Received the MS-275 today.
Apparently it idles higher so I set the bias lower on this one, about 11 mVDC for each channel at a supply voltage of 13.6 V. It then idled at about 1.7 / 1.8 ampere.
DC offset on the speaker output terminals was about 27.8 and 31.4 mVDC or something like that.
I decided to set the bias of the MPS 2240 at comparable levels and ended up somewhere around 11.5 / 12 mVDC for each channel. It now idles at 1.3 ampere at a supply voltage of 13.8 VDC. I re-checked the DC offset, about 27.5 and 36 mVDC.
The main difference between the two is that the MS-275 is much, much more powerful at 4 ohms stereo. Actually, due to its restrictive 2 volt gains, it's obnoxiously powerful.
I'll probably be using the MPS-2240 on my high sensitivity Altecs and keep the 275 as spare, so I can swap it if at some point the 2240 is in need of repair.
I could not detect any huge differences in sonics (besides the power issue), but I only checked the 275 first and then the 2240. Usually, to be able to detect minor differences between very comparable amps, I need to listen the first amp again then the second amp again.
Apparently it idles higher so I set the bias lower on this one, about 11 mVDC for each channel at a supply voltage of 13.6 V. It then idled at about 1.7 / 1.8 ampere.
DC offset on the speaker output terminals was about 27.8 and 31.4 mVDC or something like that.
I decided to set the bias of the MPS 2240 at comparable levels and ended up somewhere around 11.5 / 12 mVDC for each channel. It now idles at 1.3 ampere at a supply voltage of 13.8 VDC. I re-checked the DC offset, about 27.5 and 36 mVDC.
The main difference between the two is that the MS-275 is much, much more powerful at 4 ohms stereo. Actually, due to its restrictive 2 volt gains, it's obnoxiously powerful.
I'll probably be using the MPS-2240 on my high sensitivity Altecs and keep the 275 as spare, so I can swap it if at some point the 2240 is in need of repair.
I could not detect any huge differences in sonics (besides the power issue), but I only checked the 275 first and then the 2240. Usually, to be able to detect minor differences between very comparable amps, I need to listen the first amp again then the second amp again.
Have you considered a center channel setup? The 2240 bridged would make a very good center channel amp to run along side the MS-275.
Also check the DC offset bridged by reading across the bridged outputs and see if the offset cancels out to near zero> It usually does.. glad you got the bias issue settled to your liking....🙂
Also check the DC offset bridged by reading across the bridged outputs and see if the offset cancels out to near zero> It usually does.. glad you got the bias issue settled to your liking....🙂
A center channel as used in a movie 5.1 setup ? I don't see the benefits of implementing that in my stereo music setup ?
Well, as you can read in your private message box, I might set the bias slightly different tomorrow for reasons mentioned 🙂
So I will agree to your last sentence tomorrow 🙂
Thanks !
Well, as you can read in your private message box, I might set the bias slightly different tomorrow for reasons mentioned 🙂
So I will agree to your last sentence tomorrow 🙂
Thanks !
- Status
- Not open for further replies.