stereo turntables in DD use.

[whirlcool]

Yes, DAK sold BSR eq units.

I've used EQ units before with my systems. I have a TOL ADC unit that is quite good. I used it with my last Phase Linear system. But since I have switched over to SAE equipment, I no longer needed it. In fact my SAE P101 preamp has no tone controls whatsoever on it. It has a volume control and that's it. So if I wanted control over music tone, I needed to use the SAE E101 Parametric EQ unit.

A parametric equalizer is much better than a graphic eq because it gives you better control over individual frequencies. It lets you change the music to exactly how you want to hear it. However, I have frequently found that if I turn off the EQ unit and just let the music play I am actually quite close to the original flat response of the system itself.

Back to DAK. I have heard that Drew Kaplan started DAK industries while he was still in college, out of his dorm room and made a bunch of money. I always used to love reading his descriptions of the items sold. He personally wrote them.
One thing he did hit on before it became very popular was the Bread Machine. He was selling those at least two years before it became the "have to have" item for the rest of the world.
I've visited the new DAK website before. From what I understand, he's doing ok again.

Man, he sold 100,000 of those Thunderwoofers.....

 

[lordkenmore]

The tone control system that always interested me was a system that NAD used on their higher end equipment in the late 1980s. They called it "semi parametric". There was the usual "Bass" and "Treble" knob. But each knob also had a switch that could select one of three frequency ranges for that knob. This supposedly gave more control, and more chance of having a meaningful fix for a problem, while still staying fairly simple. The tone controls could be bypassed, too. They even gave suggestions of a few fixes. This system has struck me as possibly being an exception to my "tone control systems make things worse or do nothing!" stance.

http://nadelectronics.com/products/hifi-amplifiers/1300-Stereo-Preamplifier

 

[swestoyz]

Sansui had a similar tone control switch for the bass and treble controls on their TOL receivers and pre-amps through the 70's. Both swtiches allow the user to choose a frequency level for bass or treble (mid level is always active), or defeat the individual tone control as needed.

As I've grown more accustomed to the sound of the 990db, I have found that I almost always defeat the bass control. The natural sound from both the recording and the amp section do not need to be fooled with at the preamp stage.

Ben