"what is the difference between the Sonos re clock mod and what you are selling?"
Modding the Sonos will certainly improve things, particularly if you replace the clock and the clock power supply. I used to mod more than 40 different products from 1990-2009. Many are still in use. However, if I though that modding the Sonos was the right approach, I would be doing that, but its not.
The low jitter that you can achieve with an external reclocker with a custom power supply is jut not achievable with mods. Mods have the disadvantage of using the existing infrastructure, boards and power supplies and even the same power outlet. You are faced with too many compromises. Doing the master clock in a separate reclocker has no compromises. The designer has complete control over everything. Putting the clock in the reclocker like the Synchro-Mesh on a separate AC outlet is even a big win for performance.
There is very little risk in trying a Synchro-Mesh anyway. You can get all of your money back, less shipping if it does not knock your socks off. Try to get your money back on a mod. I don't think so....
We sell direct only, to minimize the cost to customers.
Its not that ANY DAC will do, but most DACs will sound wonderful with a low-jitter input. DACs are a personal taste thing, and a system thing. Every system has its quirks, so matching a DAC to the system is sometimes in order. If your system sounds a bit harsh, then maybe a tube DAC is best etc.. Its also a matter of budget and expectations. If your budget is low, then maybe a Concero for $700 is the ticket. If you are a perfectionist and want to get as close to vinyl as possible, then maybe a $20K dCS. Every one of these needs a low jitter digital source to sound best.