Emerald Physics Open Baffle should be a match made in heaven. I have 3.4s with upgraded passive XOs. The driver is 12" with 1" concentric polyester tweeter. It’s ~ 99dB efficient which should make your 40 wpc amp very happy. If you need more bass, consider the 2 series+ which come with either one or two 15" carbon fiber woofers per cabinet. If you go this route and they have the OEM jumpers, I upgraded to Wire World OOC: the improvement was not subtle
They are no longer in production. I have seen people selling them for ~ 20% of MSRP
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They are no longer in production. I have seen people selling them for ~ 20% of MSRP
hth