Zero if they are in swinging range and you have a cort bass. Lol.
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This thread will undoubtedly lead to that very subject. 10s, 12s, 15s, choices choices.
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Imagine sitting in a crowded restaurant and having coffee with someone. The ambient sound level created by all of the voices talking at the same time creates a drone noise and you find yourself having to concentrate to hear the person sitting across from you. Yet, for some reason, there is this one voice on the other side of the dining room that you can hear clearly. Has anyone experienced this?
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Pretty good analogy, @Gorch . . . and good idea for a thread, too! 
Without getting too âscientificâ, I have noticed a significant increase in output when I crank up the low midrange on my Rumble 100 during practice (all other settings remaining the same). @howard also mentioned this above. 
Although Iâm not planning on playing in a band anytime soon, Iâm more interested in getting the most bang out of the same physical size amp. For that reason, I was thinking of trading in my Rumble 100 for a 500 later on. So thereâs also the 1 x12" vs 2 x10" issue to consider.
Yes indeed . . .
Cheers, Joe
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Ok then. This is 100% related to the voice across the room and the speaker size questions, trust me. There is a method to my madness. Do you know who B.B. King is?
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I feel like someone hit me in the HEAD with a bass just from trying to comprehend this thread.
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Bummer. Iâm trying to make it simple. I guess Iâm not doing so hot.
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Youâre doing fine, itâs not you itâs me. Iâm a bit dense when it comes to this stuff.
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B.B. King is famous as a blues guitarist. Nearly everyone has heard of him. Why did he gain such notoriety? By todayâs standards he wasnât a very good guitarist. He basically played some form of Joshâs blues box for 40 years and folks loved it. If you check out a video of him you donât see piles of amps on stage or lots of pedals etc. He kept a simple band, he played simple riffs, he used simple gear, and he was a legend. Why?
He played what HE wanted, he sounded like HE wanted, and as a result he played with passion. He could pour his heart and soul into blues. He also knew how to lay his sound where it fit. He didnât compete for space in the sonic spectrum. He had his lane and he stayed in it. The rest of his band did the same.
The sonic spectrum is like a big sand box. The whole band jumps in it to play. The more cluttered the sand box, the less room everyone has. There is only so much audio spectrum that the human ear can hear so the sand box is only so big. If one starts to play in anotherâs âspaceâ things get crowded. The mix gets âmuddyâ. Some genres of music make use of this so itâs not a bad thing necessarily, but most of the time itâs not the optimal scenario.
If this is the hypothetical situation, and you donât have enough space to play in, then folks are tempted to solve the problem by dumping more sand in the sand box, also known as getting more power so they can become the master of their space in the sonic sand box. Now, they are stepping over into other peopleâs space. What follows is a volume shoot out that ends in a muddy mess.
How much power do you need? What size speakers are best? How do you get heard? Iâll be back later to take those one at a time but you need to figure out what it is that YOU want from YOUR passion. There is no hard and fast formula for what is best. There is only what is best for you. After all, if you donât enjoy playing or you donât like your sound then whatâs the point. I can help you figure out what is best for you and I hope others join in the thread and share ideas and view points so we can all learn from each other.
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LOL. I love it
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HOW MUCH POWER DO YOU NEED? Not as much as you think. For the musician, TONE is king. weâll get back to this statement in a bit. Just some real world application first, then weâll talk about the bass playerâs place in it.
If you end up playing in any size venue at all then you will have a PA system complete with a sound guy to run it. You will have somebody like @DaveT there who knows the science behind the function. You must trust your sound guy in these situations because what you hear on stage isnât what the audience is hearing. Your sound guy will make you stand out. He will make you sound good because making you sound good makes him sound good. With that in mind, you really donât have to worry about power or dB or levels or anything else. Let the sound guy do the heavy lifting. Thatâs what they do.
