Hi,
I have a Marantz PM6006 and have purchased their service manual. Currently I am 4 ohm speakers-1 inch seas h1189+ 5 inch SB acoustics (around 87 db) for desktop speaker in a 150 ft room and also using headphones. I have some electronic and soldering skill.
1. Currently I have increased the bias from stock 45ma to 90ma across each emitter resistors in the power amp sections and the amp is stable.
2. I know the amp itself has a "house sound", but I found it was a bit too forward and thin in the mids and synthetic highs and with a one-note, much weaker and muddy bass (Voltage gain much higher than Current gain?). Is it possible, with some component change (preamp section?) to voice the amp to a "straight wire with gain" + "well (better) defined and controlled instruments and soundstage" kind of voicing? I think I prefer 10% less voltage gain with a higher current gain across the bandwidth.
3. Can I remove the DC blocking capacitors if I first measure no DC on the input leg of the capacitor to ground? I appreciate if someone can direct me to these caps as I want to be sure.
4. Are there any benefits if cap value of C6011, 6013, 6012, 6014 and C6019 (page 7); C5011, 5012 (page 9) (one channel) is increased? Any recommendations?
5. On the volume board (page 9), can I remove C5001 and 5009 as on question 3? Also can the diodes be upgraded? or simple circuit changes as I have read that the HDAM design is not the best?
6. I have read somewhere that the auto-standby circuit which activates on no sound from speakers can be disabled by removing two jumpers as this circuit is noisy, can someone direct me to the correct ones.
7. I am also using tone controls. Any suggestions as to the op-amps in the amp that should be upgraded? LM49720?
8. Any upgrades from the digital section as I am planning to purchase a Schiit Eitr to connect via usb to a computer. This connection is not asynchronous usb connections, is it?
9. Any bottlenecks or better design ideas in this amplifier (simply DIY tasks?)
Any other suggestions are most welcome.
Thank you.
I have a Marantz PM6006 and have purchased their service manual. Currently I am 4 ohm speakers-1 inch seas h1189+ 5 inch SB acoustics (around 87 db) for desktop speaker in a 150 ft room and also using headphones. I have some electronic and soldering skill.
1. Currently I have increased the bias from stock 45ma to 90ma across each emitter resistors in the power amp sections and the amp is stable.
2. I know the amp itself has a "house sound", but I found it was a bit too forward and thin in the mids and synthetic highs and with a one-note, much weaker and muddy bass (Voltage gain much higher than Current gain?). Is it possible, with some component change (preamp section?) to voice the amp to a "straight wire with gain" + "well (better) defined and controlled instruments and soundstage" kind of voicing? I think I prefer 10% less voltage gain with a higher current gain across the bandwidth.
3. Can I remove the DC blocking capacitors if I first measure no DC on the input leg of the capacitor to ground? I appreciate if someone can direct me to these caps as I want to be sure.
4. Are there any benefits if cap value of C6011, 6013, 6012, 6014 and C6019 (page 7); C5011, 5012 (page 9) (one channel) is increased? Any recommendations?
5. On the volume board (page 9), can I remove C5001 and 5009 as on question 3? Also can the diodes be upgraded? or simple circuit changes as I have read that the HDAM design is not the best?
6. I have read somewhere that the auto-standby circuit which activates on no sound from speakers can be disabled by removing two jumpers as this circuit is noisy, can someone direct me to the correct ones.
7. I am also using tone controls. Any suggestions as to the op-amps in the amp that should be upgraded? LM49720?
8. Any upgrades from the digital section as I am planning to purchase a Schiit Eitr to connect via usb to a computer. This connection is not asynchronous usb connections, is it?
9. Any bottlenecks or better design ideas in this amplifier (simply DIY tasks?)
Any other suggestions are most welcome.
Thank you.
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