1. Since you ask about Hertz I'd suggest PMing Gunbir/Autophile and asking them where you can listen to them. Hertz can be as bright as JBL if you tune it so. I heard one install that was too bright for my tastes but my tastes are not nromal.
2. If we pre-program everyone to expect a particular sound from a brand it would be dis-service. it would limit un-biased auditioning. I would hence suggest that you listen to as many brands in as many installs as possible. I learn something new from every car I have heard and that includes OEM systems.
3. Hertz (I think) has 4 or more lines/ranges of speakers suiting varied budgets and tastes. The best is the Mille range.
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