Hi!
Since the German distributor did not aswer my emailed question, I post it here:
I have a LCAudio End Millenium (not the XP version), currently configured as a mono amplifier, with an R-Core 320 (2 * 33 V , 340 VA, and 2 * 36 V 40 VA), with 2 * 20000 uF (BC-Components) on the 33 V rails and 2 * 4 * 2000 uF Panasonic FC on the 36 V rails, directly attached to the drivers.
Since I also have a second (unused) End Millenium module, and want to drive a 4 ohm load with enough reserves, I would like to parallel both modules (adding a second powersupply, configured as above).
Is that possible? If so, how? Just by adding emitter resistors on the output? Using an OPA134 (which I have lying around)?
Or would you advice me against my idea?
Bye,
Arndt
Since the German distributor did not aswer my emailed question, I post it here:
I have a LCAudio End Millenium (not the XP version), currently configured as a mono amplifier, with an R-Core 320 (2 * 33 V , 340 VA, and 2 * 36 V 40 VA), with 2 * 20000 uF (BC-Components) on the 33 V rails and 2 * 4 * 2000 uF Panasonic FC on the 36 V rails, directly attached to the drivers.
Since I also have a second (unused) End Millenium module, and want to drive a 4 ohm load with enough reserves, I would like to parallel both modules (adding a second powersupply, configured as above).
Is that possible? If so, how? Just by adding emitter resistors on the output? Using an OPA134 (which I have lying around)?
Or would you advice me against my idea?
Bye,
Arndt
Hi Arndt,
I don't know your particular amp, but in general it is close to impossible to put two (or more) amplifiers in parallel.
Your problem is (amongst others) that the overall gain from input- to output-terminal have to be exactly the same. Also, the slew-rates need to be identyical. Otherwise, they will just see each other as additional loads (along with the speaker which should be your load).
YOu'll have my respect if you succeed, but my guess is that you'll ruin at least one of the modules, considering that tolerances will make it almost impossible to have two complete amps that behave in exactly the same way. The amp's are not designed to do this, and if you lack power at a given sound level, my advise is for you to look at a different amp.
Jens
I don't know your particular amp, but in general it is close to impossible to put two (or more) amplifiers in parallel.
Your problem is (amongst others) that the overall gain from input- to output-terminal have to be exactly the same. Also, the slew-rates need to be identyical. Otherwise, they will just see each other as additional loads (along with the speaker which should be your load).
YOu'll have my respect if you succeed, but my guess is that you'll ruin at least one of the modules, considering that tolerances will make it almost impossible to have two complete amps that behave in exactly the same way. The amp's are not designed to do this, and if you lack power at a given sound level, my advise is for you to look at a different amp.
Jens
I thought that version on Millennium also had the provision for adding an extra output board. Why not use the designed feature?
Hi!
Because that would mean that I had to buy that extra board (about 40 € EDIT: Make that 60€...), and my second End Millenium module would still be lying around unused...
I got two modules slightly used, with 2 toroids (which I use for other projects) and those caps for the price of one...
Bye,
Arndt
UrSv said:
Because that would mean that I had to buy that extra board (about 40 € EDIT: Make that 60€...), and my second End Millenium module would still be lying around unused...
I got two modules slightly used, with 2 toroids (which I use for other projects) and those caps for the price of one...
Bye,
Arndt
1. Why don´t you email Lars Clausen himself? ( lc@lcaudio.dk ) They also have a Q&A section on their homepage. Try it.
2. Your amp is famous for its stability and power ( 240 W ) in 4 Ohm loads. Why would you want to tickle with it?
3. If I had another board and the power supply to go Í would build a twin to the one you have.
What´s your application; sub or centrechannel?
2. Your amp is famous for its stability and power ( 240 W ) in 4 Ohm loads. Why would you want to tickle with it?
3. If I had another board and the power supply to go Í would build a twin to the one you have.
What´s your application; sub or centrechannel?
Hi!
I use it as a subwoofer amplifier. XO / EQ is being done via DSP.
And I want to tickle with it because the sub I am building right now (Zebulon Ultra, from Germany's magazine "Hobby Hifi", 4 ohms, 15") can easily handle 300 W RMS, and even more as long as it is not constantly being pushed to its limits.
So I though that adding a little bit of "extra" power would be nice 🙂
I would build exactly the same amp again, but I have no use for it... And most people I know are not interested in a single monoblock, and don't use active subwoofer amplifiers, or if they do / will, they would buy a subwoofer module which can be build into the sub (actually the concept behind the "Zebulon Ultra" mentioned above...)
As for building the module with the additional power devices for myself - I think I would rather buy it, since I suppose (or hope) that LCAudio uses selected Sanken devices for them... Which would be expensive for me to do...
Anyway, thanks...
