The slightly smaller unit looks exactly the same, except 3 heat fins per side instead of 5.
#26 (mine) had the same mosfet drivers too.
#26 (mine) had the same mosfet drivers too.
I understand Eric's desire to have multiple channels per chassis so he can park one by each speaker. I have this setup now and somehow it is just so cool to have one amp at each speaker connected by multiple one meter long speaker cables.
So, even though it will take more work, and manipulation, I think that in the end he will be more satisfied.
So the next question is whether the three channels per amp solves his needs. So, one for the tweeters, one for the mid, one for both bass drivers?
Talk about clipping! I think that the bass drivers are more likely to clip with just 60 watts.. Doesn't Linkwitz use 60 watts per driver?
I don't know much- I'm no master 😉 but I have read that the Aleph
isn't necessarily the best amp for bass use. An Aleph X might be better,but maybe that's a small point that you can work out later.
My inclination would be three channels per chassis as you propose but an Aleph for the tweeter, and Aleph X for the mids and some complementary Pass design for the bass to get the power up without cooking anything. I have no idea how these amps all sound together but there are people here that do know!
OR
Two channels per chassis- tweeter, and a bit larger for the mid,
and use two channels of your current amp per side for bass. Then you could use it on warmer days too..
OR
Put the two Pass channels in each box and a Hypex module for the bass
Should have bought that pair at the auction!
So, even though it will take more work, and manipulation, I think that in the end he will be more satisfied.
So the next question is whether the three channels per amp solves his needs. So, one for the tweeters, one for the mid, one for both bass drivers?
Talk about clipping! I think that the bass drivers are more likely to clip with just 60 watts.. Doesn't Linkwitz use 60 watts per driver?
I don't know much- I'm no master 😉 but I have read that the Aleph
isn't necessarily the best amp for bass use. An Aleph X might be better,but maybe that's a small point that you can work out later.
My inclination would be three channels per chassis as you propose but an Aleph for the tweeter, and Aleph X for the mids and some complementary Pass design for the bass to get the power up without cooking anything. I have no idea how these amps all sound together but there are people here that do know!
OR
Two channels per chassis- tweeter, and a bit larger for the mid,
and use two channels of your current amp per side for bass. Then you could use it on warmer days too..
OR
Put the two Pass channels in each box and a Hypex module for the bass
Should have bought that pair at the auction!My plan is similar to your second-last suggestion: use the A5 amps on midrange and tweeters, and continue to use my current amps (ie, my present voltage amps, not "current" amps) on the bass. Having (I think) finally heard and understood the importance of low harmonic distortion for good low bass reproduction, I want the cleanest amp down there. The current amp has 1%THD at 200w, and 0.1% at 180w. The system seldom uses anything near that, so HD should be even less in practice.
The issue is our ear's rapid change in sensitivity to level in the bass: 1% 2nd harmonic is perceived as something like 5% or more an octave above, say, a 30Hz fundamental. After three years with one set of amps, I switched last year to another, and this affect on the delineation of bass instruments and bass lines and separating them from stuff in the lower midrange was really obvious.
- Eric
The issue is our ear's rapid change in sensitivity to level in the bass: 1% 2nd harmonic is perceived as something like 5% or more an octave above, say, a 30Hz fundamental. After three years with one set of amps, I switched last year to another, and this affect on the delineation of bass instruments and bass lines and separating them from stuff in the lower midrange was really obvious.
- Eric
" ... My plan is similar to your second-last suggestion: use the A5 amps on midrange and tweeters, and continue to use my current amps on the bass. ..."
Mine will be a single stereo amp of ~ 1 horsepower driving large planar speakers and a single ~1/5 horsepower driving a single sub woofer ... them planars are real hungry.
(Here in the office we have a very old stereo, 60 watt Sony "current dump" MOSFET driving small planars and an el cheapo Chinese "all in one" sub.)
Mine will be a single stereo amp of ~ 1 horsepower driving large planar speakers and a single ~1/5 horsepower driving a single sub woofer ... them planars are real hungry.
(Here in the office we have a very old stereo, 60 watt Sony "current dump" MOSFET driving small planars and an el cheapo Chinese "all in one" sub.)
The Orion (Orion+ actually) has two woofers, one midrange, and two tweeters. The three channel amp will drive the midrange and two tweeters for one speaker. To quote myself, I described why I *want* separate amps for each tweeter earlier:
"Some are skeptical that each Orion tweeter needs it's own 60 watt channel, but I have small amounts of some kinds of music that, when played at rock concert levels, have clipped other 60 watt amps. SL uses them [the tweeters] down to 1.5hHz BTW. The power is not a need, but a desire!"
- Eric
"Some are skeptical that each Orion tweeter needs it's own 60 watt channel, but I have small amounts of some kinds of music that, when played at rock concert levels, have clipped other 60 watt amps. SL uses them [the tweeters] down to 1.5hHz BTW. The power is not a need, but a desire!"
- Eric
Variac said:
As a moderator you should be talking truth, truth and nothing but the truth? Didn't you hear it at my place?
As you know I run X 600 which is welding 1.2 KW on 4 ohms and Aleph 305 on top. In addition I ran 2A3 tubes for mids. I tried just my Aleph on tweets and mids and it sing just as good as tubes are doing. Tubes are a bit warmer as expected.
On the sound I will let Mark fill you in.
🙂 😀 😀 🙂
Ohhhh you caught me!!
Then again with the tube amp in there it isn't easy to say which Pass amps work well right next to each other. I wonder if my hearing is sophisticated enough to even make such a judgement. I have to confess they sounded excellent at your place in your system. I mean really Excellent!!That's why I really want Eric to make his amps. I suspect now that Nelson has some time to make suggestions our ideas will change!It seems that he has set up a little game for himself here, with us the winners!
Mark
OK, now you can download the rev 0 files for the 4 types of amplifier
output stages that I am looking at:
http://www.passdiy.com/np/burningamps/ba-os-pp-6-0.pdf
http://www.passdiy.com/np/burningamps/ba-os-pp-4-0.pdf
http://www.passdiy.com/np/burningamps/ba-os-se-6-0.pdf
http://www.passdiy.com/np/burningamps/ba-os-se-4-0.pdf
😎
output stages that I am looking at:
http://www.passdiy.com/np/burningamps/ba-os-pp-6-0.pdf
http://www.passdiy.com/np/burningamps/ba-os-pp-4-0.pdf
http://www.passdiy.com/np/burningamps/ba-os-se-6-0.pdf
http://www.passdiy.com/np/burningamps/ba-os-se-4-0.pdf
😎
Its not important now, but #26 came with a +18+18 transformer ... which has been forwarded to another DIY'er for inclusion in another project ... I now have a +45+45 (~400 VA) for #26, which almost suits my purpose = since I don't anticipate driving it this one with "continuous music power" it probably will work just fine ...
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