Actually, I agree it will lack bass frequencies - with the stock speaker. But with either a Greenback or Vintage 30 (or an old 8-ohm CTS I tried) it had plenty of bass. The stock speaker has a very weak low end. Also, changing the mix resistor (R16) to a lower value both balances the channels a bit and improves overall frequency response in both channels. But that C19 cap definitely has to go! It just strangles the hot channel - I think they were trying to get a rolled-off "woman tone" type sound when the amp was cranked, and it does that to a point - but it just ends up very muddy. removing that cap is like taking 10 blankets off the amp.