olds1959special Posted November 10, 2023 Share Posted November 10, 2023 I found another Hafler DH120! I’m now bi-amping my 2Ci’s with two Hafler DH120’s! 2 Link to comment Share on other sites More sharing options...
Boom Boom Posted November 11, 2023 Share Posted November 11, 2023 Nice! Can you describe any improvement in sound? My first preamp was a Hafler. I sold it and bought a PS Audio IVH. The phono stage in the IVH was good enough to work well with my SOTA Sapphire rig. I was running a Talisman Sapphire low output MC. The first amp I used with my Vandersteen 2Cs was an Acoustat TNT120. Hafler acquired Acoustat when they filed Chapter 11. Jim Strickland's Trans Nova designs were used in the upper end Hafler amps. I wasn't able to acquire a second TNT120 to bi-amp. Here's an old review of the Hafler Trans Nova amp using the Vandersteen 2Ces as one of the speakers used to evaluate: https://www.stereophile.com/content/hafler-transnova-9500-power-amplifier Link to comment Share on other sites More sharing options...
olds1959special Posted November 12, 2023 Author Share Posted November 12, 2023 3 hours ago, Boom Boom said: Nice! Can you describe any improvement in sound? My first preamp was a Hafler. I sold it and bought a PS Audio IVH. The phono stage in the IVH was good enough to work well with my SOTA Sapphire rig. I was running a Talisman Sapphire low output MC. The first amp I used with my Vandersteen 2Cs was an Acoustat TNT120. Hafler acquired Acoustat when they filed Chapter 11. Jim Strickland's Trans Nova designs were used in the upper end Hafler amps. I wasn't able to acquire a second TNT120 to bi-amp. Here's an old review of the Hafler Trans Nova amp using the Vandersteen 2Ces as one of the speakers used to evaluate: https://www.stereophile.com/content/hafler-transnova-9500-power-amplifier Cool, thanks for the link. The sound improvement for me is huge. Before I was bi-amping with different amps, but using the two DH120's together the sound is very well balanced and full, and also clean. Before I tried a Rotel RB-1050 amp (with the gain turned down to match) on the bass driver. But now I don't have the match the levels, because they are the same kind of amp. 1 Link to comment Share on other sites More sharing options...
Holmz Posted November 12, 2023 Share Posted November 12, 2023 Is there a left hand side (LHS) amp amd a RHS amp? Are you filtering b for the upper speaker inputs? Link to comment Share on other sites More sharing options...
olds1959special Posted November 13, 2023 Author Share Posted November 13, 2023 (edited) On 11/12/2023 at 3:40 AM, Holmz said: Is there a left hand side (LHS) amp amd a RHS amp? Are you filtering b for the upper speaker inputs? I tried both. I wanted to use one amp per speaker by putting them in mono mode, but for some reason I wasn't getting sound to both drivers on one side when I tried this. I wonder if the amp is faulty. They do sound good when in stereo mode though. I'm going to try them in mono again and see if I can get it to work. Edited November 13, 2023 by olds1959special Link to comment Share on other sites More sharing options...
olds1959special Posted November 13, 2023 Author Share Posted November 13, 2023 I just checked and I guess the second amp I got has a broken stereo/mono switch. 😞 1 Link to comment Share on other sites More sharing options...
Holmz Posted November 13, 2023 Share Posted November 13, 2023 You could always use a Y splitter in stereo mode. And go vertical… It would be cheap enough to try. 1 Link to comment Share on other sites More sharing options...
olds1959special Posted November 14, 2023 Author Share Posted November 14, 2023 (edited) 4 hours ago, Holmz said: You could always use a Y splitter in stereo mode. And go vertical… It would be cheap enough to try. Yea, that's what I'm doing now. I don't need a Y splitter cable because my pre-amp has two sets of outputs. Sounds good this way, but I wanted to try mono mode too, but I guess I'll have to fix that amp first. Edited November 14, 2023 by olds1959special Link to comment Share on other sites More sharing options...
Holmz Posted November 16, 2023 Share Posted November 16, 2023 Is there a switch on the back to bridge left and right? Link to comment Share on other sites More sharing options...
olds1959special Posted November 22, 2023 Author Share Posted November 22, 2023 On 11/15/2023 at 6:58 PM, Holmz said: Is there a switch on the back to bridge left and right? Yes but on one of the amps it’s not working. 1 Link to comment Share on other sites More sharing options...
Holmz Posted November 24, 2023 Share Posted November 24, 2023 Without the switch one could run them as vertical bi-amping. Probably best to run some HPF to the upper frequencies… even these Harrison Labs inline RCA jobs. 1 Link to comment Share on other sites More sharing options...
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