list of 1U/2U & others .... neutral power amps

Lolo-G · Nov 8, 2025

Brand / Model	V. Unit	Class	Power	Fan	EQs	Weight (kg)
Palmer Macht 402	1	D	2x200W / 4 , 2X100W / 8 400W / 8 Bridged	Yes	High/Low/Rumble Filter( On/Off)	3.8
LD SYSTEM XS200	1	D	2x100W / 4 , 2x50W / 8 200W / 8 Bridged	No	No	3
LD SYSTEM XS400	1	D	2x200W / 4 , 2x100W / 8 400W / 8 Bridged	Yes	"	3.4
LD SYSTEM XS700	1	D	2x350W / 4 , 2x200W / 8 700W / 8 Bridge	"	"	"
Avantone CLA-100	1	AB	2x100W / 8 , 245W / 8 Bridged	Yes	No	6.7
~~Matrix GT800FX~~	1	AB	2x400W / 4 , 2x250W / 8 , 2x120W / 16 800W / 8 Bridged , 520W / 16 Bridged	Yes	No	3.7
~~Matrix GT1000FX~~	1	AB	2x500W / 4 , 2x300W / 8 , 2x150W / 16 1000W / 8 Bridged , 650W / 16 Bridged , 1000W / 8	"	"	3.7
Harley Benton GPA 400	1	D	2x200W /4 , 2X100W /8 2x50W /16 , 400W /8 Bridged 200W /16 Bridged	No	Resonance/Presence	3
Red Sound RPA 600x	1	D	300W /16 , 600W /8	Yes ?	No	3.9
Red Sound RPA 300x	1	D	2x300W /8 , 2X150X /16	"	"	3.6
Red Sound AMP S	*	D ?	2X300W /4, 2X150W /8	?	No	1.9

Synergy SIN 50/50	1	AB Valve	2x50W / 4 / 8 / 16 , 100W / 2 / 4 / 8 Bridged	Yes	Presence, Depth	10.9
Fryette LX II	1	AB Valve	2x50W / 4 / 8 / 16 , 100W / 2 / 4 / 8 Bridged	Yes ?	Presence(On/Off) /Depth(On/Off)	9.5
ART SLA-1	1	AB	2x100W /8 , 2x130W / 4 , 260W /8 Bridged	Yes	No	6
ART SLA-2	1	AB	2x200W /8 , 2x280W / 4 , 560W /8 Bridged	Yes	"	9
Carvin LT2000	1	D	2x340W /8, 2x580W /4, 1x1180W /8 Bridged	Yes	No	9
Dexon DHA 1700	2	H	2 × 600 W /8 , 2 × 1000 W /4 , 1 × 1700 W /8 Bridge	Yes	No	16

Orange Pedal Baby 100	*	AB	1x100W /8, 1x70W /16	No ?	Low/High	3.2
GSS 06BA400GPA	*	D	2x50W/8 (Not Stereo)	No	Low/Mid/High	0.55 + 0.3 ext. power supply
Harley Benton GPA-100	*	D	1X100W /8 , 1x190W /4	No	Low/Mid/High	0.8
Fryette PS 100	*	AB Valve	1x100W /4 /8 /16	Yes ?	Presence / Depth	7.3
Fryette PS-2A	*	AB Valve	1x50W /4 /8 /16	Yes ?	Presence / Depth	6.8
Carvin Mach 100	*	D ?	2x50W /8	No	No	0.3
KSR PA 50	*	AB Valve	1x50W /?	Yes ?	Top/Bottom	5.8
JET Stream	*	D	2x50W /4	No	No	?
Harley Benton Custom Line Thunder 99	*	D	2x50W /4	No	No	?
ISP Technology Stealth	*	H	2x75W /4 , 140W /8 bridged	No	No	0,5 + ? ext. power supply
Baroni Stage Ant	*	D	100W /4,8,16	Yes	Yes	0.5
Crown XLS 1502	2	D	2x525W /4 , 2x300W /8 , 1550 W /4 Bridged , 1050 W / 8 Bridged	Yes	Yes , digital filters	3,9
Crown XLI 1500	2	AB	2x450W /4 , 2x330W/8 , 900W /8 Bridged	Yes	No	12,7

The range of amplifiers offered by Crown / Carvin are very wide, only two models are listed here.
The Seymour Duncan Power Stage range consists of 4 models, but only the PS700 is listed

Budda · Nov 8, 2025

Your formatting didnt quite work @Lolo-G

Lolo-G · Nov 8, 2025

Budda said:
Your formatting didnt quite work @Lolo-G

I created a table

mtb · Nov 8, 2025

https://avantonepro.com/en/products/cla-100

Lolo-G · Nov 8, 2025

I have the LD System XS700 on order.

Domct203 · Nov 8, 2025

The ART SLA-1 and SLA-2 are both class AB. Great amps.

TheRedDevil · Nov 9, 2025

If you are motivated you could add the ~price.

The GPA 400 has no fan!

