Nicknac, Tubes and tube socketts are not friends of moisture, esspecially if it's salt air.
I know from experience being on a boat space is a premium, your speakers are good quality in a small package and efficient at 90db.
This Cambridge Audio who make good quality gear have a CDP + DAB radio, SD card, I-Pod, MP3 and USB inputs as well and is a 30w amplifier all in one compact package with remote just made for your speakers and a boat. Plus it has subwoofer line out on the back, if you can find a compact active sub for more bass, as your speakers have limited low frequency response
http://www.cambridgeaudio.com/products/one-cd-player-and-dab-receiver
Cheers George
I know from experience being on a boat space is a premium, your speakers are good quality in a small package and efficient at 90db.
This Cambridge Audio who make good quality gear have a CDP + DAB radio, SD card, I-Pod, MP3 and USB inputs as well and is a 30w amplifier all in one compact package with remote just made for your speakers and a boat. Plus it has subwoofer line out on the back, if you can find a compact active sub for more bass, as your speakers have limited low frequency response
http://www.cambridgeaudio.com/products/one-cd-player-and-dab-receiver
Cheers George