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Will this amp trick work for increasing bass performance?

I'm considering matching Focal Utopia Scala Evo with two amps for bi-amping, to separate bass and mid/high. 

I'm considering the Pass Labs XP-32 pre-amp, which has individual volume controls for each channel/amp. By slightly increasing bass amp volume over mid/high amp volume, I get to feel more punch from the 11" woofers. The crossover in the Focals cuts off at 220Hz, so only bass and sub bass are affected.

Which two power amps would you consider? Power amp budget is about $30K. Was told Focals like power, so >250W for bass amp seems the minimum. Pre amp will likely be Pass Labs XP-32.
Maybe Pass Labs X250.8 + X150.8 or X250.8 + XA60.8?

Your thoughts please? Any other ideas to get more bass performance from the 11" woofers in the Focals? Subwoofer is not an option. I know McIntosh has a pre-amp with equalizer, which would solve the problem too. But I always thought EQs are a no-no.
robert1976
robert1976 OP
75 posts
 
@pwerahera Thanks for chiming in. It's not a dedicated listening room; it's my living room. It's 30ft wide and 28ft deep, with openings to the left and back. The X and * mark speakers and listening position:

                        30ft
             -----------------
             |      *       *       |
---------           x           | 28ft
|                                    |
---------           ----------
             |          |            
             |          |  
             --------

robert1976 OP
75 posts
 
@georgehifi Thanks for the suggestion! If it's very transparent, it can't hurt to try it out. Currently I use XLR from pre to power amp.
Using this tone controller means I have to go RCA all the way right?

Would changing from XLR to RCA make any difference?
georgehifi's avatar
georgehifi
10,312 posts
 
robert1976 OP
Using this tone controller means I have to go RCA all the way right?
Yes you will have to do that.

Would changing from XLR to RCA make any difference?
Only benefit for xlr if the interconnects are very long >10mts xlr then helps for noise if any.
And in some cases rca sounds better, as the xlr input and outputs on many bits of equipment are fake! Using balanced opamps with what is single ended circuitry throughout, so the rca input or output in these cases bypasses those balanced opamps and goes straight to the single ended circuitry input or output.

Cheers George


onhwy61's avatar
onhwy61
5,218 posts
 
You do not need to bi-amp, but you will need a powerful, high current amp.  To best implement an equalizer you will need a preamp with a tape loop.  Most tape loops are single ended RCAs, but there are some preamps with balanced tape loops.  The other alternative is to insert the equalizer between the preamp and the power amp.  The most tone control like high quality equalizer is the Dangerous Music Bax.

Does anyone know if Tidal has built-in EQ functionality?
barts's avatar
barts
713 posts
 
I have to agree with millercarbon on this one, that is that a DBA would be the way to go.

That's a really large room for two 11" woofers!

I see that the rear of the speakers has speakers terminals labeled "Bass Input". Does that mean you can bypass the internal cross-over?  IF so, then you can, go here:
https://www.marchandelec.com/xm44-electronic-crossover.html  and purchase an external crossover (2 way any slopes you like and control the gain as well)  requires a second amp of course.  

The cross-over will run you about $1500-$1700, depending on options, like fully balanced, tubes etc.

Then borrow an amp and give it a try, seems to be a cheap experiment given the $$$$ you are willing to spend.
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