AIWA XR-EM20 CD player

Without more information it's difficult to answer your question accurately.

Try a universal remote which has been set up to work with your audio system.

Or, read the manual and find out how to access the bass controls on the front panel. I know nobody likes reading manuals, but sometimes they tell you what you need to know - you just might have to dig in and find it.

This was easy.. download the manual here:
http://www.nodevice.com/download/user_manual/aiwa+xr-em50.html
From the manual:

Clock Adjustment: (Page 7)

Setting the clock
1 Hold down SHIFT and press CLOCK on the remote
control.
When the unit is turned off, you can also press SET.
2 Within 6 seconds, press "< <" (rewind icon) or > > (fast forward icon) to set thetime.
Each press changes the time in 1-minute steps.
Holding these buttons down will vary the time in 10-minute
units.
3 Press SET.
The time display stops flashing and the clock starts from
00 seconds.

When setting the clock on the unit in stop mode, hold down
"square" (stop icon) and press "> >" in step 1. After setting the time in step 2,
press TONE in step 3.

To display the time while the power is on
Hold down SHIFT and press CLOCK on the remote control.
The time will be displayed for 6 seconds.

To switch to the 24-hour standard
Display the time and press s within 6 seconds.
With each press, the clock alternates between 12- and 24-
hour standard time.

Tip:
In the 12-hour standard, "AM12:00" indicates midnight and
"PM12:00" noon.
If the clock display flashes when the unit is turned
off
There has been a power interruption. Reset the clock.


Bass / Treb Adjustment: (Page 11)

1) Press BAS or TRE
2) Within 6 seconds, turn VOLUME (press VOLUME +,- on the remote control).
Each level can be adjusted from "-2" to "+5".

Good Luck!

First, check your software firmware version and see if there is an update. If available read your manual how to do a firmware update using your USB port, if you don't have a manual, check Bose.com for their online manual and firmware updates. I had a different problem but the firmware update solved it. Another tip to increase the depth of your bass, while doing the adaptiq process, cover your bass speaker with a pillow, this will make your bass more deeper. You need a second person to cover your bass module with a pillow. in this way, the adaptiq process cannot hear the bass sound and it will increase the bass. You might need to do this several times until you get the desired bass sound. If you have not setup using adaptiq, your better off not using adaptiq, the sound is much better. Hope this helps.

You may view the manual here. I don't know about getting a replacement remote. You might want to click on the "Live Help" link on that page to ask Sony (Sony now owns the Aiwa brand).

And how would we we would know if you have it set up right? There's not a lot of information here to work with.

What's "ENOUGH" bass? Many things play into bass in the listening environment beside the basic electrical connections. Web search for "subwoofer placement" as a start. I imagine the manual that came with it may address that aspect.

Web searches find answers to this type of question (so far = NO). But cruise the auction sites. Maybe one will appear.

Register and download the manual for free at retrevo.com

http://www.retrevo.com/support/Aiwa-XR-EM30-manual/id/1076dj487/t/2/

To adjust the clock. All you do is hold down the bass boost button untill the clock flashes, then use the volume button to adjust the time and the forward and reverse buttons to switch between minutes and hours. When your finished setting the time just press the bass boost button again to finish.

The picture is unclear what size that is but they make adapters for RCA-Stereo-Cable-pair-to-single RCA (Y-adapter) or to smaller 3/16" mono or stereo jacks.

The manual in case you need it. No guidance on operating the optional sub.

http://www.docs.sony.com/release/CXLEM20.pdf

Your unnamed sub's manual should have some advice, huh?