z130BT noise floor audible with internal amp ?

[JohnK]

I have a z130BT installed in my car and for now am using the stock internal 18wx4 amplifier.

 

When I play SD or USB source (and I'm pretty sure DVD too) and have the volume up in the 17-18 range I can start to hear a noise floor.  It's pretty low but is still discernable when the source material is completely silent or during the "mute" moment while changing tracks.  The specs say S/N ratio is 79db which isn't great.

 

But before I go out and buy an amp to use the pre-outs, I'd like to confirm this that the noise floor I am hearing from the internal amp is normal.

 

Thanks.  John

[pionara]

does your car have in inline amp?

 

according to the owners manual, the amp s/n ratio should be much better:

 

Power output ............................. 14 W RMS × 4 Channels (4 W and ≦ 1 % THD+N)

S/N ratio ....................................... 91 dBA (reference: 1 W into 4W)

[JohnK]

No inline amp that I know of.  I still have to get the radio antenna amps connected though ... maybe that has an effect on it?

 

I see the 91dBa spec -- don't know where I got the 79 from ... I must have spaced and been reading the wrong PDF file (although I downloaded the z130 specifically ... hmmm).

 

I'll check individual speaker outputs to see if there is a difference.  Eventually I plan to install an external amp so if I can't solve this minor annoyance sooner then it will be solved later.

 

But those of you who are using the internal amp on this unit hear no noise floor at vol.20 ?

 

Thanks.  John

[JohnK]

(moved to new thread)