roninklipsch Posted March 3, 2023 Share Posted March 3, 2023 Wondering if it's possible to run main SS amp to low end and pre amp out of main amp to tube amplifier to run to high end? I would imagine I may need to tweak for gain perhaps but maybe impedance or slew rate could foul me up? Or something else I'm not thinking of... 1 Quote Link to comment Share on other sites More sharing options...
wuzzzer Posted March 3, 2023 Share Posted March 3, 2023 I haven’t but I know that many have done that with excellent results. 1 Quote Link to comment Share on other sites More sharing options...
the real Duke Spinner Posted March 3, 2023 Share Posted March 3, 2023 Done that with JBL 4430s Highly recommend 1 Quote Link to comment Share on other sites More sharing options...
Bubo Posted March 3, 2023 Share Posted March 3, 2023 10 hours ago, roninklipsch said: Wondering if it's possible to run main SS amp to low end and pre amp out of main amp to tube amplifier to run to high end? I would imagine I may need to tweak for gain perhaps but maybe impedance or slew rate could foul me up? Or something else I'm not thinking of... Male a diagram with specs for the amps, pre amp and speakers and post it here. Someone more knowledgeable than me can tell you if it's safe. Do the Fortes already have bi-amp capability or do the crossovers have to be modified or replaced ? My 2 cents Quote Link to comment Share on other sites More sharing options...
roninklipsch Posted March 3, 2023 Author Share Posted March 3, 2023 (edited) Maybe this helps? Thank you for the above comments.... Speakers..... Forte III SE (Yes, 4 speaker lugs, bi amp capable) Tube amp - Unison Triad 25 Output Stage: Push-pull, ultralinear, Class-AB Output Power: Approx. 45 watt per channel, Pentode Approx. 25 watt per channel, Triode Output Impedance: 6 Ohm Input Impedance: 47 kOhm / 50 pF Negative feedback: 5 dB or 1.8 dB Valve complement: 2 x ECC83 (12AX7) 1 x ECC82 (12AU7) 4 x EL34 (6CA7) Power Consumption: 300 watt max Fuses: T6.3A from 100V to 130V T3.15A from 220V to 250V Main amp- Michi X5 CONTINUOUS POWER OUTPUT 600W/Ch (4Ω) 350W/Ch (8Ω) TOTAL HARMONIC DISTORTION (THD) <0.009% FREQUENCY RESPONSE Line Level Inputs: 10Hz - 100kHz (+0 dB, -1 dB) Digital Inputs: 20Hz - 20kHz (0 ± 0.4 dB) Phono Input: 20Hz - 20kHz (+1.5 dB, -0.2 dB) S/N RATIO (IHF "A" Weighted) Line Level Inputs: 102dB Digital Inputs: 102dB Phono Input: 80dB INTERMODULATION DISTORTION (60Hz:7kHz, 4:1) <0.03% DAMPING FACTOR (20 Hz - 20kHz, 8 ohms) 350 CHANNEL SEPARATION >65dB INPUT SENSITIVITY Line Level Inputs (RCA): 380mV Line Level Inputs (XLR): 580mV Phono Input (MM): 5.7mV Phono Input (MC): 330 uV INPUT IMPEDANCE Line Level Inputs (RCA): 47kΩ Line Level Inputs (XLR): 100kΩ Digital Inputs: 75Ω Phono Input (MM): 47kΩ Phono Input (MC): 47kΩ INPUT OVERLOAD Line Level Inputs (RCA): 12.5V Line Level Inputs (XLR): 12.5V Phono Input (MM): 199mV Phono Input (MC): 22mV PREOUT LEVEL 2V OUTPUT IMPEDANCE 100Ω Edited March 3, 2023 by roninklipsch Quote Link to comment Share on other sites More sharing options...
Southern Posted March 3, 2023 Share Posted March 3, 2023 I have Forte 1's with a Dynaco ST-70 on the mids/highs and a Pioneer SX-1980 driving the woofers. Very impressive, chest thumping bass with the Pioneer and smooth upper end with the Dynaco. No tweeking needed, I even tied my SVS subwoofer in the mix. Quote Link to comment Share on other sites More sharing options...
