I have an old, "conventional" stereo receiver (a Sony STR-D360Z,
manufactured circa 1997).  Attached are the usual variety of devices
... TV, cassette deck, CD player, VCR.  Also attached are two pairs of
front speakers, one pair attached to the "A" outputs, the other to the
"B" outputs.  (The "B" outputs actually run via speaker wire into
another room and are terminated in two RCA jacks, where I plug in the
second pair of speakers.)

The unit itself has independent toggle switches for the "A" and "B"
speakers; using those toggles, either pair of speakers can be
independently turned on and off.  (Obviously, with both speakers on,
volume on both is slightly reduced.)

Due to a recent remodeling project, the jacks for the "B" speakers are
now buried inside a cabinet which cannot conveniently hold the
speakers.  I had the idea of turning the second speaker set into a
wireless system, so I bought a cheap set at Home Depot (Promowide
SP1290).  The unit comes with a base transmitter with a mini-jack
input (and a mini-jack to 2-RCA connector).

I can hoop up the wireless system to my jacks and get sound just fine, once
I enable the "B" speaker.  However, if the "B" switch is on, the "A" 
speakers will not work, regardless of the position of the "A" switch. 
That is, it seems impossible to drive both the wired and wireless
speakers at the same time.  If the "B" switch is off, the "A" speakers
will work as before.  (And, incidentally, the headphone jack on the
receiver works in all situations.)

Ideally, I'd like to be able to drive both sets of speakers
simultaneously.  Is it possible to do it with this set of equipment? 
Or, indeed, with any equipment?  I am willing to consider upgrading my
stereo, which I am otherwise happy with, but I'm not sure how much
money this "feature" is worth to me.

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Clarification of Question by jkhuggins-ga on 19 Mar 2005 13:18 PST

The comments below solved my problem.  Thanks.

I don't see anything about the Promowide on Home Depot's site, but
there are basically 2 types of outputs from a standard stereo
receiver: speaker level and line level.

The fact that you used to plug in your remote speakers using RCA jacks
is a little unusual. This is a high-level signal capable of powering
the speakers. RCA jacks are usually reserved for low-level signals
that need a power amplifier to power speakers.

Evidently the Promowide is designed to accept high-level signals (or
else it would distort terribly and/or burn out when you plug your
speaker wires into it), but it may also accept line-level input. (This
would be more typical of an input connection using RCA's or
mini-plugs.) Try running a stereo RCA cable from the Tape Out jacks to
the Promowide. Note that the Tape Out runs at full volume and is not
controllable by the receiver volume control, so this is not going to
work unless the Promowide has some way for you to adjust the volume.

Oh, and many modern receivers have remote speaker outputs that (a)
work at the same time as the main outputs and (b) allow you to adjust
the volumes separately.