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Warm sounding class d head?

I've always been a big fan of the GK stuff and would guess that the problem is in your EQ settings and not the amp itself. I checked out the EQ on that amp and would suggest trying a little work there first to see if you can get the amp where you want it be before moving on to another amp. First, try turning the contour off, as it boost lows and highs and cuts mids. That smiley face EQ is great for slap, but won't get you the warmth you are after. Next, try either running the treble flat or turned just slightly down while bumping up the bass and low mids just a touch. My guess is that the amp will sound much warmer with these very small EQ tweaks.

This. Exactly this.
 
I have both a GB Streamliner and Rumble 100. IMO the two can't even compare. It's really hard to get a bad sound out of the GB and the are just so many great settings. The rumble is more of a one trick pony that does variations on it's one trick. I got my Streamliner from the classifieds on the rec. of folks here and couldn't be happier with it.
 
I've used a GK MB500 with a fearful in situations where I wanted a pretty greasy tone.

I could get it, but it takes some fooling around. A nice starting point is try the treble at 9, upper mids at noon, low mids at 2 and bass around 11. Fool around with upper mids to dial in cut.

The GK MB500 isn't a harsh amp, just pretty open sounding. That together with a fearful can be too much in a mix without getting into eq. messing around.
 
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It largely depends on your cabinet as well, because I can plug my MB200 into my an Avatar neo 2x10 and it sounds "warm" with the right bass and EQ settings. I know it's hard to explain things in details sometimes, but if what you mean is less treble or something sounding muddy you might want to turn off tweeters, turn treble down, boost low mids, etc. before jumping into a whole other amp. Adjust playing techniques, try different strings, turn down the tone knob on the bass...there are many things within reason to try.

To rant a little, I always hear people saying one or the other about GK amps..."too clean, not gritty enough like a tube amp" or "Too harsh, not warm and smooth like a tube amp". Amazing how an amp can sound like neither of those at the same time LOL
 
Admittedly, I haven't read all 4 pages of this thread, but the first two didn't address other components that are impacting the tone.

What cab are you playing through? What kind of strings do you use? Strings make a huge difference in tone...
 
Aguilar TH500. Though I haven't used one myself, maybe a Fender Rumble.

I guess I'm in the minority here. Have owned and used an Aggie TH500. I would not describe it as warm. It's got a definite midrangey voicing going on. It does have more of a vintage tone to it than many of the modern heads however.

I owned an Ampeg SVT so I know the vibe you're going for but I've not found that in a class D head. I'm currently using a GK700RB which gets me as close as I've found. I didn't like the MB series of GK heads, not the same vibe as the RB line at all.

I hear good things about the Fender Rumble but have no experience with it.
 
I love gk, it's got it's place. I am getting rid of my tone hammer. It doesn't have a place for what I'm playing. The gk does. For what you want, the tone hammer will work perfectly.
 
I'm sure the Aggie TH will get love here, I need to check one out personally so cannot comment. I do however like the Ampeg Portaflex line (PF-800 to be exact). I am going to use my Portaflex rig tomorrow, leaving the hefty SVT rig alone for this one. : )
 
+1 on the fEARful 12/6 at church( around 1500 sq ft.) I use the TH 350 with this cab and it pumps out the thump anywhere in the room. With my Music man Stingray HS 4 I can get clacky/ mid focused grinding with the Ray that is cutting thru the mix.(2pm on the drive and 10 am on the gain) I have Rotosound Swing 66's on. We have keyboards, 6 string,12 string,shielded drums and usually a few singers, as well as me. Just been playing bass for a couple of years now and it is lots of fun for an old dude (60)