Koch LB120-Loadbox II
Koch LB120-Loadbox II

LB120-Loadbox II, Guitar Power Attenuator from Koch.

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All user reviews for the Koch LB120-Loadbox II

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Average Score:4.8( 4.8/5 based on 6 reviews )
 5 reviews83 %
 1 user review17 %
Not satisfied with those reviews?
mortimer Valla12/18/2012

mortimer Valla's review (This content has been automatically translated from French)" Save your neighborly relations"

Koch LB120-Loadbox II
I use it since 2008. I bought a VOX AC H1TV. I got totally fooled by the power of the amp. Can not do without like cruncher as to vibrate the walls. So I had to find a solution.
I have not tried other models.
there is a version 16 ohms and one 8 ohms. On the device include:
direct output section: amp simulation (with two types of micro orientation and 2 types of firm) / pure DI (0-10db) / headset with volume (which I do not utlise ...)
a section for output on a second HP (note the sum of the resistances) and
6 attenuation levels available: 100% - 40% - 15% - 5% - 2% - 1%. I usually use between 15 and 5% (note I'm pretty well insulated home). 1% it seems to me that the sound of the amp is still a bit distorted.
What I like most: ease of use, the possibility of having a second output with speaker simulation (I made a decision on the HP amp with a SM57 and a socket with the simulation) j ' records often both.
what I like least: having to unplug the amp to change the level of reduction.
value for money seems to me excellent because it is clearly a machine built to last. plastoc not cheap by any metal is very heavy.
Mark Twang11/15/2009

Mark Twang's review (This content has been automatically translated from French)

Koch LB120-Loadbox II
Koch offers us a box of tricks which innovates in the world of direct box: it is an all in one particularly attractive characteristics. It's simple: the paper is simply indispensable tool for users of tube amp.

- Dummy load: dummy load allows you to use an amp head without plugging in an HP. Recall that in normal times, such manipulation led to toast the output transformer of the amp. Attention to the order must choose between the Model 4 ohms, 8 ohms or 16 ohms.
- Attenuator Power: 6 slices ranging from 100% (no attenuation) to 1% (maximum attenuation).
- Transmission line: two sections of direct outputs, one filtered (Recording) and the other not. The filtered output is the most comprehensive: a balanced output XLR and unbalanced in jack. The filter simulates the uptake by micro two voicings, one emulating the axis of the microphone, the other type of cab (1 or 4hp). No selection on the type of cab (open / closed) nor the ambience of the room. The other section (Direct Out) that is equipped with unbalanced outputs type jack, one attenuated (-10db) the other not.
- Headphones output allows you to play with his amp head at night without disturbing anyone.
- Multiplication of cab: what connect two cabs to the output of the attenuator ... provided that the sum of the output impedance is equal to the input impedance (4, 8 or 16 ohms depending on your model LB120II)

Supplied accessory: a cord 2m long HP, 2 x 1.5mm ², with Switchcraft plugs straight.

In short, it is near perfection ... but I take two points because of the fixed impedance of loadbox.


1. One connects the output of the amp head WITH A CABLE HP unshielded input Z = x ohms at the bottom right.
2. The cab is connected to the output of a wafer and a single - always with a speaker cable - the power atténuatueur.


connecting a small cord IN CABLE HP output of a portion of the attenuator to the input of the section Multiple cabinet (entry named "From Attenuator") and then connects the two cabs on the "To Two Speakers - Total Load = Z ohms.


we do not branch cab (thank you to the dummy load) and you connect a headset

and / or

no one branch is no cab and connects to the console by one of the direct output, filtered or not. After, you have to make your sauce to treat the resulting sound.

On the "Multiple Cabinet": it is equipped with parallel outputs, making it a bit useless for me. My amp can get out of 8 or 16 ohms, but as Loadbox impedance is fixed impedance (16 ohms in my case), if I want to connect two speakers, I can not use the V112HTV (16ohms): I need two 32-ohm cabs - which is pretty rare - so that their total load is 16 ohms. This is less problematic on models 8 ohms (thus operating with two cabs into 16 ohms) and 4 ohms (two 8-ohm cabs).

