I have a pair of Hitachi speakers probably off of a portable stereo that i want to hook to my pc, I hooked them up and they work but the volume level is very low I think they were powered by the stereo they came off of, Is there any way to fix this?

This could be due to the systems overload protection kicking in, which under normal circumstances shouldn't happen, I suggest moving the speakers next to the amplifier and if possible use anew piece of wire to test the speakers start with one and test each individually. I think you possibly have a small short in one of the wires. Or one speaker is damaged. Measure the resistance between each speaker wire pairs. The speaker will probably be either 4 or 8 ohms check that this is the case. Read the speaker labels for clues. Were they the original speakers supplied? by the same manufacturer?

If you are using the Bose Equalizer to optimize the sound of the 901s by going through either a tape loop or a pre-out/main-in loop, then the only way to do this without also equalizing the sound sent to the second set of speakers is to manufacture a "zone-2" output from the Luxman.
You'd probably need to split the send from the Luxman's pre-out before the EQ and send it to a second power amplifier for the second pair of speakers (if you want the Luxman's volume knob to control both speaker sets) or from a tape level output (if you wanted independent volume controls for the two speaker sets.
The whole EQ thing made 901s difficult to use on vintage equipment with only one "zone" audio outputs. Unless you want to use the Bose EQ on the second set, too, you can't do it satisfactorily without adding another stereo amplifier. But, go ahead and try it, you might find that you actually like the odd EQ that the 901s EQ gives to the second pair!
If it were my decision, I probably would not do it without a second amp, but it's all about what you like, my opinions really don't matter in your house, do they?
Have fun

Go to menu options and turn speakers back on, unmute and turn volume up.

Try whatever applies best below, in order...

Cable Box optical Digital Audio to Digital Audio In. (This brings TV-related multi-channel and normal audio into the receiver so you can hear it over the speakers. Turn TV volume OFF.

The cable box probably has a pair of stereo Audio Out RCA jacks. Run those directly to the TV so you can watch and hear cable programming over the TV's speakers without having to turn the system on. Turn TV volume UP.

Depending on your TV's Video In capabilities, use the Cable Box HDMI, Component (Red, Blue and Green), or Composite Video (single Yellow associated with the Audio Out) directly attached to the TV.

I presume you realize none of these things produces speaker amplification. A receiver would do that and facilitate graceful and simultaneous interconnections. But it's not a necessity for selective interconnective between them, just not all at the same time.

I can't find any details on anything you named except the Tuner.

Typically, the tuner would use an RCA pair to go to a receiver AUX, TUNER or other Line Level input for source selection and amplification. Lacking a receiver, run it to the Tape Deck inputs for recording.

Ditto for the CD changer, but you'll probably have to disconnect the tuner.

Since you have it hooked up to the stereo system, you need to go to on screen audio set up and turn off the TV built-in speakers (you will be listening the TV sound through your stereo system speakers), then go to the audio output set up and set it to 'variable' so the audio output of the TV's RCA audio out put will vary with the volume control of the TV (not all TV will alow this function), you will need to set the stereo volume to certain level (around 9~10 O'clock setting) since the sound coming from the TV will be controlled by the TV remote volume control. You can otherwise set the TV output to be at 'fixed' level, which means the sound output of the TV will not be controlled by the TV remote volume control, you will use the stereo remote volume control to adjust the sound level instead. I hope this is clear to you.

You want them to be your Main Front speakers, right? The news is not good.

There will be some limitations because you can't extract 'processed' L-R from this receiver. The following will give you good stereo and Front L-R from the 901's but it won't allow central volume control or send them any of the DSP effects you may select. Sorry. If it had a Front L-R Pre-Out you'd be good to go for all functions and listening modes.

You'll need a separate stereo amplifier WITH ITS OWN VOLUME CONTROL for the 901's to accommodate the need for the Active EQ. Modest amps would work but at very loud volumes may go into clipping, which is bad for any speaker. I'm using only 100W for mine and it has plenty of steam for the 901's.

With this receiver we have to cheat to get the Front L-R signal out to the 901's (but it's unprocessed and at a steady volume level)...

For connection I would run a pair of RCA cables from the VCR/DVR Audio Out L-R OUT jacks (*) to the Active EQ's Line IN; then the EQ's Line OUT to a separate amp's Line IN. Attach the 901's to the new amp.

* You'll lose the ability to use these jacks for anything else, but few of us use them anyway. DO NOT select this function for monitoring or you lose all audio in the Onkyo.

Does your tv have stereo outputs? if yes all you have to do is run RCA red..white jacks into tv outtput then run the other ends into the amps tape or aux or cd input and your done! If you dont have outputs on tour tv you will have to but an RF converter box (about 20.00 at wal-mart) and hook that into the tv and the cables will run out of that to the stereo!

You'll want to turn of the TV speakers in the Remote Menu and try turning up the volume level of the TV, which usually controls the level of the RCA outputs, as well

1)probable incompatibility issue--for comparison did you try a set of headphones? 2)The RCA audio outputs on the tv can go to an amplifier that has speakers attached,ie surround sound. 3)Caution==never try to alter vol level at spkr!