reflect some of that sound up
at you, if you insist under no circumstance the cab tilts...
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A small high frequency monitor is a good idea, but piezos generally sound crappy, especially when run low enough to fill in the missing frequencies from your beaming 12", 2000 Hz and up. There are many small compression drivers, or even small speakers (like the Hotspot) that would do what you want and sound good doing it, provided a passive crossover is used for protection.
They will cost more, but you get what you pay for. No major sound company has used piezo tweeters in several decades for good reasons, they just sound lousy.
PS, Kenpeters suggestion of a angled board is a good one for practice, a can propping up a rack lid in front of your 2x12" and your problem is solved with no expense.
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I'd just go for an 8ohm (or 16ohm, if available) closed back midrange speaker, high-pass with an inline cap and put it in parallel with the main speaker.
No need for an actual cabinet, but you could make an L-shaped baffle with a hinge to get an angle you like.
Knocking the 2x12" on its side would also help - give that a try first.
Tried earphones?
Chris
No need for an actual cabinet, but you could make an L-shaped baffle with a hinge to get an angle you like.
Knocking the 2x12" on its side would also help - give that a try first.
Tried earphones?
Chris
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