Amen to that; 1 watt can be too loud!Believe it or not, 5 watts is loud as well
Simple DIY (search for "10% Power" -- note that 10% power is only half the perceived volume)
More sophisticated DIY
I suggest the M2 shown in the 1st post, without the stuff in red along the bottom if you don't need a 16 ohm connection; see post #539 on p. 27 -- note that this design will effect up to 31 dB reduction in discrete increments, or about 1/8 perceived volume, and if you don't need an attenuator that can handle a 50 W amp, you can reduce the wattage [and thus size] of the resistors -- will need to have a sign-in for the Marshall Forum to download anything or view images at larger size.
Commercial ($180 US) Nice but more pricey.
Amp project with your favorite preamp design and low-power output tubes (EF80) -- search for "Micro Amps". There are build/discussion threads for many of these, both on TDPRI and other forums.
The nice thing about an attenuator is that it can be used with any amp it supports the ohmage and power of, so quieter for home, louder when you want that.