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Old 24th December 2012, 01:26 PM   #261
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Quote:
Originally Posted by Pallas View Post
What about an inexpensive 6-channel amp (there are lots of "whole room audio" amps of sufficient power for this task out there used, as well as new) for the tops, and a bigger separate 2-channel amp for the woofers?

I'd be tempted to use one of the newer Class D "pro" amps for the woofers, such as the Crest ProLite 2.0 or Crown XLS1500.
As I said, I'm not big into amps, particularly all the inexpensive stuff that is out there today. I can only comment on what I have. My basic recommendation is for 100/8, with 4 ohm capability. Such amps should be able to drive the woofers in parallel even if using the XXLS or XLS woofers and push the system (and you ears) to its limits.
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Old 24th February 2013, 07:23 PM   #262
SAC is offline SAC  United Kingdom
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Hi John, I see 100W into 4ohms is necessary for the subs/4th channel. However, for those with a different sub set-up (low power requirement), what would the top 3 channels get by on? I want to drive the top 3 from the Miniamp, which is 10W into 4ohm - medium sized room, moderate listening levels. Thanks.
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Old 25th February 2013, 11:00 AM   #263
Toaster is offline Toaster  United Kingdom
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You get an additional 3dB of output by doubling power, so you should be about 11dB down using a 10W amp rather than 100w, all else being equal. In practice manufacturer's/ designer's amplifier power ratings are not always accurate and how much distortion you are getting at an amp's rated maximum may vary from manufacturer to manufacturer. the sensitivity of the Note main panel is about 89-90dB, so it will go as loud as any other speaker of that sensitivity with your amps. The bottom line is to give it a go and see if is loud enough for you. If it isn't there are lots of inexpensive higher-powered amps available if you DIY. Some of the cheaper class D amps are very good value.
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Old 25th February 2013, 11:35 AM   #264
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Originally Posted by Toaster View Post
You get an additional 3dB of output by doubling power, so you should be about 11dB down using a 10W amp rather than 100w, all else being equal. In practice manufacturer's/ designer's amplifier power ratings are not always accurate and how much distortion you are getting at an amp's rated maximum may vary from manufacturer to manufacturer. the sensitivity of the Note main panel is about 89-90dB, so it will go as loud as any other speaker of that sensitivity with your amps. The bottom line is to give it a go and see if is loud enough for you. If it isn't there are lots of inexpensive higher-powered amps available if you DIY. Some of the cheaper class D amps are very good value.
Thanks Toaster for the reply to SAC. I agree with most of what you are saying, but make that 10 dB down. One thing to realize is that if you install the rear tweeter you are looking at about 2 ohm load to the tweeter amp. There isn't much power to the tweeters so the low impedance should not bother most amps. I'm currently experimenting with the Class D Audio amps. I placing a miniDSP 2x4 and two CDA254 Class D Audio amp boards in the base of each speaker. The Class D amps roll off quite a bit on top due to the interaction of the inductive output filter with the tweeter load, but I think that can be corrected with some EQ. So becareful with class D amps as the output filtering may roll the top end off significantly. The Note II has been well received by the diy community.

It has also lead me to some updates tot he NaO II RS which I guess will be the NaO II RSa. While the NaO II in RSa form will continue on, it will be available in digital format only.
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Old 25th February 2013, 03:30 PM   #265
SAC is offline SAC  United Kingdom
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Thanks for your input Toaster. I am considering buying the Miniamps but only if someone has experience of using them successfully with the NaO Note II. They are certainly attractive in being easy to power/connect to the minidsp.

If anyone has experience of the Miniamp running 90db speakers, or better yet the NaO Notes, please let us know.
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Old 8th March 2013, 05:06 AM   #266
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Originally Posted by SAC View Post
If anyone has experience of the Miniamp running 90db speakers, or better yet the NaO Notes, please let us know.
Note enough power (pun intended).

You might just get away with 10w going into the speaker if you don't listen very loud.... however you can bet the miniamps (no time to go to the spec sheet now sorry) will be rated for 10w at too-high distortion.

There's plenty of cheap class D at around 25-50w which would be a much safer bet. Although these won't stack with a 2x4 minidsp board, which I can understand might be an attractive proposition.



Me?! I just received my plans, and am hoping to knock together a quick and dirty version once I return from my honeymoon next week (yay!).

Even if they're only a brief point on my journey, John deserves to get paid. I've spent more (and learned less) on a book before.... compared to what John has up on his website.
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Old 8th March 2013, 09:49 AM   #267
gazza49 is offline gazza49  United Kingdom
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In Johns earlier post he states (100/8, with 4 ohm capability),is that 100 watts for 8ohm with 4 ohm capability or 8x 100 watts at 4 ohm. ?
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Old 8th March 2013, 12:16 PM   #268
SAC is offline SAC  United Kingdom
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MiniDSP datasheet;
2 x 20W @ 8ohms, Continuous power BTL
4 x 10W @ 4ohms, Continuous power SE
THD + N (half power) 0.05% (BTL) / 0.08% (SE)

So, SE or single ended, is 0.08%, but "half power". That means at half of 10W I think, so distortion is good at 5W!?

Gazzas' question is relevant here it seems.

Enjoy the honeymoon Dave.
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Old 10th March 2013, 01:24 AM   #269
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SAC (Thanks) ... That's right. 0.08% @ 5w (or 10w BTL) .... Not enough unfortunately.


Gazza. Doesn't really matter.... John means.. 8 x 100w @ 8ohm .... with the ability to drive 4 ohms (which would normally mean more power @ 4ohm)

That is enough power to take this speaker to it's limit. IMHO if you had an amp which was more like 100w@4ohm (and less power, say 75w@8ohm)... This would also be fine, assuming you weren't trying to send yourself deaf ;-) ;-)

Also keep in mind that dual tweeters need a 2ohm capable amp if you run them parallel.
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Old 10th March 2013, 01:42 AM   #270
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Originally Posted by gazza49 View Post
In Johns earlier post he states (100/8, with 4 ohm capability),is that 100 watts for 8ohm with 4 ohm capability or 8x 100 watts at 4 ohm. ?
To drive the SLS woofers in parallel an amp rated at 100w into 8 ohms and capable of driving a 4 ohm load. Typically the amp would have a higher power rating into 4 ohms. I use a pair of Adcom 7605, 5 channel amps which are rated at 125/8, 175/4 and they are much more powerful than really required. 50 W/8, 90 to 100 into 4 would probably do fine for most but I like the amps to have plenty of head room.
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