I think you mean 30 watts, but yes I would hope that 30 amps is plenty loud enough.
If you want better distortion and sound quality, you will have to ditch the 'vintage' part of your criteria. 'Vintage' audio components tend to have high distortion erratic frequency response.
If you want a large bookshelf speaker with very good bass extension, check out the
BMR Philharmonitor. A bit pricey but outstandingly accurate loudspeaker. If you want a good bookshelf speakers but don't want to spend 2k on a pair, check out the
K-BAS bookshelf speakers from Monoprice, very good bookshelf speakers with tower-speaker like bass extension.