How many speakers can you hook up to a monoblock amp

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Can i hook up more than 2 subs to a monoblock amp? I currently have two alpine type-r 15" subs dual 2 ohm and its in a red atrend box and im selling it to get two alpine type-r 15 dual 4 ohm subs and a 12" type r sub. Are you sure you want to delete this answer?

A mono block means one channel but doesn't mean only one sub or even only two can be ran off of it. I would check out some wiring diagrams to match the subs to the amp and you can find some pretty helpful ones at kicker. So as long as whatever speaker combination you connect up remains in spec for the amp you should be fine. As you're suggesting 2 8ohm speakers in Parallel on a 4ohm amp, that should be absolutely fine.

Max van Andel October 1, 5: Thanks for the fast reply!

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So wattage has nothing to do with it? You can wire as many speakers are you want by combining series and parallel connections to maintain a safe impedance but you can run out of power since each speaker will use a certain amount. A lot of amps overstate their power. However, fact still stands, if you define power as the effect output on the amp according to ohms law, and that you stick to identically rated elements, more speakers will not produce more sound.


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The power-amp just doesn't magically produce more power unless you tell it to via the volume-knob unless it's a very strange amp. However, in the case where you intentionally build a speaker with several identical elements combined with good filter-solutions AND special cabinets. THEN you can get more out. But that is a completely different thing. We are not talking speaker-cabinet building here Especially using quarter or half-wave pipe-solutions , we are talking about connecting several ready-made speakers to an amp built to drive one speaker per channel, and that put aside, the lowered distortion that could be achieved is quite easily nullified by other electrical factors that probably would screw up the frequency-curve being output.

Lower distortion at the cost of fidelity Parallel, I remember that too, but as I recall it it was only the builder himself that actually percieved how good it was As is the case with many home-built projects Anyway, the theory is good, but the execution is a nightmare. I rather build my own elements from scratch to do what I really want them to do in the first place The amp will not automatically increase its voltage output just because it's working into a higher-impedance load You trying to re-write Ohms law?

Originally posted by SDplus: You use a 70V line. That's what those specialized amps and speakers are for. The output on the amp is labelled not "8 ohms" but "70 volts" and the speakers come with transformers to tap off of the resulting high-voltage, low-current feed. You can then connect any number of speakers with transformers across the feed as long as the amp power is sufficient for all of them; but it doesn't matter in the slightest if you have fewer than the amp can drive.

You trying to re-write Ohms law? For a given input voltage, you will get a certain output voltage. If, for example, you switch from 4- to ohm speakers, the output voltage across the speaker will be the same. Unless, that is, you can somehow explain how higher speaker impedance will increase the amp's gain. Originally posted by NoPostageNecessary: Man, talk about "pretty funny" Just why the hell should I care about "infrasonic" frequencies?

Can i hook up more than 2 subs to a monoblock amp?

You are aware that "infrasonic" means low enough to be outside the audible range? Assuming you meant "very low frequency bass", and that you really do have a good reason for doing after-sales vibrational stress testing on your car's fasteners and welds That's a different case. One, you do have them closely spaced well within half a wavelength for the narrow range of bass freqs that such subs handle, and two, you are halving the impedance, not keeping it the same! Many car amps are voltage- rather than current-limited into an eight ohm load.

So dropping the load impedance does let you "pull" more current and hence more power out of the amp to use a metaphor we're not supposed to use, but whatever. As for "virtually any quality amp", well, sure, for some definition of "quality".

Why does my Mono Subwoofer amp have 2 sets of speaker terminals

And that's true for a lot of good car amps. But an appalling number of home theater receivers can't even provide their rated power into eight ohms, let alone more than that into four ohms. Jim Z answered this, but for another part of the answer, Leper I was under the same misunderstanding when I first read about Ohm's law. But the fact is that most real-world power supplies, amplifiers, etc. Go to your lab and connect a resistor across a power supply set for some output voltage and no current limiting i.

Why is connecting multiple speakers to one output bad?

Measure the current and voltage. Now connect a resistor of half the value, repeat measurements. Did the voltage increase? For that matter, try it with a battery, or a couple of light bulbs and a wall socket. Does the line voltage out of the wall socket increase when you plug in more light bulbs? Your power amp works the same way.

It does vary the voltage a lot up to 40, times per second, counting half-cycles but at any given instant it's acting like a constant-voltage source in series with a very small resistance its output impedance. It does have a limited amount of current available, but in normal operation it acts like a constant-voltage source. And if you try to draw more current than it can provide, the output voltage will sag, not increase.

In an amplifier this is called "clipping. Over a range of load Rs the current remains constant while the voltage changes accordingly. But that isn't how audio power amps work. Originally posted by Jim Z: There are a few systems that will do it. Generally, they employ a multi-stage or variable voltage rail for the amplifier. Has to do with chance of total Qts, etc. Class-G and -H don't do that based on speaker impedance, but lift the rails based on input level. Was a long time since i looked it up, but doesnt the speakers count as coils as they are in a lot of ways. And i remember my friend sitting swearing over his math work with coils and diagrams smith???

Ohm law is pretty basic after all. Remember that a speaker coil moves through a fixed magnetic field, and is attached to a sprung mass. Above resonance, the speaker will follow an inductor model impedance increases as frequency does , but around resonance things get really screwy. This is the impedance curve of some generic 8" woofer I had on the shelf: Want a detailed electrical modeling for the speaker's impedance?

Check out page 3 of http: Thanks Jim Z, that makes it clearer.

How to Power Two Speakers with a One Channel Amp: 7 Steps

As i said, i havent dabbled in electronics with amps and speakers for a few years now, and one tends to forget some things. We got a killer upgrade deal back when v4. It's finally settled down, but I still think the DOS version is bulletproof by comparison. I'm probably going to recommend we move away from LMS.