Stereo Preamp suggestion


I intend adding a Stereo preamp with HT bypass and subwoofer out to my setup below
KEF R900 mains
KEF R600C Center
KEF T301 surround
Pair of SVS SB3000 Subs
Mains are connected to Parasound A21+ poweramp and the rest is connected to Marantz AVR 7011.
Im looking to get a stereo preamp with HT bypass so as to enhance the music listening experience.
Any thoughts on which brand/model of preamp I could go for considering that I want the subs also to be activated while listening to music. 
I am looking at the following models of Stereo Preamp:
1. Parasound P6
2. Parasound JC2BP
3. Anthem STR 
4. Rotel 1590 MkII

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A budget number would be helpful.  I used a Modwright LS100 until recently and have since upgraded to a Herron VTSP-360 Reference.  Both have HTBP. 

My subs are active for both stereo listening and home theater.  Many preamps have more than one set of outputs.  You will give up the subwoofer correction from your AVR, but if you run enough subs (I have 4, 5 for HT), it won't matter.
I’m not 100% positive but I think for what you are trying to do only the parasound p6 or anthem str will actually do what you want. I believe they have HT bypass for the RL speakers as well as subwoofers. I had the P5 not the P6 and found it really to be not much better than the marantz prepro I used for HT in regards to 2 channel music. The anthem STR is probably my vote out of the 4 because it has the features you want and will sound better than the parasound but it is over double the price.
I have to agree with last two posters. The Parasound P6 is just want you want to integrate 2.1 with 5.x from AVR. I had the P5 and now P7. The subwoofer can work with both.  I use Roon and DSP for 2.1 and anthem avm60 arc for theater. Best of both. 
Parasound P7 is worth consideration here, as many listeners, including me, believe that its sound surpasses that of P5, P6, or HALO integrated’s preamp section. The P7 has only one sub output, but you can use a y-cable to split that output for use with two subwoofers. Since the P7 is discontinued, Parasound cut the price in half, making it a great value too.