Arndt
Btw.: What about balanced operation? Thinking about the OPA134 or my DSP again... 😕
AndersP said:
I use it as a subwoofer amplifier. XO / EQ is being done via DSP.
And I want to tickle with it because the sub I am building right now (Zebulon Ultra, from Germany's magazine "Hobby Hifi", 4 ohms, 15") can easily handle 300 W RMS, and even more as long as it is not constantly being pushed to its limits.
So I though that adding a little bit of "extra" power would be nice 🙂
I would build exactly the same amp again, but I have no use for it... And most people I know are not interested in a single monoblock, and don't use active subwoofer amplifiers, or if they do / will, they would buy a subwoofer module which can be build into the sub (actually the concept behind the "Zebulon Ultra" mentioned above...)
As for building the module with the additional power devices for myself - I think I would rather buy it, since I suppose (or hope) that LCAudio uses selected Sanken devices for them... Which would be expensive for me to do...
Anyway, thanks...
Arndt
Btw.: What about balanced operation? Thinking about the OPA134 or my DSP again... 😕
Oh, forgot: And as for Q&A on LCAudio.dk... 😎 😎 I don't understand Danish... and there is no translation available...
Maybe Babelfish can help...
Bye,
Arndt
Maybe Babelfish can help...
Bye,
Arndt
Well, If you do not manage to get it going the way you want I could easily be talked in to a trade of some sort.
I asked the same question on the pass forum, how X1000
are able to run parallel. The reason I asked is because
the new JBL car amplifiers can run parallel mode and bridged
mode. How is it done electrically? As it turns out, nobody
was able to answer my question on that old thread. /hehe
mysteries of the sith...
are able to run parallel. The reason I asked is because
the new JBL car amplifiers can run parallel mode and bridged
mode. How is it done electrically? As it turns out, nobody
was able to answer my question on that old thread. /hehe
mysteries of the sith...
Also most of the Crown amps (maybe JBL is using one of their circuits) can be run in parallel mono. Maybe someone doing repair of PA stuff has access to their schematic diagrams.
As already mentioned: one possible solution is to drive both channel's output transistors by the same drivers.
Regards
Charles
As already mentioned: one possible solution is to drive both channel's output transistors by the same drivers.
Regards
Charles
phase_accurate said:
I also thought about that. Meaning: Disabling all the not necessary stuff on my second EndMillenium board...
But then I would end up with the same thing like that additional board, at the cost of having destroyed some traces on the PCB...
But then I could de-solder the transistors from my 2nd board, and build the additional board with them... if dissatified, I could always resolder them into the original PCB, and use it for something else...
Mhmmm...
Cradle22, before you do to much (I'm boring here): Paralleling two amps will in theory increase the sound level 3 dB. Is it worth it? Why don't you put an oscilloscope at the output (and run it in "rolling" mode, if you have a digital oscilloscope) and check peak voltage. How often does the amp clip. How loud will it be at clipping?
My amp here at home gives me 2 x 180 W/8ohms, 300W/ 4ohms. When my VU-meter tells me that I play at 100 W peak power my neighbours aren't very pleased with me.
My amp here at home gives me 2 x 180 W/8ohms, 300W/ 4ohms. When my VU-meter tells me that I play at 100 W peak power my neighbours aren't very pleased with me.
Hi!
Well, sadly I don't have a Scope... - "What, you don't have a scope? That is something we should have to remedy, isn't it, lad?" 😉
I think that you are right. But normally I feel calmer if I know that theoretically I can drive all my stuff to its limits 😎 😎 It's the same like people adding more and more filter caps to their amp's supply (eg. P3A, Rod says that more than 10.000 uF per rail would be a waste of money, but there are more than enough people out there who won't settle for anything less than 50000 uF per rail...)
Oh, and regarding my neighbours: There are people in my house who aren't very pleased with the sound levels I achieve right now... I have to admit that they are my landlords... and also 🙂cannotbe: ) my parents... The people who rented the flat directly beneath me never complain about my music, but my parents do (probably because they are anxious that some tenants will complain someday)...
Bye,
Arndt
peranders said:
Well, sadly I don't have a Scope... - "What, you don't have a scope? That is something we should have to remedy, isn't it, lad?" 😉
I think that you are right. But normally I feel calmer if I know that theoretically I can drive all my stuff to its limits 😎 😎 It's the same like people adding more and more filter caps to their amp's supply (eg. P3A, Rod says that more than 10.000 uF per rail would be a waste of money, but there are more than enough people out there who won't settle for anything less than 50000 uF per rail...)
Oh, and regarding my neighbours: There are people in my house who aren't very pleased with the sound levels I achieve right now... I have to admit that they are my landlords... and also 🙂cannotbe: ) my parents... The people who rented the flat directly beneath me never complain about my music, but my parents do (probably because they are anxious that some tenants will complain someday)...
Bye,
Arndt
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