This is a tough one due to the info at hand, but I'll take a stab at it.
I'll assume that your amp is not a tube-type amp. I'll also assume it is a relatively recent "solid state" design. If those assumptions are correct, connecting a 6 ohm load to an 8 ohm amp should not cause significant overheating or amplifier instability.
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Because you've done something with the speaker connections that's too low impedance for the amp.
Amps need a certain level of resistance from the speakers otherwise there's a risk of the amp blowing itself up. Impedance is the name for resistance that varies with audio frequency. If the speakers you connected are any good, then there'll be label on the back telling you their impedance in Ohms.
When running a single set of speakers only then the amp would prefer an 8 Ohm load but it will accept a 4 Ohm load. If you plan to run speakers in both the A and B sockets, then both sets of speakers have to be 8 Ohms and no less. It also tells you this on the printing directly above the speaker sockets on the amp.
The amp is trying to protect itself from an overload situation where it would blow its output transistors and possibly kill your speakers too.
The question doesn't really make sense because a Tannoy S10 is a speaker. You can daisy chain as many speakers as you want. That's not the issue though. It's what load the amp sees that's the problem.
Most Hi-Fi speakers are a nominal (that means average) 6~8 Ohm load. However, the Impedance varies with frequency and phase. So at certain frequencies the amp will see a much higher load; maybe as much as 30 Ohms. At other points the load will drop to 3 or 4 ohms. The reason why your amp doesn't fry itself is that music contains a wide range of frequencies, so the load is made up of lots of different slices of impedance all summed together.
If you start to add extra speakers on to an amp then one of two things will happen. Either they'll be wired in series; in which case the Ohms load will increase by the addition of the speaker impedances e.g. 8 Ohm + 8 Ohm = 16 Ohms pre channel. Or the impedance will be reduced because the speakers are wired in parallel (1/8 + 1/8)inverse = 4 Ohms.
16 Ohms is about on the limit of what a very good Hi-Fi amp could drive. But the volume will be reduced and the amp will go into distortion much earlier.
4 Ohms is a much bigger problem. The impedance swings will dip dangerously low to the point where the amp sees the speaker load as a short across the terminals. At that point the amp will dump a whole load of current into the speakers, thus frying the voice coils and burning itself out. That ends with a small puff of smoke and a very large repair bill.
If you want a system louder then you have to add more amps and more speakers. Simply piling speakers on to an existing amp won't do it. You're spreading the amplifier power more thinly because of the extra load, so each speaker ends up being quieter.
If you are running three 8 ohm speakers in parallel then the total impedance would be 2.667. If running two 8 ohm and one 6 ohm speaker in parallel you would have 2.4 ohms. This will burn out your amp pretty quick. And very possible won't play at all. Though I have never attempted to play a home amp down that low in ohms. Guessing you may have an older model Denon type amp.
IF You don't have a separate external input jack. then you need to determine the overall impedance (ohm alottment ). so it will read something like 6, 8, or 16 ohm max. at that point look to see what your speaker output reads.(should be a plate on the speaker) if not, then disconnect speaker and put an ohm meter on it . it will give you a resistance reading , that is your ohms. so toadd a speaker, you must maintain not to exceed the rating. in hooking up. you can do it one of two ways. the first method woukld be , from the amp go positive to pos. side of speaker, and from the speaker neg. sid, go to the pos side of the speaker your adding . from the neg. side of that speaker go back to neg. side of amp. ( rthat is known as a series hook up. this doubles the ohm output of the two speakers ) - turns 4 ohms into 8, 8 into 16, etc. the other way is known as parallel. (from the amp take the pos.side and make a "y" and send those leads to each appropriate speaker. positive to positive. and do the same with the negatives. *this cuts your ohms in half. 4 int o 2, 8 into 4, etc. = hope that helps
Stereo and bridged mode selects automatically. Stereo mode gives 4-16 ohms per side. Bridged mode is only from 8-16 ohms. This impedance match is created by the combination of speakers you use. If you link any speakers, the wiring is usually going to be in parallel because of the sockets wiring in the cabs. Any time you link 2 speakers in parallel, it cuts the impedance in half. Remember that in bridged mode, do not link 2 8 ohm sets together because this will create a 4 ohm circuit which it will not allow. This can only be done in stereo mode. It is ok to use speaker combinations of higher impedance, but never go lower as it would cause damage to the power amp.
If your amp states that it will support a range of 6 - 16 ohms, an 8 Ohm speaker will work fine on it. If the speakers you hook up to it are lower than 6 ohms, it may work until you turn it up, then it will either shut down or burn out the finals. If you hook up a speaker that has a higher than 16 ohm, it will not get very loud, and it shouldn't hurt the amp.
I would not suggest mixing. Use either 6 or 8 only but i highly suggest not mixing unless it gives the option to set a certain input for a certain Ohm. If you mix your either going to mess up a speaker or the receiver itself.
Basically you can use any speaker as long as you use the volume button wisely. Damage will only occur if you raise the volume level to the extremes. Bigger speakers should be no problem, if you want bi-amping, your speakers should support that as well.
If you had 4 single voice coil speakers you can create either of those 2 ohm or 4 ohm setups. If you run 2 of them in parallel you will get the 4 ohms. If you run 4 of them in parallel you will get the 2 ohms. In parallel I mean that you connect the positives together and run them to the positive on the amp and the connect the negatives together and run them to the negative on the amp. Let me know if you need more help. Good Luck.