I've been building a pedal board that houses pedals for both harp and guitar and tonight I finally tested it out and it worked great for both instruments. However I noticed a huge improvement with the DT when I used two pedals - a Lone Wolf Harp Delay (which I've always used with any amp I use for harp) but this time I also ran a Lone Wolf Tone + right after the Harp Delay. The DT became this huge sounding deep bassy, crunchy harp amp. Wow, the little DT suddenly had huge tone to die for. Before I only used the Tone + when using my guitar amps as harp amps but this pedal is just killer with a proper voiced harp amp.
Let me start by saying, I really dig the Double Trouble without pedals. I don't have a hard time getting good tone out of it. Different microphones yield different results.
Lately, I've been using a Harp Tone+ with my Double Trouble and Shure 520DX. It adds a lot of bass and you can cut the treble a bit. It's a pretty handy pedal to have. Here's an example.
I tried the Harp Tone+ pedal my Meteor Mini Meat and a friend's Sonny Junior 410. I didn't really add much to those amps.
Harpaholic - I agree that the DT was a tone monster stock with no pedals so I just didn't ever think about using the Tone + with it but it made a dramatically huge difference. I was quite shocked and very pleased. It started to sound close to my Super Sonny.
The only mic I use the Harp Tone+ pedal with are the cheap ones that aren't known for bass response like the Shure 520DX. I don't think it is necessary with a good CM or CR element.
THe HarpGear Double Trouble is indeed a great mid sized amp with a monster tone. Having heard the YouTube clips that Joe put up it does sound even more monstrous with the Lone Wolf Harp Tone+.
I'd happily play through one either with or without the pedal, just as I would any amp by HarpGear.