Single speaker, center dash

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

WFO

Full Access Member
Joined
Jan 6, 2017
Posts
3,380
Reaction score
4,419
Location
Texas Panhandle
First Name
Dan
Truck Year
1986
Truck Model
K20
Engine Size
350
I've never seen an FM radio with a single speaker.
Does the knob behind the station knob turn from right to left, and if so, is there sound when turned all the way in one direction, but not in the other direction, while in FM mode?
 

78C10BigTen

Full Access Member
Joined
Apr 12, 2017
Posts
15,475
Reaction score
23,681
Location
pennsylvannia
First Name
Ted
Truck Year
1978
Truck Model
C10 BIG TEN
Engine Size
350
I've never seen an FM radio with a single speaker.
Does the knob behind the station knob turn from right to left, and if so, is there sound when turned all the way in one direction, but not in the other direction, while in FM mode?
It turns freely but dont do anything
 

idahovette

Full Access Member
Joined
Aug 7, 2016
Posts
6,451
Reaction score
13,782
Location
Weiser Idaho
First Name
Perry
Truck Year
1975-1979
Truck Model
K20-K10
Engine Size
350
Got an AM/FM that I ordered in my 75 K-20. Single speaker and the right adjuster knob turns free(kinda it's almost 43 years old)
 

WFO

Full Access Member
Joined
Jan 6, 2017
Posts
3,380
Reaction score
4,419
Location
Texas Panhandle
First Name
Dan
Truck Year
1986
Truck Model
K20
Engine Size
350
I reckon they did make mono FM radios, then. I thought maybe a previous owner had replaced an AM with an AM/FM, and hooked it up to the AM speaker.
 

75gmck25

Full Access Member
Joined
Oct 13, 2016
Posts
2,017
Reaction score
1,808
Location
Northern Virginia
First Name
Bruce
Truck Year
1975
Truck Model
K25 Camper Special TH350 NP203
Engine Size
5.7
The reason that specs for many replacement speakers recommend using them only with aftermarket radios is that the speaker resistance on the old radios was different. Old 70's and 80's OEM radios used 8 ohm speakers, while most newer radios are designed for 4 ohm speakers.

You can mix and match speaker resistance up to a point, and it might only affect the volume. However, the output amp in the radio is matched to speaker resistance, so a mismatched speaker could potentially overheat the output amp and burn it out. This is the same reason the docs usually tell you to never run the radio without speakers attached.

Bruce
 

Latest posts

Forum statistics

Threads
41,850
Posts
903,469
Members
33,362
Latest member
Dhatch84
Top