Hello, I think I am going to buy an LH1000 head. The cab I have is an Ampeg PN (Pro-Neo) 410, 8ohms and 850 watts. My question is: All the 1/4 outputs on the amp say 4 ohms but the manual says you can use an 8 ohm cab. It also mentions using the speakon cable output on the amp in the bridged mode. Can I leave the amp in un-bridged mode and still run the speakon cable, or do I need to use a 1/4 cable from amp to speaker (out of one of the 4 ohm labeled outputs). Lastly, can I use one of the hybrid cables where the 1/4 is used on the amp output and then goes into a speakon end on the cab? My assumption is that in un-bridged mode I will be sending 500 watts to my PN cab? I don't want to run the bridged amp into my cab due to the power. Thanks and I hope that made sense.
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Hartke LH1000 ohm and cab question
- Thread starter VoxRox
- Start date
The 1/4" outputs should say 'min 4 Ohms', not '4 Ohms'.
It should be fine running a cable from the 1/4" output to the Speakon input of the 8 Ohm cab. This will utilize only one of the two power amps and yield around 300 watts.
Using the Speakon in bridge mode will give you both power amps, yielding twice the power.
You can run a minimum load of 4 Ohms, either with a single cabinet or two 8 Ohms cabinets. When you have a combination of cabinets that will end up lower than 4 Ohms, you can split them and run the two power amps separately, each with a min of 4 Ohms.
It's quite complicated at a glance, but easy once you wrap your head around it.
It should be fine running a cable from the 1/4" output to the Speakon input of the 8 Ohm cab. This will utilize only one of the two power amps and yield around 300 watts.
Using the Speakon in bridge mode will give you both power amps, yielding twice the power.
You can run a minimum load of 4 Ohms, either with a single cabinet or two 8 Ohms cabinets. When you have a combination of cabinets that will end up lower than 4 Ohms, you can split them and run the two power amps separately, each with a min of 4 Ohms.
It's quite complicated at a glance, but easy once you wrap your head around it.
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el murdoque, are you saying that the amp is 1000 in bridged mode, and in un-bridged mode it would send 500 watts to a 4 ohm but would send less thna that to my 8 ohm cab? If that is what you are saying, then if I run it bridged and use the speakon cable, approximately how much will it be sending to my 8 ohm cab? Or can I not do that?
I owned a LH1000 in the past. IIRC, each ("side") amp can go down to 2 ohm.
Each side at 8 ohms only puts out 225 watts each.
Bridged into 8 ohms is around 700 watts I believe.
Edit: from their website....
Each side at 8 ohms only puts out 225 watts each.
Bridged into 8 ohms is around 700 watts I believe.
Edit: from their website....
- Dual Parallel mode offers 2 x 225 watts at 8 ohms, 2 x 320 watts at 4 ohms, 2 x 545 watts at 2 ohms
- Bridge mode offers 750 watts at 8 ohms, 1,100 watts at 4 ohms
- Classic 12AX7 Class A tube preamp circuit
- Bass and Treble shelving, Mid-peak EQ controls
- Selectable Brite and Limiter switch with LED indicator
- Balance control blends level of A and B outputs
- Front panel balanced XLR direct output
- Rear panel 1/4" Effects loop
- 1/4" and Twist & Lock output connectors
- 2-rackspace metal chassis with steel faceplate and handles
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So to me that says bridged mode with speakon cable into my 8 ohm PN410 no problem
a powerful and simple head, but man, it's a boat anchor compared to more modern amps!
either way yeah, bridge it mono and use the right speakon cable to get 1000w into 4Ω and maybe 700w into your 8Ω cab.
Thanks. Do you like it as far as the sound/performance? I just played one for a few mins and it sounded good to me with a P Bass. Not concerned about the weight too much; I have a markbass head also.
I don't mind a simple eq section if it is useful, and I think this one is. I want an amp that is warm and sort of "tubey" but will also get somewhat modern sounding. I want to hear new strings but not be all clacky and zippy like say a GK with a stingray type of sound. I have played a ton of bass amps and one of the best I have heard recently was an SVT 7 Pro through one of those heavy Ampeg 410 HLF cabs. I have a good Ampeg PN cab and found a good deal on one of these LH heads and people really seem to like these so why not try it out? Thanks for all the advice!
If you're running one 410 cabinet @ 8Ohms and 850 watts, you'll want to run the LH1000 in bridged mode with a speakon cable. The amp will push around 700 watts that way. I have the LH1000 and two of the Hartke Hydrive HD 410s. I only had one of the cabs for a while and it worked great with the LH1000 in bridge mode. Just remember, even though an amp and cab are both rated the same, that doesn't mean you can run it full volume all the time. You can still damage your cabinet that way if you are heavy on the bass EQ side of it. Just pay attention to your cabinet for any 'farting out'.
Like others have said, tons of power, simple to use, and it's a heavy amp at around 35 pounds. But it's affordable, and I would say very reliable.
As far as tone options, the EQ section on the head does use a tone stack set up. Once you figure out what that means you'll be able to dial in most sounds you could want or need. I've played covers from soft country to heavy metal and the amp has been able to provide me with all the power and tone I've needed.
Like others have said, tons of power, simple to use, and it's a heavy amp at around 35 pounds. But it's affordable, and I would say very reliable.
As far as tone options, the EQ section on the head does use a tone stack set up. Once you figure out what that means you'll be able to dial in most sounds you could want or need. I've played covers from soft country to heavy metal and the amp has been able to provide me with all the power and tone I've needed.
the LH500 through a GK 1x12 was my favorite rig that i ever owned. for my taste, it doesn't get better. i found the LH1000 a bit boomy through a GK 4x10 (or was it a 4x12?), but once adjusted, what a wonderful tone. your taste may well not match mine, but for me, these are way at the top.
I used to own the LH1000/Hartke HyDrive 4X10 cab. I always ran the amp bridged into the cab and it always worked out great.
To my understanding, the bass feeds the mid level, and the mids feed the high level. So a setting of bass-5, mids-5, highs-5, will probably translate closer to bass-4, mids-7, highs -6. I don’t know the exact math, but that’s the idea.
A ‘flat’ EQ on an amp like the LH1000/500 is bass at 2, mid at 10 and treble at 2…..or somewhere close to that.
