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ordered the DX3 pro+ when it was on sale, will be using it with HD6XX’s and streaming from my iPhone mostly Amazon HD. What quality can I expect streaming this was and are there options to improve it?
The DX3 pro+ supports 'hi-res' codecs LDAC (<=900kbps) and AptX HD (<=576kbps) with 96kHz/24-bit & 28kHz/24-bit respectively exact specs will depend on the device. It also supports a number of other codecs such as AAC. iPhone however supports only AAC (250kbps). All codecs use some form of lossy compression. AAC is supposed to be equivalent in quality to a mid-bitrate encoded MP3. https://www.soundguys.com/understanding-bluetooth-codecs-15352/
Whether you will be able to detect a significant audible difference is another question...
As for options to improve bluetooth... you could look at accessories such as a bluetooth LDAC receiver but possibly only marginally less clunky than a wired connection