I have been thinking about upgrading some of the speakers in some of my games, mainly Stern (Kiss, AC/DC, Metallica). I rather avoid some of the pinball speaker companies and find some cheaper options on Amazon.ca, etc. Any suggestions for upgraded speakers you can buy directly in Canada? Are there any specific requirements for pinball speakers (ohms, etc.)? Please feel free to post any links of speakers you have used or recommend. Thanks for the help.