I'm not looking at all. I commented on Ken's recommendation of searching for a used Iso. transformer instead of purchasing new/used from known vendors.

That's great, that the topic has been discussed numerous times -it's a very important consideration (AC power quality) in extracting the best possible performance from hi-fi gear.

pj

1000 Watt isolation transformer should be enough not hold back audio system?

We still don't have details about your installation,
Cable box?
Near by wifi router?
What do you want to acheive?

all suggestions are great especially with balanced power.
But a simple isolation and do things in order to remove like a wifi router does affect preamps and DACs S/N.

ive got Bookshelf Speakers a SET Tube Amplifier 6 wpc and Class D Amplifier 90 wpc and 2 Subwoofers and Hybrid Preamp its strictly 2 channel setup

Is all your equipments are in the same power bar ou electric distribution?
ie: to have all that is audio on the same ground potential.

i have 2 passive power conditioners Gut Wire Maxcon and Essential Sound Products i bought blue circle power conditioner i now plug my passive power conditioners in the blue circle power conditioner theres improvement if a isolation transformer will give me improvement even more why not get it

-- 12 Dec 2017 04:06 --

and yes all my stuff plugged into 1 wall outlet

The size (in KVA rating) of the isolation transformer you use is directly related to the gear you intend to power from it.

You can quite easily power a CD player, a transport, a DAC or a preamp with a small tranny, say 125VA. You might even be able to do two digital devices from the same 125VA unit. A tranny can isolate your digital gear from the rest of your system, and protect your gear from powerline spikes.

A power rating rule of thumb is to use a transformer rated for three times the power you intend to draw from it. If you are wanting to try a tranny on a power amplifier, that rule jumps to FIVE times rated draw or more. My own system ultra-isolator is rated at 15KVA.

If you can find a used ultra-isolator at the right price, these transformers are one of the cheapest ways to clean up your system's sound. The difference is heard in purity of tone, imaging, musical coherence -- in overall terms, clarity and musical information. When I bought my first over a decade ago, for about $35 IIRC, I was tremendously pleased with the bang for the buck.

Clearly, used iso trannies used to be a much better bargain. Now, because folks who use them have shared their experience on the Internet, demand has increased and prices have risen. Thanks much to Ken Hotte of Teo Audio for generously sharing advice on how to find a good one at lower cost today, as well as other related info very interesting to some of us.

CAM warmly encourages folks in the audio industry to participate on the Forums as passionate hobbyists -- read about this policy in the CAM Rules.

Would this work?

There are multiple sources of electrical noise in an audio system. An isolation transformer reduces incoming AC noise, however the majority of the noise on your incoming AC line to each audio component is generated in your home.
Power amp diode bridges, lightning dimmers, furnaces, fridge motors, microwave ovens, washer, dryer, and the greatest evils can be the switchmode power supplies in your plasma/LED tv, DVD player, computers, gaming system, cell phone chargers, etc. Ideally your power distribution bar/box filters each audio component’s AC input because each audio component both generates and receives noise. Controlling both AC noise generation and susceptibility is the goal.
Isolation transformers can have electrostatic shields, the better ones have 2 shields and the best have 3 shields ( primary, secondary and core), but typically nobody in the audio power industry goes that far.
The CMR (common mode noise rejection) increases with the number of shields.

Running all your system on the same AC phase helps - a typical house is 240 VAC which is 2 x 120 VAC circuits 180 degrees out of phase with each other and spread around the house to hopefully equalize the load on each phase. Your system works best ( lowest noise ) when all interconnected components are on the same AC phase.

A quality wide band cable TV transformer (think Jensen) can also help with breaking ground loop noise (and picture quality) when an AV processor or audio feed from a TV is part of your system.

It doesn’t always work. I added a Hammond 1000 watt isolation transformer with built in AC outlet to a preamp, but found the transformer hummed once installed, I had 3 of them, they all did the same, so most of the time they work, but sometimes they don’t, impossible to predict, depends on your Equipment, AC power line and grounding. Sometimes any product with a toroidal transformer inside will buzz, sometimes it’s a transformer with loose windings requiring replacement, sometimes the AC power line has a DC component (from possibly a nearby industrial power user) and a DC blocking filter ( a capacitor/diode bridge is required to clear up the noise - Bryston saw this problem in export markets enough to install this type of filter inside their power amps with torroid transformers)

For the best results the internal power transformer of all audio equipment with linear power supplies can be individually CRC damped on the secondaries to greatly reduce the rectifying noise passed into the internal DC power supply and reduce the noise generated back onto the AC line. This has the most audible benefit when all the system chain is internally filtered ie: pre amp, power amp, tuner (remember those?) etc. An ossiliscope and a $25 impulse tester are used to tune the CRC components, but it means accessing the internal chassis of each product, not many are willing or able.

An isolation transformer doesn’t stop the audio equipment power supplies on the secondary side of the isolation transformer from interacting to each other every AC cycle. The advice on sizing of an isolation transformer by Toby is a good guide line.

Assisting an isolation transformer can be a simple CLC filter consisting of a fused input , then a 10 uf X2 rated safety cap, an oversized common mode choke, and another 10 uf X2 rated cap with a 1 meg 1 watt flame proof resistor in parallel which can be constructed in an external box with an AC outlet makes a very good local isolation filter for an individual audio components. The caps must be X2 rated for AC line use only. If you don’t know what your doing buy a commercial AC filter/distribution power center. Monster’ model 5100 is a good example of individually filtered outlets - ideally just one component on each filtered outlet would be best.

Excellent suggestion/recommendation. (Additionally, separating digital gear from analog also helps ensure a 'clean' AC signal path).

pj

So you're plugging power conditioners into power conditioners then on top of that into a isolation transformer?

Hmmm..

Gary

It's not always necessary to buy the newest to get some gain, so why not look at used? New is right there, and I'm not interested in being a market shill, nor do I think that other manufacturers would shun such reasonable talk from another manufacturer. If one wants to buy new, then by all means, look into it.

My mentioned trade off was the trade off of learning and effort being required, no rubber stamp behavior, thank you very much. I mentioned pretty well all the possible avenues, not just one. Even the class d build trick, if one really wants to play around, but that's a game for a really well rounded tech person, not the casual reader. Some of these class D amps can put out a good 2500 watts and that's not something to be trifled with. Pretty well as dangerous as the given light socket.

As for phase matching of the halves of transformers, well, this is done by every manufacturer that I'm aware of. the precision of such is a question but then comes the value or sound qualities of the given levels of precision. What does that mean for the sonics of the given scenario?

Until that is qualified and weighted into the equation, the entire value of matching and how close the average transformer is compared to a premium audio brand may be....well...it's up for grabs. the best that can be done is to make a perfect transformer and then on the same set up, make one that where the phases are off by the expected industry average... and then compare the two in sound quality. Of course, with all things being equal, which they never are, ie, the given test sytem being different and different levels of sensitivity to these aspects and so on.

Then one would know and be the only one who knows..and find a wall of other people's inability to understand one's particular point of understanding.

_________________
(Ken Hotte, of) Teo Audio

And the mysteries ... continue.

peter (of Jasz)

i can hear humming on 1 of my right channel subwoofer when i put my ear up close to the sub and hissing or hash noise when i have my ear close to speakers will a isolation transformer help with maybe even eliminate the problem

Not sure. But ear-muffs may ! (lol)

pj