This may be a funny question but coming from speaker setups where we often advocate the use of separates - as in splitting up USB, DAC, Pre-amp and going monoblocks - I've noticed many headphone amps are sold as an integrated (with pre-amp built in), even top of the line products. I've only seen woo audio having a monoblock design. Is there any reason why this is so?
The only thing I can think of is that it isn't required since the amplification is relatively low (in comparison to speakers) and therefore interference is potentially less, so the gains might be more marginal..
Has anyone had experience in pairing their higher end stereo (speaker system) gear to headphone amp, and heard if there is any difference vs integrated? e.g. existing DAC + pre-amp, then adding on a pure headphone amp to headphones?