After saying all that, all you need to be concerned with is your sound, your TONE. If you donât sound good to you then your not going to be able to just roll with it. So make sure you sound like you want to sound then send a signal to your sound guy and he will take from there. So now the long awaited answer. How much power do you need? Enough to reach across the stage and still have room to turn it up some. Anywhere from 250 to 500 watts will do everything you need to do. Most of the time you will be nowhere near taxing your amp. In fact, if your too loud, the sound guy will have you turn it down some. That size of amp will fill a good size room by itself. Think small church size or school gym size. You can dial your controls back and use it in your music cave or crank them up and play a fund raiser at your kidâs school. Two recommendations here, make sure your amp has an XLR out so you can plug in to the house system when available and never run your amp maxxed out. Your sweet spot for tone will be somewhere in the middle unless you play metal in which case you will have your gain cranked as well as several other gadgets in place to distort your sound. If you absolutely have to have your amp dimed out just to keep up, THEN look at getting a bigger amp. Again, this is based on experience, not science. Participation and opinions welcome.
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Iâd be curious to hear @DaveT chime in on this and give some pointers from his perspective.
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Awesome! Probably want to go one more octave there too 
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I could do the math and show you the numbers why your answer works for the situations you describe, but you are correct, it wouldnât really matter because what you have found through experience is what works for you. Thatâs really the advantage of having this forum, lots of experience to draw from and use as a starting point until someone gets their own experience. I find it particularly useful that collections of people are using the same gear and talking about it, specifically the Rumble line and the Zoom processor. It really gives a lot of perspective on how that gear behaves for a variety of people attempting to do a variety of different things.
The answer to any audio engineering question anyone asks me is usually, âIt depends.â What kind of music? What kind of stage? Who else is on the stage? Who needs to hear you? How are they going to hear you? Who doesnât want to hear you? How big is the audience? What shape is the audience? How far is the stage from the audience? How far are you from other people on the stage? What is the shape of how everyone is placed on the stage? What microphones are being used where? How is stage monitoring accomplished? Are the musicians wearing in-ear monitors?
Anyone who has played in a similar situation to the one someone is getting ready for is going to be able to give way more useful and readily understandable information than I can with math. My advice would be to copy a rig from the experienced and then make your own modifications from there.
As a public service announcement Iâd strongly encourage anyone experiencing high SPL levels on stage to consider the options for in-ear monitoring.
The power topic is one of the most misunderstood among anyone, including engineers. I could talk about it for hours. Often times manufacturers donât follow a standard when measuring their gear and quoting power numbers. It used to be in pro audio that amplifiers were pushed to some reasonably acceptable THD (total harmonic distortion) for a given test signal and that was considered their average power rating and their peak power available for short transient sounds would be 6dB higher. That means that a 100W amp average power rating could put out as much as 400W, but only for a very short time. With digital amplifiers they often quote a higher power number than with analogue amplifiers because they are capable of sustaining their peak power for longer. Sooooo, many digital amplifiers will say their power rating is 400W, but thatâs it, it isnât going as much above 400W for a peak, thatâs all you get ever, but unlike an analogue amp you can get it for long enough that it can be rated higher. Many manufacturers of music products get their amplifier boards from a company that came out of Bang + Olufsen, the IcePower product. Open any mini-amp and thereâs probably a chance this is inside. Each manufacturer makes their product special by adding the cab sim, integrating an effect or making a tone control people like. Companies donât always invent their own audio amplifier boards. IcePower History
Something else to look for when considering amplifier power is what impedance load you are driving. Some amplifiers will put out full power with either a 4 Ohm or 8 Ohm load. Many will advertise the 4 Ohm power rating and put out half as much with an 8 Ohm load, a 3dB performance drop.
I know this is all head spinning, which is why I say use a rig that someone likes.
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Just to prove to myself I didnât make this up, I found the bit that takes off the cover to a Darkglass Microtubes 500. The board in the center is the IcePower ASX125. The board on the back of the front panel Is by Darkglass and does tone control and overdrive. The board on the back is by Darkglass and handles line drivers for the effects loop and DI outs. The speaker output has a piggyback board with some giant resistors to pad down the main power output for headphones.
This is a fabulous quality board if you find it in your amp!
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Thank you @DaveT. As you can see, there is a lot to the science end of things. Thatâs why I say to let the sound guy do the heavy lifting.
Think about it. If you the bass player, had to worry about all of that stuff every time you did a gig then you probably wouldnât gig very much because it isnât any fun.(unless your a sound engineer) They get down to the nitty gritty of it so you donât have to.
