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March 25, 2023, 06:35:21 AM

Author Topic: Sonic difference between 4 ohm and 8 ohm taps  (Read 159 times)

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Offline ccmccull

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Sonic difference between 4 ohm and 8 ohm taps
« on: March 11, 2023, 03:10:51 PM »
I decided to give the 8 ohm OT taps a try today with my Spendor 3/5r2's. According to stereophile, these are 8 ohm nominal with a dip down to 6.2 ohms in the lower midrange.

https://www.stereophile.com/content/spendor-s35rsup2sup-loudspeaker-specifications

I didn't notice a huge difference relative to using the 4 ohm taps. Maybe slightly more articulate bass, but I'll need to do some real A/B tests to convince myself. What should I be listening for?

Colin
{Ortofon 2m Blue > U-Turn Orbit > Eros 2} & {Roon Ropieee RPi4 > hifiberry-digi2-pro > ANK DAC 2.1} > Moreplay > S.E.X. > {{Spendor_S3/5r2 & SVS_SB-1000 (x3)} & Grado_sr325x}

Offline Paul Birkeland

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Re: Sonic difference between 4 ohm and 8 ohm taps
« Reply #1 on: March 11, 2023, 03:23:24 PM »
That's a pretty minor dip and not necessarily broad enough or low enough to necessitate the change from 8 to 4.

Going from 4 to 8, you will get more power, less damping (looser sounding bass), and slightly higher distortion. 
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline ccmccull

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Re: Sonic difference between 4 ohm and 8 ohm taps
« Reply #2 on: March 12, 2023, 12:43:50 PM »
Thanks Paul. I'll live with it for a while on the 8 ohm taps and see what I think.

btw, I was thinking the 8 ohm tap might bring back the 60 hz hum on my grados that I discussed with you previously. But it did not. The 8 ohm / 2 ohm L-pad on the headphone jack seems to do the trick with the 8 ohm OT tap too.

Colin
{Ortofon 2m Blue > U-Turn Orbit > Eros 2} & {Roon Ropieee RPi4 > hifiberry-digi2-pro > ANK DAC 2.1} > Moreplay > S.E.X. > {{Spendor_S3/5r2 & SVS_SB-1000 (x3)} & Grado_sr325x}

Offline ccmccull

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Re: Sonic difference between 4 ohm and 8 ohm taps
« Reply #3 on: March 18, 2023, 02:39:05 PM »
Reporting back. 4 ohm definitely the way to go for my system. Yes I have to turn the volume pot up 20 degrees or so. But at 4 ohms the music is more present and dynamic. As I've written before in this forum, this amp eerily brings instruments and singers to life in the room. On the 8 ohm tap that talent diminishes slightly.

Example track: Paulo NutinI - Lose It. On the 8 ohm tap it sounds great. On the 4 ohm tap you can see the pick on the bass guitar string. Then the low A (55 Hz) is effortless. Then the drum enters the room. It builds and builds. Wow.

Colin
{Ortofon 2m Blue > U-Turn Orbit > Eros 2} & {Roon Ropieee RPi4 > hifiberry-digi2-pro > ANK DAC 2.1} > Moreplay > S.E.X. > {{Spendor_S3/5r2 & SVS_SB-1000 (x3)} & Grado_sr325x}

Offline Mucker

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Re: Sonic difference between 4 ohm and 8 ohm taps
« Reply #4 on: March 18, 2023, 09:13:40 PM »
FWIW, I use the Doc recommended 4 ohms. It drives my DT-1990 Pro, HD600, Aeon RT,  and HiFiMAN HE-6se V2 exquisitely. IMO, the S3X is the one of the best headphone amplifiers ever created. I honestly don't know how it could be better. So much thought put into it's design. Think hidden GEM or equivalent IMHO and really fun to build.
« Last Edit: March 18, 2023, 09:27:28 PM by Mucker »