Lolo-G · Nov 9, 2025

Lolo-G said:
Brand / Model
Class
Power
Fan
EQ
Depth (mm)
Weight (kg)
Palmer Macht 402
D
2x200W / 4 , 2X100W / 8
400W / 8 Bridge
Yes
Low/high/ Rumble Filter (On/Off)
242
3.8
LD SYSTEM XS200
D
2x100W / 4 , 2x50W / 8
200W / 8 Bridge
Yes
No
244
3
LD SYSTEM XS400
D
2x200W / 4 , 2x100W / 8
400W / 8 Bridge
Yes
No
244
3.4
LD SYSTEM XS700
D
2x350W / 4 , 2x200W / 8
700W / 8 Bridge
Yes
No
244
3.4
Avanton CLA-100
AB
2x100W / 8 , 245W / 8 Bridge
Yes
No
260
6.7
~~Matrix GT800FX~~
AB
2x400W / 4 , 2x250W / 8 , 2x120W / 16
800W / 8 Bridge , 520W / 16 Bridge
No
No
482
3.7
~~Matrix GT1000FX~~
AB
2x500W / 4 , 2x325W / 8 , 2x150W / 16
1000W / 8 Bridge , 650W / 16 Bridge
No
No
482
3.7
Harley Benton GPA 400
D
2x200W / 4 , 2X100W / 8
2x50W / 16 , 400W / 8 Bridge
, 200W / 16 Bridge
Yes
Resonance/Presence
250
3
Red Sound RPA 600x
D
300W / 16 , 600W / 8
No ?
No
320
3.9
Red Sound RPA 300x
D
2x300W / 8 , 2X150X / 16
No ?
No
320
3.6

Synergy SIN 50/50
AB Valve
2x50W / 4 / 8 / 16 , 100W / 2 / 4 / 8 Bridge
Yes
No
340
10.9
Fryette LX II
AB Valve
2x50W / 4 / 8 / 16 , 100W / 2 / 4 / 8 Bridge
Yes ?
Presence / Depth ( On/Off )
318
9.5
ART SLA-1
AB
2x100W /8 , 2x130W / 4 , 260W /8 Bridge
Yes
No
340
6
ART SLA-2
AB
2x200W /8 , 2x280W / 4 , 560W /8 Bridge
Yes
No
340
9

TheRedDevil said:
If you are motivated you could add the ~price.

The GPA 400 has no fan!

Correction made, I do not wish to add the price because, depending on local taxes, it can differ significantly.

TheRedDevil · Nov 9, 2025

Lolo-G said:
Correction made, I do not wish to add the price because, depending on local taxes, it can differ significantly.

Thank you! Perhaps a rough price range, <$500, >$1000 or something similar.

MicroMort · Nov 9, 2025

can you list 2U as well? just have a column for 1U or 2U

Lolo-G · Nov 9, 2025

MicroMort said:
can you list 2U as well? just have a column for 1U or 2U

Give me the links and I'll add the amplifiers.

Bobbyoso · Nov 9, 2025

Mesa 20/20 is 1U, as well.

Lolo-G · Nov 10, 2025

Bobbyoso said:
Mesa 20/20 is 1U, as well.

is it neutral ?

Bobbyoso · Nov 10, 2025

Lolo-G said:
is it neutral ?

Don't know what you mean by "neutral". Do you mean 20-20k +/- 0.5 dB? I don't own one, so I don't know the specs. However, I have owned a Mesa 50/50 (the old one) since the late 80s, and a Simul 2:90 for a 12-year period in the late 90s, and they both sounded great, albeit with a tube pre (Mesa Studio Pre) driving them, and a pr of Mesa 1-12s with C90s.

I don't know how they translate to the frfr paradigm, but I have used my 50/50 and the Mesa 1-12s with my FM-3, and it sounded (and felt) phenomenal, BUT I don't believe it is as "neutral" as a great frfr (in my case, I use Yamaha DHR12M powered coax wedges, very similar to the EV PXMs).

The Mesa tube gear sounds great amplifying anything, including the FM-3, and does the AITR thing well, but the amp models are being seen thru the "lens" of very good, but not transcription quality, tube guitar amplification, with the added thump and slice tube amps often impart. And as noted, I have never owned the Mesa 20/20, don't know where it sits on the "accurate vs. idealized" amplification spectrum--, but perhaps others on the thread have more extensive experience. The two stereo Mesa poweramps I have owned were excellent, extremely heavy, bombproof, but I suspect that solid-state class AB or D will be lighter, cheaper--and even possibly more "neutral" than most tube gear, especially tube guitar gear. And the only Mesa tube amp that is 1U is the 20/20, I believe.

MicroMort · Nov 10, 2025

Lolo-G said:
Give me the links and I'll add the amplifiers.

Allowing for 2U opens up a lot of additional amps to compare.

I see you added a few already!

