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Old 20th August 2011, 02:13 PM   #1
diyAudio Member
Join Date: Aug 2011
Default Hopefully an easy one for you...

Hey everyone,

after looking through the forums for countless hours now, I've resigned to registering and posting my own problem as I can't help myself. Hope you guys can if it's not too much trouble. Also, I don't even know which section this would come under - all this new stuff I'm learning is making my head spin and I'm thoroughly confused. If someone could move it to the right section I'd be very appreciative.

Anyways, on with my problem. A year or 2 ago I was the recipient of two Radio Shack Optimus speakers. These ones to be precise (you may notice a few links in this post, I'm just trying to provide as much info as possible ):

Radio Shack 12-1736 Optimus 10" 2-Way Stereo Box Spkrs | eBay

I have been using them occasionally with a housemate's Denon PMA-350SE and Technics SU-600 (eBay link for the Denon and service manual for the Technics below).



They sound great, so I was swayed to set them up for daily use. But obviously I needed to get my own amp. I invested in this:

New QTX Sound SA-2 / SA2 DJ Stereo Amplifier 100W | eBay

I know it's not the best one out there, but I purchase it mainly due to budget constraints and the fact that it went very well with my other blue, blinking gadgets so I took it. I've hooked it up to my PS3 and PC and get absolutely superb sounds out of everything, but it's much too loud. I'm talking, raise it up 2 marks from its absolute minimum and that's starting to get relatively loud. Not unbearable, but I would like the option to have it a couple decibles lower. I've adjusted all volume settings elsewhere, and have managed to adjust the PC to a comfortable setting, but when playing stuff through my PS3, I'm still deafened. My PS3 is connected to my TV through a HDMI cable, then there's an RCA cable from the Line Out ports on my TV to the amp. Silver Audica cables run from the amp to the speakers, but as they're also inherited, I have no idea of the model number or anything. Apologies.

So, my questions are as follows:

First off, is this even a suitable amp for my speakers? Is my setup OK in general?
Secondly, when I power on my amp I get a loud hum, which fades and then no unwanted noise. When I turn them off, I get a minor thump sound. I looked this up and I'm just lost again. One forum told me it was absolutely normal. Then I stumbled across this:

speaker thump /amp-on question

Can someone reassure me on this matter or persuade me to go along with what was said on these forums as I'm trying to refrain from using them at the moment.

Thanks in advance for any help you guys might provide me with. I've completely given up with trying to teach myself anymore!

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Old 20th August 2011, 02:26 PM   #2
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
Join Date: Nov 2005
hello Mikey, and welcome

many members probably don't read the introduction threads

in your own interest it would be better to post specific question in other threads

good luck


Originally Posted by jiinyus View Post

Can someone reassure me on this matter or persuade me to go along with what was said on these forums as I'm trying to refrain from using them at the moment.

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Old 20th August 2011, 02:30 PM   #3
diyAudio Member
Join Date: Aug 2011
Thanks for the speedy response! Any suggestions as to where this would be better suited?

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Old 20th August 2011, 03:39 PM   #4
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jacco vermeulen's Avatar
Join Date: Oct 2004
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Solid state forum ?

Too loud is better than not loud enough (the amp does a mere 15W continuous in 8 Ohm)

Euh, Hi di Ho there.
It doesn't count how one deals with winning, but how to handle a loss (© DjT)
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Old 20th August 2011, 04:33 PM   #5
diyAudio Member
Join Date: Mar 2007
Location: Canandaigua, NY USA
Without reading everything (so I may be off base) you may be able to solve this with a couple simple voltage dividers at each amp input. You'd need 2 RCA plugs, 2 RCA jacks and 4 resistors. You could also just use trimpots to make it adjustable. Can you solder stuff?
I may be barking up the wrong tree, but at least I'm barking!
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Old 20th August 2011, 04:41 PM   #6
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Michael Bean's Avatar
Join Date: Sep 2004
Location: Minneapolis, Minnesota, USA
Is there a volume setting option for the TV out? If not, this thread might be helpful:

DVD/CD Audio Out Control ?


Last edited by Michael Bean; 20th August 2011 at 04:46 PM.
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Old 21st August 2011, 02:12 PM   #7
diyAudio Member
Join Date: Aug 2011
Thanks for the help everyone, I really appreciate it. I'm going to repost this in another section and when I don't have work I'll look into everything and bug you with more questions. =P

Cheers again,
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