Can someone give me some info on this old Optimus amp?

[justafifteen 10+ year member]

Just picked it up at a pawn shop for 15 bucks. Catalog # 12-1976

All I could find out is that it's 4x25rms, but could someone give me any more detailed info? such as ohm rating & etc? Here's a pic I found online

Thanks guys //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Click to read more...

 

[justafifteen 10+ year member]

Anybody?

 

[kr15 5,000+ posts]

I think that might have been Radio Shacks brand or something back in the day. I had an older "100x2" that seemed fairly strong. Im sure it does rated, but as to your exact model, im not familiar

 

[justafifteen 10+ year member]

Yeah it says on the sticker on the bottom that it's radioshack's brand. I'm just looking for some more info on it. The manual doesn't really give much info. I know that they're fine for my front stage & my stock rears but yeah just looking for more info

 

[DBfan187 5,000+ posts]

iirc 10%THD

 

[kr15 5,000+ posts]

whats the fusing on it?

 

[Spooney 10+ year member]

get us some pics of the internals. My very first amp was a radioshack 25 x 2 . My buddy has a radioshack amp thats rated for like 170 watts peak I think but it has some balls for what it is.

 

[modskwod 10+ year member]

iirc 10%THD

It may say that, but it's more than that. I have a 4 channel and while it may put out rated, it sounds like complete ass IMO.

 

[justafifteen 10+ year member]

I'll get an internal shot tomorrow, but it has a 10A fuse, so I know it's not putting out more than 120w. And yeah the manual says 10%THD. We'll see how it sounds after I find some spade connectors

I picked this up because even if it didn't work, it was only $15 down the drain. But the question I suppose I should ask is, would I be better off using this to power my speakers or leave my HU powering them?

 

[Spooney 10+ year member]

I think you would be slightly better using the amp but not so much that it would be worth the trouble of installing it. If the amp isn't functional let me know and I may take it off your hands. I like old shit like this for some reason

 

[edzy 10+ year member]

x 25 Watt Trunk Mount Amplifier

(120-1976) Specifications Faxback Doc. # 16987

Output Power @ 14.4 VDC 1 kHz 10% THD

Front:...........................................................25W X 2

Rear:............................................................25W X 2

Frequency Response:...................................20-20,000 Hz (+/-3 dB

Input Impedance

Low Input:......................................................10 kOhms

High Input:.....................................................100 Ohms

Input Sensitivity (for 10% THD Output Power)

Low Input:........................................................150 mV

High Input:........................................................2.5 V

Power Supply Voltage:....................DC 14.4V Negative Ground (10.5-16V

Maximum Current Draw:...................................................10A

Matching Speaker Impedance:...............................4 Ohms or Greater

Fuse Requirement:......................................................10 A

Dimensions:..............................2 1/4 X 7 1/4 X 8 1/8 Inches (HWD)

(53 X 200 X 210 mm)

Net Weight:................................................3.7 lbs (1.7 kg)

Specifications are typical; individual units might vary. Specifications

are subject to change and improvement without notice.

 

[edzy 10+ year member]

btw, thats my amp you stole the pic of....

 

[jdawg 5,000+ posts]

they were made by pyramid

 

[justafifteen 10+ year member]

btw, thats my amp you stole the pic of....

Haha sorry about that man. They were the only pics I could find off of google!

 

[edzy 10+ year member]

acually, optimus was its own brand speced out by radio shack. alot of them were built in the same house as Sanyo amps. But they were never rebranded amps from any other company.

Some stores would have mps made for them, like the Mmats made, The hot set up. But radio shack produced thier own line to sell at RS.