No, they certainly don't sound anything other than loud. You're entitled to your opinion, but there's a reason that no one who actually cares about an accurate system or really anyone who cares about anything other than being obnoxiously loud, uses anything made by Beyma. They simply are not high fidelity drivers. They're efficient, that's it. If you judge quality solely on quantity of output, they'll do but doesn't qualify them as quality drivers for people more concerned with accuracy and tonality and less with ear-bleeding output.
And 70hz is still too high. Definitely too high to consider for a good midbass presence as a dedicated midbass in a 3-way front stage. Midrange output is totally secondary in that application, you'll have a dedicated midrange for that. If you're going to the trouble of putting 10s in the doors, get the full benefit of the cone area and the benefit that it can give you in getting good output in the lower freqs. I have 6.5s that I run without a high-pass filter and don't have a problem with playing down into the low 30s. I can turn the sub off and the difference in with rock music isn't that pronounced. If can't do that with a 10" driver, you've wasted you time installing them.