Balanced cable – depends on the cable thickness to an extent but generally 100 to 200M is perfectly OK and yes you can used CAT5e as long as it’s FTP (i.e. it has a screen/shield)Unbalanced cable – no more than 5M as it is far more susceptible to RF interference.

Depends on several things:How big is the amplifier (in watts)?

What are you ‘tapping’ the speakers at?

If we assume that the cable run is no more than 300M from amplifier to last speaker then cable can be 1mm standard 2 core flex. After that it is a simple case of maths – if you have a 60 watt amplifier you would generally want to leave 20% headroom, in an ideal case, which leaves you 48 Watts of load available. A typical example is shown below:

PC-1868 – (can be tapped at 6/3/2/1W) – at 6 Watts you can fit 48/6 = 8 x speakers , tapped at 3 watts you can fit 16 speakers and so on.

This example can be applied to any 100V loudspeaker, you just have to know what the taps of each speaker are.

And YES you can have many different types of speaker (ceiling, horn, wall, cabinet etc.) all on the same amplifier.

Generally 2 core stranded. Simple answer is to include a table such as:

Cable size
Power .75mm 1mm 1.5mm 2.5mm 4mm 6mm
30 800m 1066m 1600m 2666m 4266m 6400m
60 400m 533m 800m 1333m 2133m 3200m
120 200m 266m 400m 666m 1066m 1600m
240 100m 133m 200m 333m 533m 800m
One of the great things about 100V is that you can run your speaker cables pretty much any way you like, so long as the speakers all end up in parallel when presented to the output of the amplifier. This means you can run them on one long cable run from start to finish or star wire every loudspeaker back to the amplifier – you just have to be aware that cable does have an impedance and so will add to the overall load. That said if you’ve allowed a sensible amount of headroom in your amplifier this shouldn’t be a problem.

This really needs a photo of the back of an SC-615M and explain – they normally arrive ‘out of the box’ at their maximum tap setting so it is important to adjust the tap before the speaker is installed…

Example – anSC-615M has15W /10W /5W /3Wtap options, in impedance this relates to 666Ω / 1KΩ  / 2KΩ  / 3.3KΩ  The basic maths for this is P=V2/R or R=V2/P

So R (impedance)= 1002/power in watts: 2000Ω  = 10000/5watts

(V is the 100V line constant so is always 10000 in the UK)

Specific questions for VM-2000 series:

4 – you can also add PM-660 microphones as well to the 3 mic/line level inputs.
As the card uses MP2 compression for the messages you have almost 60 minutes of audio.
From the RM-200M paging station and from contact closures on the I/O connector on the rear of the amplifier.
A maximum system is 9 amplifiers giving 45 zones

The VM-2000 system as a whole has a cable distance of 800M – this is the distance from the first microphone to the amplifier and out to the last amplifier. So if you have 1 x VM2240 then the RM-200 can be 800M away – although you would need to power the RM-200M locally with a PSU (AD-4800 or AD-246).

YES -this will duck anything connected to the BGM inputs.
The VM-2000 series amplifier is a fairly complex amplifier – with this in mind it is vital that the installation manual be studied prior to any site visit where one or more of these amplifiers is to be installed.


Specific questions related to A-1700 series.

NO – it is a simple mixer amplifier and has no priority structure

This is an odd one, it works via a simple contact closure but if the amplifier is ON the contact closure will turn it off. But if it’s OFF the contact closure will turn it ON!!

This is a simple10KΩ  Potentiometer and adjust the master volume level.


Specific questions related to A-1800 series.

No, this is just a standard line level input with an associated control input and can be used for any line level input. To connect an analogue telephone port you would need something like the ZP-001T card that is part of the M-9000 range of input cards.

Yes & No. You have to remember that both the 1700 & 1800 series only have 1 amplifier channel internally. It does however have 2 x speaker zones which can only be selected via the front of the amplifier. These switches turn the speaker outputs at the back on and off. The direct out is not affected by these buttons.

No, there is no external access to the control of these zones