Skip to main content

2017 Update: Hi-Fi Room

One year progress report


Garrard 301 + Ortofon RMG 309/SPU GME or
SME 3012 + Denon DL103

Digital line level sources processed 
through UTC A20 transformers

JEL Stereo Preamp DX

JEL Stereo SE2A3 DX amp with Tango NY15S OPTs

Altec 414As in 3.5 cf bass reflex enclosures + Altec 32A horns with 802D compression drivers


  1. I personally use 15 inch GAUSS WOOFERS, in a 6 cubic ft. box, with a pair of 1959 ALTEC bent horns, which were originally Army Barracks loud speakers mounted from hanger holes at the bottom if you sit them on the top of the woofer cabinets, with the driver sticking up in the air it sits outside the enclosure, and has it's own custom made crossover. They normally used to hang from the corners of military barracks buildings, the the driver hanging down. A year after I had the crossovers made, I decided to change the drivers to new Eminence 5 inch titanium drivers. After a while I began to miss the amazing mid range treble tones, so I decided to replace the old drivers as the new ones did not fit diameter wise under the aluminium cap, so instead of returning the new drivers, I had my man in Vancouver B.C. make me a pair of SUPER TWEETERS USING THE 5 INCH WIDE EMINENCE DRIVERS, which sit in a really cool looking wooden cradle which is also outside the enclosure, which sits nicely inside the dish of the mid range horn body. I have never seen another pair of heavy bent aluminium horn body before or since. The are the most original and strange looking 3 way speaker system you will ever see, and designed by me. So I have a pair of home speakers using 1990'S 15" GAUSS WOOFERS, 1959 ALTEC BENT ALUMINIUM HORNS, WITH SUPER TWEETER USING MID 20OO EMMINANCE TWEETER WITH 5 INCH MAGNETS. ALL POWERED BY A MID 70's PIONEER SPEC I AND SPEC 2 AMP PRE AMP, SET UP. I could haul them out of my storage and take a picture to send if you would like to see the most unique looking home speakers ever. In a good room on a dance hall stage it sounds like a mini concert hall P.A. They would power a dance hall alone and kick ass. They are my contribution to the weird and wacky things of this world. but sound so much better than commercial product. Would you be interested in seeing what such a set up looks like. Cabinets are plain Medite with no upholstery,
    I am Norm Harder.


Post a Comment

Popular posts from this blog

Altec 2-way horn system redux

Truth be told, I was never fully satisfied with the performance of the Altec 2-way which is why I never uploaded the old article in the Arkiv.
Let's recap how the 2-way horn system evolved...

The project was conceived in mid 1998 because I needed a monitor system that was more efficient than the OB/755 so I could listen to SE amps with 2 watts output and below.
I commissioned my cabinet maker neighbor to build 614 bass reflex cabinets and loaded them with Altec 419A 12" drivers + 811 horns (early version/heavy sand cast) and 804A compression drivers gathered from hamfests and radio shows. Crossover was a textbook 1st order/6dB/octave hinged at 900 hz and the horn padded down to match the sensitivity of the low frequency driver.

Eventually I acquired proper 12" woofers - Altec 414As, which lack the upper midrange nasties of the 419As. The 414As have great midrange quality even if they lack the bass end of their larger 416/515 brethren.

802D compression drivers replaced t…

Stereo > Mono Line Level Mixer

Mixing line level stereophonic signals into full dimensional monophonic ;)
Here's a DIY project for mono aficionados that's so basic, I should have uploaded it many years ago. But other things got in the way.

Just like an MC step-up, these are entirely passive devices. 

The simplest way to convert stereo to mono is to connect left and right channels via a Y connector. But there's a more elegant way than just shorting two channels.

Resistors can blend two signals into one better by...

...using Allen-Bradley carbon composition for warmer sound ;)
We can end the mixing quest here but...

...the most elegant way of mixing two channels as was done in the studios by audio pros of yesteryears was through transformers.

This single UTC A-20 transformer was in a box lot of tubes and parts I picked up at a radio show. It's a high quality transformer designed for mic, mixer or line matching applications. Instead of trying to find a mate for MC step-up duty, I repurposed it for a g…