Again, it is near the perfection but I take two points because of this problem fixed impedance.

- Power Attenuator Section:
I find it really well, fairly transparent up to 5% mitigation. I still feel it loses a bit of articulation, but as I use the supplied speaker cable, not necessarily at the top, I expect to receive a second Evidence The Siren II to be categorical. A 1% and 2%, it seemed that the sound became more saturated buzzing. Anyway, special mention for the opportunity to change mitigation on the fly, without having to turn off the amp head, without audible plop ... it's really useful on an amp without master volume to match the volume of the clear and the sound saturated.

- Recording Section "direct output filtered.
The speaker simulation is good but very neutral with respect to the sound of the Alnico Blue is not really convincing. In my opinion, it can not substitute for direct drive by micro ... but can probably add on an additional track. If we really wanted to use in recording, as there is no integrated treatment room, think about adding a bit of reverb on the console so that it sounds good.
Both options are voicing rather subtle but real: it was more acute with the micro axial position, the more serious the position 4x12 cab. "Reproach: We can not disengage the internal speaker simulation, it is therefore not possible to use the balanced output without passing through the filter, which is a shame if we intend to use another speaker simulation, the more powerful behind. Fortunately, there is the Direct Out section.

- Section Direct Out "direct out unfiltered."
An unbalanced output unattenuated, another at-10db. I will try later to record with, if I can get hold of a simulation of HP software. Complains: no balanced XLR output for this section.

- Headphone output:
The result is really not very pretty. Better to plug into a table and plug in the headphones on the table. An output therefore not very efficient but still useful if you have nothing else handy.

I remove a point for the headphone output and disappointing for the lack of balanced output unfiltered.

1st review hot on the Koch LB120II 16 ohms connected between a Vox AC 15 head and cabinet HTVH 112 HTV Vox Celestion Blue Alnico mounted.

Tentative conclusion:
- A versatile tool really useful thanks to the Dummy Load ally based direct box.
- A very good attenuator. I can finally play with the saturation of my Vox natural home. For me, it will be from 15% mitigation on the day and 5% in the evening. The 40% looks to me ideal for a quality mic to capture a volume humanly bearable home studio.
- An HP calculator correct but not respect your sound if you're used to the character of your HP (Blue Alnico, Greenback ...).
- Features crippled because of the fixed impedance and speaker emulation not removable.

In short, a versatile tool that has the huge advantage of being without a competitor in the market (pending release of a possible rival in NOS) and that will make great service, but misses his vocation as a tool ultimate cause of universal design to fixed impedance, the lack of balanced output unfiltered and weakness of the headphone output.

SUGGESTION FOR THE GENTLEMEN OF AT KOCH: please, install an insert jack Neutrik locking input on Z, so as not to risk being unplugged accidentally when the head is turned!

TycoTyco's review (This content has been automatically translated from French)

Koch LB120-Loadbox II
Look "retro" and "tough" and when you take a look inside: it's serious ...

S manual in <strong>French</strong> on this link: http://www.fillingdistribution.com/

And now everything is clear ...

The initial sound is <strong>really conserved</strong>

Really necessary when you have a tube amp ...

Finally it was the sound without the drawbacks (eardrum crippled, hatred of the neighbors, etc ...)

The POD and other simulators are great for work, but let's face it, they do not replace in <strong>any way the sound of tubes ...</strong>


A very good product <strong>

Ironie's review (This content has been automatically translated from French)

Koch LB120-Loadbox II
Attenuator / dummy box analog rack by adding a power (the fan is already in, but not food, fortunately we do not need rack when not!).
Headphone out, line and XLR input jack.
A speaker simulation or 1x12 4x12 to choose. Choosing the position of the microphone (either right or diagonally).
Too bad that the impedance is fixed, fortunately my two amps are 16 ohms!

