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Two Scott 299s to one pair

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Posted on January 4, 2017 at 10:13:01
jack3
Audiophile

Posts: 7
Joined: January 4, 2017
Would like to drive each speaker with full power of each amp set to mono and not bi-amp. Best way without adding components? DAC has two sets of outs that are active concurrently.
Input appreciated.
jack

 

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RE: Two Scott 299s to one pair, posted on January 4, 2017 at 13:05:57
Jeffrey Lee
Audiophile

Posts: 583
Location: Louisville
Joined: September 24, 2002
Contributor
  Since:
July 14, 2011
What exactly do you mean by "set to mono"?

 

RE: Two Scott 299s to one pair, posted on January 4, 2017 at 13:38:57
DaveV
Audiophile

Posts: 292
Location: SC
Joined: December 26, 2009
Your wording is kind of confusing especially when you mention "bi-amp."

I think your talking about switching both 299's to mono input so that both channels receive the same input, then switching one 299 to play channel A and the other 299 to play channel B.

If that's the case your only using one channel of each 299 or about 17 watts for each speaker. No better than just using one 299 for a pair of speakers in terms of available output power.

To utilize the output of both channels in one 299 of around 34 watts, you'd have to bridge the speaker outputs of both channels and I'm not sure if that's so straight forward in a 299 or not.
Best to wait for a reply from someone that can answer that.

If you really do mean "bi-amp" each speaker but without adding another component like a bi-amp xover, I guess you could do that with one 299 per channel or speaker but you'd have to split the speaker xovers in the right place to avoid burning out the midrange,tweeter or both since that setup will send low frequencies to both and you still need the speaker xovers. Now you'd have 2 sets of inputs per speaker.

You'd have control over the shelving of lows and highs in each speaker with the balance control, control over the bass to the woofer. control over the treble to the mid/highs with each 299 and you'd have the full output of each 299 per speaker but the other potential advantages of bi-amping won't be there.

Unconventional yet interesting idea if you have two of the same integrateds unless I'm overlooking something.

 

RE: Two Scott 299s to one pair, posted on January 4, 2017 at 15:14:06
6bq5
Audiophile

Posts: 2137
Location: SF Bay
Joined: August 16, 2001
Contributor
  Since:
September 14, 2012
You should be able to "strap" the two channels together- Common to Common, and, say 8 ohm taps to each other - channel a to channel b- on one chassis- and then you will be getting the combined output into one set of speakers-

Connect the speakers to the Common and the 'strapped' tap (* ohm in example)

Remember that the actual impedance is now halved- so the 8 ohm tabs are really 4 ohms, so if you have 8 ohm speakers - strap the 16 ohm taps...
Good luck
Happy Listening

 

RE: Two Scott 299s to one pair, posted on January 4, 2017 at 15:18:30
jack3
Audiophile

Posts: 7
Joined: January 4, 2017
I was hoping to set the "stereo selector" to mono thinking I would receive full power. And if the input signal was only from one channel then I could accomplish full power output to each speaker.
Want to get full range signal to each speaker and not have to bi-amp.

 

RE: Two Scott 299s to one pair, posted on January 4, 2017 at 15:36:45
Eli Duttman
Audiophile

Posts: 9355
Location: Monroe Township, NJ
Joined: March 31, 2000
Bridging is the way to go, but the 2 sections have to be fed out of phase signals. The OP said no additional components and the necessary out of phase signals have to be generated. Generating the out of phase signals requires parts. TANSTAAFL!

Eli D.

 

RE: Two Scott 299s to one pair, posted on January 4, 2017 at 15:43:50
Eli Duttman
Audiophile

Posts: 9355
Location: Monroe Township, NJ
Joined: March 31, 2000
You are fighting TANSTAAFL and LOOSING.

How good are your soldering and associated skills? The objective can't be reached without some tweaking inside the units and the addition of some supporting stuff.

For starters, tell us which 299 (A B C D) is being dealt with. The correct OEM schematic is very important.

Eli D.

 

RE: Two Scott 299s to one pair, posted on January 4, 2017 at 16:08:57
jack3
Audiophile

Posts: 7
Joined: January 4, 2017
Well, adding a second amp isn't quite a FL. But if that's the case, I think I will abandon the idea.
Thought maybe I could feed two channel A signals into the amp and come out with both sides of power going to one speaker and accomplish with cables/connectors.
Guess two systems are not a bad thing after all.
jack

 

RE: Two Scott 299s to one pair, posted on January 4, 2017 at 16:24:14
jack3
Audiophile

Posts: 7
Joined: January 4, 2017

 

RE: Two Scott 299s to one pair, posted on January 4, 2017 at 16:41:18
jack3
Audiophile

Posts: 7
Joined: January 4, 2017
6bq5
How does this configuration get a "left" signal into both sides?
And bridging both sides together? I must be missing something.
jack

 

RE: Two Scott 299s to one pair, posted on January 5, 2017 at 00:27:15
Michael Samra
Dealer

Posts: 35458
Location: saginaw michigan
Joined: January 30, 2005
Contributor
  Since:
June 24, 2005
Download this Scott operator's manual and read page 4.

"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

 

RE: Two Scott 299s to one pair, posted on January 5, 2017 at 06:18:50
jack3
Audiophile

Posts: 7
Joined: January 4, 2017
Second paragraph, just use center channel? I guess it implies to just input the L channel as stated in first paragraph.
While it doesnt state, I guess there is an implication also that you will be using power from both sides.
If that is the case, then it would be accoumplished in this configuration? I was concerned about not inputting both sides.
Will give it a try when I get them ready.
Thanks all, again.

 

RE: Two Scott 299s to one pair, posted on January 5, 2017 at 07:06:27
PakProtector
Audiophile

Posts: 11232
Joined: May 14, 2002
If you're going to bridge instead of parallel connect, you will need a phase splitter to feed each existing channel signals that are 180-degrees out of phase. A small transformer like the UTC A-18 does a fair job of this, and can run step up or step down.

They will tolerate signal level well below 20 cps at levels quite adequate for the application. Then you hook your 8R speaker between left and right 4R output taps, and ignore the ground.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.

 

RE: Two Scott 299s to one pair, posted on January 5, 2017 at 15:22:57
Awe-d-o-file
Manufacturer

Posts: 16733
Location: 100 miles west of DC
Joined: January 10, 2004
Contributor
  Since:
October 31, 2005
Dont abandon the idea if you have biwireable speakers. If you dont then yes internal surgery is required. Its not a simple modern SS amp.


ET

"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936

 

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