ATC SCM45A - changing the amp to a Hypex FA253.

I love my ATCs, they are almost perfect for me.. I tried many other high end monitors, some had little things that I thought were better than ATC but as a whole, ATC won every A/B comparison so far.

But I’m still not perfectly happy with their sound in the low end.. and I’m not talking about sub bass but the low end they should have (-6db at 42Hz)

I have a two way small monitor (AdamT5V) with 5” bass/mid driver who puts what feels like more bass / upper bass(50-100Hz).
I know some of it is “fake” bass that relying on the port and it’s not as accurate as the ATC’s bass but it still enjoyable and I would like to have that character in my ATCs.

My question to those who know the sound of ATC monitors is: what is the reason for their lean bass sound? Is it the crossover design? is it the ports that are so big that I don’t get this pleasing resonance in the upper bass frequencies?
I’m sure it’s a voicing thing and that 2x7” woofers in each speaker can do more than that.

I never tried any speaker DIY but I’m willing to make my first attempt on the SCM45A if it will get me the sound I’m after, so I have two options:

Option 1 is to take this amazing mid dome and the tweeters and buy a new cabinets and use a different woofer for the bass, this is only if the bass drivers in the SCM45A are the reason for this lean sound I hear.

The easier option #2 is to buy a Hypex FA253 or other DSP amp so I could hopefully change the voicing of the speakers to my liking.

Also would like to know if I could order from Hypex a custom size amp that will fit the back of the cabinet instead of the original ATC amp?
 
>I love my ATCs, they are almost perfect for me.. I tried many other high end monitors, some had little things that I thought were better than ATC but as a whole, ATC won every A/B comparison so far.

yes I believe, had similar experience, because of class AB Mosfet output stage you have great clear sound, same speakers with BJTs output will sound poor

To be honest, add additional class D subwoofer


otherwise it will be going pricey