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Got stung by the Upgrade bug Just got a pair of these mono-blocks, for a good price in local CL. This is my first tube amp, Will be driving my VR-4's Gen 1's. Was actually on a look out for a medium powered tube to power the HF in my bi-amp setup. I can vertical bi-amp the VR-4's with Apollo's but I'm really happy with my JBL/UREI 6290 amp, dual mono design with 300w @ 8ohm and 600w @ 4ohm. Controls the bass really well. So for now the Apollo's will just be driving the HF in Triode mode. Sounds like an overkill, but I'll see how it works out.Haven't hooked it up yet. Any one on here have experience with Apollo Dark or the early apollo amps?
But I read the flagged post about bi-amping. And the manufacturer is recommending the same kind of setup (hi current solid state for LF and tube amp for HF) as I have now. Never heard anything about timing error. Is it something to do with audio signal slightly lagging from one of the amp to the speaker?
Check the input sensitivities of the amps. This means how much voltage is required to drive the amps to full output. If they don't match, that's where the timing errors come in. Say bye-bye to the JBL amp. I have heard VonSchweikert's driven by the smaller Rogue monoblocks and they performed quite nicely.
Holy crap! Nice CL score. I’m shopping used medium power tube monoblocks to power the HF section of my VR-4 Gen III HSE. I have a pair of 1000W DIY ICEpower monoblocks bi-wired now. May I ask what amps you were looking at? I’ve been focused on 60W Dynaco Mark III although 60-90W Quicksilvers have recently caught my eye. The VTA M-125 looks very nice, too.Martin
The input sensitivity of the JBL is listed as 1.1v @8ohm, since it just driving the LF it must be operating at 4ohms. The Apollo's input sensitivity is listed as 1.0v RMS. Is 0.1v enough to create an unbalance? I've been listening to it and do feel the HF is slightly louder at the same volume level as compared to my Yamaha M80 which was previously driving the HF.Also if I'm to drive VR4's just with the Rogue monoblocks in vertical bi-amp setup. Which pot should I use from the amp, it has a 4ohm and 8ohm in the back. I know the VR's HF are 8ohm and LF are 4ohm.
I am bi-amping a pair of VR 7 HSE speakers and I have used a pair of Lumley Reference 120's (120 w/channel) or a Decware Torii II (25watts) on the HF. I have a Proceed BPA-2 on the LF. I use a Tortuga LDR3V.25 passive pre and find the impedance matching of the Tortuga works excellent in this setup. I don't hear timing issues. Just a wonderful sound.When are you going to hook up the Rogue Apollo Dark?
Avinash,The potential issue with using different amplifiers in a biamplified system is not due to different gain levels or sensitivities. It is (again potentially) due to different propagation times for the different amps. In other words, how long an amplifier takes to process the signal from the input terminals to the output terminals.I'm driving VonSchweikert VR100XS system using a pair of Lampizator True Balanced 211 Monoblock amps to on the midrange/tweeters and a pair of Spectron Musician III Mk2 monoblocks driving the woofers. The XS subwoofers get their signal from sense cables attached to the woofer inputs, integrating the bass input signal and the backwave EMF from the tower's woofers.I've used other combinations of amps on the top and bottom of various speakers and in every case the combined strengths of the different technologies were far superior than biwiring with a single amp. In my system, the 211's bring excellent time coherence, detail, and timbre resolution. The Spectrons provide essentially limitless power (I've never heard them sound stressed), very high damping factor, and extremely extended bass response. As the saying goes, horses for courses.Best,Robert
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