On another note, he mentioned monitor options. I deliberately avoided that subject but without going into it too deep, a monitor is simply a way for you to hear whats going on.
You can use your amp as a monitor if the whole stage can hear it, you may have wedges, (speakers on the floor pointed at you) with a sound sample of the product, or you may have portables, (a personal monitor just for you) or you may have an in ear system,(ear pieces plugged in to a device that lets you adjust the mix you want to hear) but suffice to say, your sound guy will handle that too. There will be monitoring of some sort. Donât sweat it.
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Next up, SPEAKERS. 10s,12s,15s, 410 cabs 212 cabs⌠Whatâs best???
NOTE: Iâm not going to talk about impedance here (4 ohm vs. 8 ohm) There is already a good thread on that subject on the forum. I will simply say buy matching gear or a combo and thus you donât have to worry about it.
To recap a little, TONE is KING. This is your passion, sound the way that best pleases you. If you do that, you will enjoy playing and others will enjoy playing with you and listening to you. We will get a little deeper into how to get your tone later on but the speaker configuration you start with has a lot to do with it. Going back and forth over is this set up better than that is an argument with no solution like Ford vs. Chevy or Ruger vs. Glock. Itâs totally a preference thing and will probably change over time.
First, letâs talk about sound in general. A frequency is a sonic wave at a given speed, the faster the speed, the higher the pitch. The slower the speed, the lower the pitch. A freq is what you hear when you get a hearing test. Itâs constant with no unique character what so ever. A SOUND is a collection of different freqs with variable amplitudes( just a fancy word for how strong a particular freq is compared to the others) With that in mind, a speaker generates SOUND in a given FREQUENCY RANGE( from the lowest pitch it will discern to the highest pitch it will discern) based on itâs sensitivity. Different speakers respond more readily to some freqs more than others in their design range. This is why you can generate the same sound out of three different speakers and get three different sounds. Some are more low end sensitive, some are more high end sensitive. All of these differences are due to things like how a speaker is made and what it is made of. Already there is tons of variety and we havenât even discussed size or configuration yet.
Now lets look at speaker diameter, 8 vs.10 vs. 12. vs. 15. For this you will have to imagine a graph of some sort showing the response over the given frequency range. Since all of the speakers we are talking about are designed for use in bass guitar amps, we are going to assume that the freq range of all of the speakers is the same (for the most part, this is true)
If we hit our A string and generate a sound out of a 15" speaker, we will see on the graph a gradual uphill slope to the point of highest sensitivity then a gradual downhill slope to the other end. Wide speaker, wide graph. Now if we do the same thing with a 12" speaker we would see the uphill and downhill slopes are a little steeper and the point is a little higher.
This is because you are putting the same frequency range into a smaller area. The smaller you go, the steeper the hill and the sharper the point. Again, this is non scientific general information, not exact design specs. Anyhow, what this means is on a 10" speaker, for example, you may have to boost you lows and highs a bit more and reduce the mids on your amp in order to make the hill on your graph more flat. When you adjust the EQ on your amp, this is essentially what you are doing. You are compensating for the frequency response of your speakers in some fashion to bend the sound to your liking. In the case of the 15" speaker, you may not have to make as much adjustment to your EQ but you will have to push the speaker a little harder to bring the level up to where you want it to be. This is the trade off. Nothing is free. You can put a 110 cab in your music cave, set your EQ to taste and it will sound good at low volume and your neighbors will like you. If you take it outside, you will have to really crank it up and dial back your EQ a bit to get the same âperceivedâ result.
If you put a 115 in your music cave, you will have to crank the volume just to get enough response to set your EQ.
Having said all of that, know that companies that design and market bass amps and cabs know what you need and they are going to make products that will work for you. They are ALL designed with a âsweet spotâ somewhere in the middle of the amps capability. Thatâs the nuts and bolt of speaker SIZE. Iâm going to take a break for a minute but part two will be speaker configuration.
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This kind of makes sense for class D power amps. The tonal qualities come from the preamp and any effects or stuff you put on it, but for the power amp stage all ypu really care about is it is a transparent power boost and doesnât distort audibly, due to how class D amps work.
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