Yes, that is correct a punch75hd can push 2 15 inch subwoofers
yes, you can do it but you have to have a custome box built and mabe a shallow mount subwoffer.
One of the most popular subwoofers that are high quality are Pioneers. They have been making audio equipment for a long time and their products tend to last for years. Another good product is JBL.
You would need Four DC Audio 7.5k for 15 Digital Designs 9918Z 18 subwoofers.
No, if you read online you can do it yourself.
Yes, they are just as easy as any other subwoofer.
You can but it probably won't hit that hard. I don't know the subs rms but if there 15s should be atleast 800 to 1000 rms . Get 1 Audiopipe 1500 monoblock . That will push them
14 inch wheels fir 14 inch tires, 15 inch wheels fit 15 inch tires. The difference is 1 inch.
New tires with the size 15 inch will fit 15 inch rims perfectly.
No. You can not put 16 inch tires on 15 inch rims.
You cannot mount a 15 inch tire on a 15.5 inch rim.
1 inch = 2.54cm 15/100 * 2.54 = 0.381cm
1 inch is 25.4mm. I assume you mean 15/16th inch, because that is common terminology for inch. 25.4 / 16, x 15 gives you 23.8125mm.