My dc691p speakers require 9 vold dc. Will it do any harm to use a 19 volt dc

Hi Dan Bushey, I'm glad you found a solution, what does not close me is that Altec Lansing, which needs a DC 18volts and 650mA power supply, works with a source that delivers 9 volts and 19KW (???)
Maybe it will be 19 volts and 1.9 Amp?
Comment please
Greetings Franco Dosil

Hola Dan Bushey, me alegra que hayas encontrado una solucion, lo que no me cierra es que Altec Lansing, que necesita una alimentacion de DC 18volts y 650mA, funcione con una fuente que te entrega 9 volts y 19KW(???)
Tal vez sera 19 volts y 1,9 Amp?
Comenta por favor
Saludos Franco Dosil
https://www.manualslib.com/manual/4749/Altec-Lansing-Avs300.html?page=2

first is no i would not recommend feeding the 9 volt dc through the actual 9 volt ac it may damage the bridge rectifier that converts the ac to dc

The speakers use a 10 Watt power supply

Three C cell size batteries per speaker is what you use if you are on the go.

http://www.shopping.com/Koss-HD-50/the-paradox-decent-small-computer-speakers/1386310/reviews#tabAnchor

Hmmm.

EACH C cell battery produces 1.5 Volts (DC)
3 times 1.5 Volts (DC) = 4.5 Volts
Total of 9 Volts (DC)

500 MilliAmps?

Your main concern is with the Voltage.
The Amperage can vary. It can be more than needed.
Why?

Because Amperage represents Current.
How much Current is available.

(Water hose example;
Voltage is the speed, or velocity of the water coming out. Amperage is how many gallons per minute that comes out of the hose)

However, you better make sure that EACH speaker receives No more than 4.5 Volts (DC)
Since you do not have the special splitter adapter cord that comes with the power brick, you will have ensure that EACH speaker receives no more than 4.5 volts.

This is if you are trying to use a 9 Volt (DC) power supply. (AC adapter)

Please post additional questions in a Comment.
Regards,
joecoolvette

Check the power-connector on the speaker for the rating:
* AC versus DC
* 4.5 versus 5 versus 9 versus 12 versus 18 volts
* 0.5 versus 1.0 versus 1.5 amps
* pole-negative-ring-positive versus pole-positive-ring-negative

Try the local "Thrift Stores", once you have the specifications. You may get the correct suppy for less than $5.

The current factor for this model is around 750mA but if you can get an adapter with 1Amp rating there is no harm as the model requires good current factor with the 9 Volt supply.
Make sure that the polarity is correct and you do not cross connect on the pin.

C cells are 1.5 volts each. If the speakers use three of them that means you'll need a 4.5 volt supply. If each speaker needs batteries, you'll need to feed that voltage to each speaker, and the supply should have enough current for the total load. A 1-amp rating is probably fine.

Here is a link to a discussion about this that will help:http://www.soundonsound.com/forum/showflat.php?Cat=&Number=679914&Main=679565 A 9 volt A.C. 3.2 amp power supply should work for you. Just remember A.C. not D.C. is required.

If it is the adapter, check, it is also sometimes, where it enters the plug, the cable can break here again, wiggle and check, if the PSU IS faulty, best to check with meter, but if sure obtain another, PSU, that has the same specifications or better than the existing one, and you can use this, often the Plugs, aren't the same, these can be "Grafted" onto the New supply, there is only two connections, always the Outer braid, wire, shield, is negative-, earth. The Other one, is always Plus, Positive -. and usually always goes to the Middle PIN in the PSU Socket. If you look on the unit, you will see.. A Power IN, usually, say 90 V - 250V AC, and the other DC reading maybe something like. 19 Volts DC & 4.5 Amps DC. So you need a replacement supply, that works on your mains supply, outputs 19 V DC, and is able to supply a Current, of 4.5 Amps The same, OR MORE, but not Less. will work. Current, is what "Does the work" so this must always be more, the Voltage can be within, 25% and still be OK, if Current is higher. If the wrong adapter is used, as long as it is NOT too, higher voltage OVER, what it requires, this will NOT do any harm. The extra VA, will be dispersed as heat. If too little, again no harm, it will simply not work.

The Boston Acoustics power supply that came with Model 7000596 speakers is rated:
Input 120VAC 60HZ 23VA
Output 12VAC 1500mA (1.5A)

The PS model number is WK1201A5-1AN