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The Zero Box Autoformers - By Paul Speltz



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The Zero Box Autoformers - By Paul Speltz

It is well understood the importance of getting a well matched amplifier for your speakers, or vice versa; getting the proper speakers for your amplifier. Now you can make virtually any amp/speaker combination work well together with the ZEROs.
 
 
Bill has been using these autoformers in many set-ups where optimum performance is the goal of himself and customers alike.
 
'Surprisingly, even very big powerful amplifiers built to be able to drive low impedance, low sensitivity speakers, perform better when driven into a speaker where the impedance has been raised 2 or 3 times...to 8 and sometimes 12 ohms.
 
In my experience tube amplifiers that have 4 ohm taps perform better when connected to their 8 ohm tap and then into the autoformer to multiply the 4 omh impedence of the connected speaker to 8 ohms'.

The ZEROs are the simplest type of transformer called an auto transformer or autoformer. They are used to multiply the impedance of any speaker so that it "feels" like the optimum load for the amplifier being used. They are very helpful in matching speakers to amplifiers. By adjusting the speaker's impedance, both the damping factor and the maximum power transfer of the amp/speaker can be tailored for best sound. Almost all amplifiers sound better when driving a higher impedance speaker, simply because amplifiers produce less distortion when driving less current.

Made of the same original toroidal autoformer; has the ability to multiply a speakers impedance by 2x, 3x, or 4x. For example, the ZERO can transform a 4 ohm speaker into an 8 ohm, 12 ohm, or 16 ohm speaker depending on which two of four leads/connections are connected to the amplifier. They are very helpful in matching speakers to amplifiers, even amplifiers that already have a variety of output taps available realise benefits.

The ZERO-Box is simply Paul Speltz' speaker impedance multiplying autoformer installed in a beautiful hand crafted lacquer finished in either a solid Cherry or Birdseye Maple wooden box with African Ebony wood accents on the four corners. The connections are available on Cardas binding posts allowing you to use your favourite speaker cables. The single pair of binding posts are the connections that go to the speaker. The quad set of binding posts allow you to choose the multiplication factor depending on which two of the four are connect back to the amplifier. Polarity passes through the box: Left in-Left out, Right in-Right out.
 
Zero Autoformers by Paul Speltz 

Impedance Multiplication Factors:

2x = Connect the inner pair of the Quad set to the amplifier 
3x = Connect the Left side inner, and Right side outer to amplifier
4x = Connect the outer pair of the quad set to the amplifier 
For example: a 4 ohm speaker can be made to look like a 8,12, or 16 ohm speaker.

The ZERO-Box is typically placed close to the speaker. A short set of high performance pure 12 gauge Copper jumper leads are use to connect the ZERO-Box to the speaker. These extremely neutral and transparent sounding leads are custom made to your needed length, and include spade end connections.The ZERO-Box is typically placed close to the speaker. A short set of high performance pure 12 gauge Copper jumper leads are use to connect the ZERO-Box to the speaker. These extremely neutral and transparent sounding leads are custom made to your needed length, and include spade end connections.
 
Typical Zero Box installation  
 

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