Manual in English, I almost make a connection error the day I received it, thankfully a friend has turned me, I do not know what were the consequences, but otherwise it is very simple as it know where the exit is and where is the entrance).

I do not use that loadbox, connected to a mixer. The sound is simply stunning, never heard my two amps sound as well as with this device! (I've never been able to push as thoroughly as we should say;) ). Mini flat for the headphone output is not as good as the output on a table, better plug your headphones into the headphone output of the table if one has a! But it still helps out at 3 am 'in the apartment' when no mixing desk!

I use a Peavey Classic 30 and an Orange Tiny Terror. For concerts I take only the small Orange in its carrying case and shoulder strap I put in my bag loadbox the guitar is very easy to transport, to the sound that can be drawn is a great setup!
Sure, on paper from a Pod or other simulation / preamp with 20 amp models and it does not effect the weight, especially considering the price, but when has an amp lamp is inimitable sound, I much prefer playing with loadbox with a cabinet because I can edit sounds better.
I plug all these people in my mixer and my PC, we get a quick sound of professional recording! And all this with headphones or low volume!
I bought used on this site for € 250 on the advice of a member of a rival forum, since I have noticed a renewed interest in this material, there is evidence 3 months (date when I bought it) there were 3 ads for selling this equipment, there are now two ads of people looking to buy a new one! I think it had to the fact that this material was too little known but it appears in voice rehabilitation.
I would look to acquire one second because I can not connect my two amps simultaneously on my loadbox only, through an AB / Box to play on both at the same time this should be a treat! But the ads are becoming rare as previously stated, we must be patient.
A set of all the hands of enthusiasts gear!

PS: For use in attenuator, do not forget to use a speaker cable between the amp and loadbox and between loadbox and baffle.

Berzin's review (This content has been automatically translated from French)

Koch LB120-Loadbox II
Everything has been said.
A rather unfortunate thing is the mitigation system. A rotary switch would be easier to use a series of outputs (100%, 40%, 15 %...)
Too bad we can not also change the input impedance.

Otherwise, no complaints, solid construction, it is quite comprehensive and it does not heat.

No problem. It's easy to see how it works. It is still advised to read the manual (comprehensive) to make no nonsense and slam the amp head. He does not know French, but everyone can not be grown and then the books, it often speaks Portuguese.

The machine is very transparent. He does not eat the treble and the dynamics, like so many attenuators. on the other hand, although it does not heat, I have some doubt about its ability to collect 120 w. I took the test (120 head thoroughly, thoroughly mitigation, he did not, he was producing strange sounds. But this is not the goal. Most of the time, simply reduce to 40, 15% have an excellent sound. Otherwise, to change the amp.

Without reaching the quality of a microphone before the hp, the output is excellent emulated. I use it often transplanted to the stage. More feedback problem and I am confident that the audience does not perceive the slight loss of quality compared to a microphone.

I use it for a year and a half. It's expensive, but it's very solid and it has a line out, emulated output and this is Loudbox. No need to practice then. Since I have, I wonder how I managed to do without it. This is an accessory that is needed quickly. If we could change the impedance as the Marshall (but who eats the sound), it would be the total growing stock.

reybtom's review (This content has been automatically translated from French)

Koch LB120-Loadbox II
See the opinion below
This is the most comprehensive Dummy Box / Attenuators

Archi simple, and you plug it work

The sound of my amp (Mesa DC-5 Head) is very well respected for the part and the output attenuator simulator HP is very good, plenty good enough to record demos

I've had a few weeks
By far the best attenuators and also much more than that. The sound is very transparent, the number of outputs allows many connection and the simulator output with HP's settings and angle of the microphone body 1 or 4 HP bluff is made
I bought it new less than 350 euros on the web and at that price the quality / price ratio is perfect
Remains to be seen wearing the lamps in use. One can also regret that it is not multi-impedance, but if you are on to keep his amp head for a while, it's not a concern