I'm no expert on speakers so I can't really recommend any brands, but if you are suffering hearing loss that makes it difficult to understand speech, then my guess is that you've lost the ability to make out higher frequencies. Do vowels sound clearer than consonants? You'll probably want speakers that favor higher frequencies, or "brighter" sounding speakers. Alternatively you can experiment with a multiband EQ (I'm sorry if you've already done this). If your receiver allows you to adjust the gain of various frequency bands try turning up the 1kHz and higher frequencies (probably getting higher the higher you go) and turning down the lower frequencies. This might serve to compensate some of your hearing loss. The TV might sound a little harsh to other people, but you might be able to get by with a quieter total volume.