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Old 14th November 2012, 09:59 PM   #1
lausar is offline lausar  United States
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Default 16 Ohm Speakers

Kinda new to chip gainclone amps. I'm looking for a backup amp to my SET 2A3 amp and I'm thinking about going chip amp route. Will I have any problems with these amps with my 16 ohm Altecs?
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Old 14th November 2012, 10:12 PM   #2
sreten is offline sreten  United Kingdom
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Hi,

No. In fact its good as I rate chips only good into 8R loads
as ideally really more suitable for 16 ohm reactive loads.

Go on the small side for the recommended 8 ohm PSU VA size.

Expect a little over half power of the chip amp rating into 8R.
(not that the chip amp can provide said power into 8 ohm reactive).

rgds, sreten.
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Last edited by sreten; 14th November 2012 at 10:20 PM.
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Old 14th November 2012, 10:46 PM   #3
BTW is offline BTW
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Hi Sreten,

Why do you recommend a smaller VA trans.. I'm thinking since the power rating will drop compared with a 8R load.. should a higher VA be a better way to go...

Thanks

Quote:
Originally Posted by sreten View Post
Hi,

Go on the small side for the recommended 8 ohm PSU VA size.

rgds, sreten.
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Old 14th November 2012, 11:13 PM   #4
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by BTW View Post
Hi Sreten,

Why do you recommend a smaller VA trans.. I'm thinking since the power rating will drop compared with a 8R load.. should a higher VA be a better way to go...

Thanks
Hi,

Higher VA is needed for lower impedance loads. For higher you need less VA.

rgds, sreten.
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Old 14th November 2012, 11:21 PM   #5
BTW is offline BTW
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Ok, thanks for the feedback very helpful... I'm building a GC soon..

Quote:
Originally Posted by sreten View Post
Hi,

Higher VA is needed for lower impedance loads. For higher you need less VA.

rgds, sreten.
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Old 15th November 2012, 12:25 AM   #6
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Quote:
Originally Posted by sreten View Post
Hi,

No. In fact its good as I rate chips only good into 8R loads
as ideally really more suitable for 16 ohm reactive loads.

Go on the small side for the recommended 8 ohm PSU VA size.

Expect a little over half power of the chip amp rating into 8R.
(not that the chip amp can provide said power into 8 ohm reactive).

rgds, sreten.
For the last several months I have been driving my huge vintage 15 Ohm Tannoy Yorks with a very inexpensive little T2020 amp and they work amazingly together. In fact I have relegated my old McIntosh SS amp into storage.
I purchased the T2020 originally to drive a pair of Realistic Minimus speakers and just out of curiosity hooked up my old Tannoys, not expecting much. Well, I was amazed.
The previous week I got a good offer on the Tannoys and almost sold them....but not quite yet!
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Old 15th November 2012, 06:49 AM   #7
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Quote:
Originally Posted by BTW View Post
Hi Sreten,

Why do you recommend a smaller VA trans.. I'm thinking since the power rating will drop compared with a 8R load.. should a higher VA be a better way to go...

Thanks
It is just an option to use a smaller VA transformator.
I would not do that.
It will not hurt

allso, what if you later would like to drive 8 ohm spekaers with the amp, but got a low VA traffo? yup, ain't gona work well.
So just go with the bigger traffo.
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Old 15th November 2012, 02:31 PM   #8
BTW is offline BTW
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Thanks for the advice.. Good point about having to drive an 8 ohm spk maybe ..later on..

Quote:
Originally Posted by Arty View Post
It is just an option to use a smaller VA transformator.
I would not do that.
It will not hurt

allso, what if you later would like to drive 8 ohm spekaers with the amp, but got a low VA traffo? yup, ain't gona work well.
So just go with the bigger traffo.
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Old 15th November 2012, 03:55 PM   #9
sreten is offline sreten  United Kingdom
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Hi,

If an adequate 8 ohms transformer is 100VA, some will say you
should go for 160VA or even 200VA. Not a lot of point here, as
the 100VA will perform like the 200VA with 16 ohm speakers.

I wan't suggesting undersizing, just don't oversize.

rgds, sreten.
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When your only tool is a hammer, every problem looks like a nail - Abraham Maslow
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Old 15th November 2012, 08:53 PM   #10
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dunno..
when it comes to traffo, a bigger one never hurt .
actualy i can't recall any drawbacks of having a larger then needed traffo..
(technical wise. not money spendt)
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