Car speakers for Almeran16 2001

Helo to all Almera members!!
I am new to the site.

I have a Nissan Almera N16 2001 model and I must change all 4 speakers because they do not sound good, they all old factory speakers and brocken.

I changed before 7 years the radio cd with new one
Sony xs gtx420u which delivers output power 4 x 52 watt peak power,
and 27 x 4 watts rms. The following information is from sony web site.

Now I want to ask you two questions

1. What size are the door speakers ? Are they 6.5?
2. I found Alpine sxe 1725s 6.5 inches, to replace all 4 speakers, front and rear.

Their specs are 40watts rms, sensitivity 92db, you think they are ok with the radio cd?

I will not put external amp, neither sub.

Thanks in advance
 
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