frequency

I had been using a profire 2626 for the past 12 years or so. I switched to the Behringer UMC1820 because it plays a little nicer with Linux.

The Behringer seems to have more low-mids in the output than the Profire 2626 did. It's a little off-putting to my ears. I was very accustomed to the old sound. I'm hesitant to call the Behringer muddy in comparison, but it might be.

Questions:

1. Is it common for different output devices to have different frequency profiles? It sort of makes sense, but I didn't expect that.

Hi guys,
I recorded vocals lately, and cannot get rid of aggressive high frequencies that weren't there before...
You can hear the main nasty frequency around 3-4Khz and some other ones from1 to 3 kHZ ( audio: Creep_VXREC_WA87ChorusAnnecy 1&2 )
I recorded the same vocals 1 month ago in another flat, and it was fine ( see audio "Creep_VXREC_WA87ChorusDundee").

Hi, I'm interested in buying some JBL speakers but the seller has said that the crossovers have been changed from the original JLB 4206 ones to JBL 4208 crossovers. He said that the speakers sound fine. But I have checked and the original crossover frequency of 2.8 kHz has actually been changed to a crossover frequency of 2.6 kHz (I got this the wrong way around in my title but can't edit it).

Does anyone know if this would be OK or would it have a negative affect on the sound of the speakers at all?

Anyone have any recommendations to tame highs in Mastering. I'm looking at a Drawmer 1973 right now because of my budget. Trying to stay out of the digital realm right now and do most if not all my processing in the analog realm. I'm also considering saving up for a Weiss Unit or a Maslec MBC. Any suggestions for outboard gear?

@Brien Holcombe dvdhawk audiokid pcrecord Boswell @Kurt Foster ( et al)

Okay, so, now that I seem to have a better balance of low end in my space ( not perfect by any means but certainly much improved) I had a few questions about upper frequency treatment...

1. The "mirror point" treatment:

Frequency - The speed of vibration of a sound wave, measured in cycles per second, or Hertz. Frequency determines pitch; the faster the frequency, the higher the pitch.

Cutoff frequency - The lowest frequency above which the normal incidence sound absorption coefficient is at least .990 for an anechoic wedge, or set of wedges,

Audio frequency - A frequency that falls within the range of the human hearing, usually taken as 20 Hz to 20 kHz.

Hi,
How to make a vocal's Hi-Mid to High frequency smooth and sweet during the process ?

I have my Emu 1820M optical output going into an Onkyo TX-SR500 reciever,
out to two Sony SS-B3000 3-Way bookshelf speakers.
https://docs.Sony.com/release//specs/SSB3000_mksp.pdf
1" tweeter, 3" midrange, 8" woofer
The crossover is not specified in specs.
Also, Sony support says they don't have the info.
There are options that need to be selected, such as Optical In 1, of course.
But also select number of speakers/configuration (2 speaker stereo)