CurtsForte Posted March 4, 2023 Share Posted March 4, 2023 3 hours ago, Southern said: I have Forte 1's with a Dynaco ST-70 on the mids/highs and a Pioneer SX-1980 driving the woofers. Very impressive, chest thumping bass with the Pioneer and smooth upper end with the Dynaco. No tweeking needed, I even tied my SVS subwoofer in the mix. Very nice Setup! I've got Forte 1s as well and am planning to try Bi-amping soon... Are you running the stock crossovers? I've thought about upgrading my stock ones to Crites (copper, silver or gold?) and having him do the bi-amp version for me. If can be done on stock ones, I'd maybe try it... Quote Link to comment Share on other sites More sharing options...
Southern Posted March 4, 2023 Share Posted March 4, 2023 15 hours ago, CurtsForte said: Very nice Setup! I've got Forte 1s as well and am planning to try Bi-amping soon... Are you running the stock crossovers? I've thought about upgrading my stock ones to Crites (copper, silver or gold?) and having him do the bi-amp version for me. If can be done on stock ones, I'd maybe try it... I replaced the caps and physically seperated the crossover into two seperate crossovers and reused the inductors and terminal cup. The problem with the early version of the Forte 1's is that they crammed the crossover on the back of the terminal cup which caused some slight warping due to heat when played at higher volumes. Quote Link to comment Share on other sites More sharing options...
Southern Posted March 4, 2023 Share Posted March 4, 2023 On 3/3/2023 at 8:16 AM, roninklipsch said: Maybe this helps? Thank you for the above comments.... Speakers..... Forte III SE (Yes, 4 speaker lugs, bi amp capable) Tube amp - Unison Triad 25 Output Stage: Push-pull, ultralinear, Class-AB Output Power: Approx. 45 watt per channel, Pentode Approx. 25 watt per channel, Triode Output Impedance: 6 Ohm Input Impedance: 47 kOhm / 50 pF Negative feedback: 5 dB or 1.8 dB Valve complement: 2 x ECC83 (12AX7) 1 x ECC82 (12AU7) 4 x EL34 (6CA7) Power Consumption: 300 watt max Fuses: T6.3A from 100V to 130V T3.15A from 220V to 250V Main amp- Michi X5 CONTINUOUS POWER OUTPUT 600W/Ch (4Ω) 350W/Ch (8Ω) TOTAL HARMONIC DISTORTION (THD) <0.009% FREQUENCY RESPONSE Line Level Inputs: 10Hz - 100kHz (+0 dB, -1 dB) Digital Inputs: 20Hz - 20kHz (0 ± 0.4 dB) Phono Input: 20Hz - 20kHz (+1.5 dB, -0.2 dB) S/N RATIO (IHF "A" Weighted) Line Level Inputs: 102dB Digital Inputs: 102dB Phono Input: 80dB INTERMODULATION DISTORTION (60Hz:7kHz, 4:1) <0.03% DAMPING FACTOR (20 Hz - 20kHz, 8 ohms) 350 CHANNEL SEPARATION >65dB INPUT SENSITIVITY Line Level Inputs (RCA): 380mV Line Level Inputs (XLR): 580mV Phono Input (MM): 5.7mV Phono Input (MC): 330 uV INPUT IMPEDANCE Line Level Inputs (RCA): 47kΩ Line Level Inputs (XLR): 100kΩ Digital Inputs: 75Ω Phono Input (MM): 47kΩ Phono Input (MC): 47kΩ INPUT OVERLOAD Line Level Inputs (RCA): 12.5V Line Level Inputs (XLR): 12.5V Phono Input (MM): 199mV Phono Input (MC): 22mV PREOUT LEVEL 2V OUTPUT IMPEDANCE 100Ω You have some very impressive equipment in your setup. All you need is additional speaker wire and a means to independently adjust the gain between the two amps. Your SS amp is more than capable of unleashing the full potential of the Forte's. Combined with a tube amp could be the icing on the cake. I would be interested in your impression/results of bi-amping. 1 Quote Link to comment Share on other sites More sharing options...
CWelsh Posted March 7, 2023 Share Posted March 7, 2023 I tried bi-amping my Forte IIIs with a D-class amp for the bass and and Amp Camp A-class for mid and high. Also tried it with a Marantz 1060 for mid/high. I may not have had things set up correctly, but I personally prefer using just the ACA. 2 Quote Link to comment Share on other sites More sharing options...
roninklipsch Posted March 10, 2023 Author Share Posted March 10, 2023 After some research I have decided a bi amp may work if I grab another power amp but I'm looking at tube Integrated. While I may be able to rig something up, I'm hoping a good integrated tube amp will do the trick. Thanks to all who chimed in.... Quote Link to comment Share on other sites More sharing options...
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