Orange Pedal Baby
Avatone CLA-200
Crown XLS 2502
Carvin DCM 1540L
ENGL 50/50 E840

Lolo-G · Nov 10, 2025

MicroMort said:
Allowing for 2U opens up a lot of additional amps to compare.

I see you added a few already!

Orange Pedal Baby
Avatone CLA-200
Crown XLS 2502
Carvin DCM 1540L
ENGL 50/50 E840

I think I'm going to open it up to rack-mountable amplifiers! The criteria are that the amplifier must be a flat-response type, whether for PA systems or not, or recognized by the Fractal community as being suitable for digital simulations. But it will be impossible to list everything...

JiveTurkey · Nov 10, 2025

A 20/20 is going to have el84s. Barf.

Lolo-G · Nov 10, 2025

Bobbyoso said:
Don't know what you mean by "neutral". Do you mean 20-20k +/- 0.5 dB? I don't own one, so I don't know the specs. However, I have owned a Mesa 50/50 (the old one) since the late 80s, and a Simul 2:90 for a 12-year period in the late 90s, and they both sounded great, albeit with a tube pre (Mesa Studio Pre) driving them, and a pr of Mesa 1-12s with C90s.

I don't know how they translate to the frfr paradigm, but I have used my 50/50 and the Mesa 1-12s with my FM-3, and it sounded (and felt) phenomenal, BUT I don't believe it is as "neutral" as a great frfr (in my case, I use Yamaha DHR12M powered coax wedges, very similar to the EV PXMs).

The Mesa tube gear sounds great amplifying anything, including the FM-3, and does the AITR thing well, but the amp models are being seen thru the "lens" of very good, but not transcription quality, tube guitar amplification, with the added thump and slice tube amps often impart. And as noted, I have never owned the Mesa 20/20, don't know where it sits on the "accurate vs. idealized" amplification spectrum--, but perhaps others on the thread have more extensive experience. The two stereo Mesa poweramps I have owned were excellent, extremely heavy, bombproof, but I suspect that solid-state class AB or D will be lighter, cheaper--and even possibly more "neutral" than most tube gear, especially tube guitar gear. And the only Mesa tube amp that is 1U is the 20/20, I believe.

Either it was designed for this purpose, or the community is using it as such.

MicroMort · Nov 10, 2025

Lolo-G said:
I think I'm going to open it up to rack-mountable amplifiers! The criteria are that the amplifier must be a flat-response type, whether for PA systems or not, or recognized by the Fractal community as being suitable for digital simulations. But it will be impossible to list everything...

Sure.. if you're doing the power stage then you should do the Pedal Baby

also, the Fryette PS-2/a and PS-100 are 2U and should probably be on the list.

you are right, there are a lot of options out there. great list though! thank you

Lolo-G · Nov 10, 2025

MicroMort said:
Sure.. if you're doing the power stage then you should do the Pedal Baby

also, the Fryette PS-2/a and PS-100 are 2U and should probably be on the list.

you are right, there are a lot of options out there. great list though! thank you

The PS700 is rack-mountable in 2U, the Pedal Baby 100 is not, but I added it because it's very popular.

Brand / Model	Class	Power	Fan	EQ	Depth (mm)	Weight (kg)
Palmer Macht 402	D	2x200W / 4 , 2X100W / 8 400W / 8 Bridge	Yes	Low/high/ Rumble Filter (On/Off)	242	3.8
LD SYSTEM XS200	D	2x100W / 4 , 2x50W / 8 200W / 8 Bridge	Yes	No	244	3
LD SYSTEM XS400	D	2x200W / 4 , 2x100W / 8 400W / 8 Bridge	Yes	No	244	3.4
LD SYSTEM XS700	D	2x350W / 4 , 2x200W / 8 700W / 8 Bridge	Yes	No	244	3.4
Avanton CLA-100	AB	2x100W / 8 , 245W / 8 Bridge	Yes	No	260	6.7
~~Matrix GT800FX~~	AB	2x400W / 4 , 2x250W / 8 , 2x120W / 16 800W / 8 Bridge , 520W / 16 Bridge	No	No	482	3.7
~~Matrix GT1000FX~~	AB	2x500W / 4 , 2x325W / 8 , 2x150W / 16 1000W / 8 Bridge , 650W / 16 Bridge	No	No	482	3.7
Harley Benton GPA 400	D	2x200W / 4 , 2X100W / 8 2x50W / 16 , 400W / 8 Bridge , 200W / 16 Bridge	Yes	Resonance/Presence	250	3
Red Sound RPA 600x	D	300W / 16 , 600W / 8	No ?	No	320	3.9
Red Sound RPA 300x	D	2x300W / 8 , 2X150X / 16	No ?	No	320	3.6

list of 1U/2U & others .... neutral power amps

Experienced

Axe-Master

Experienced

Inspired

Experienced

Power User

Power User

Experienced

Power User

Experienced

Experienced

Inspired

Experienced

Inspired

Experienced

Experienced

Fractal Fanatic

Experienced

Experienced

Experienced