Samson SX3200 Amplifier Question? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 4 Old 05-30-2019, 10:58 AM - Thread Starter
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Samson SX3200 Amplifier Question?

Hi All:
There are a few threads regarding the Samson SX3200 Pro-Amp; however, they are really old threads and I think it would be better to ask my question in a new thread, in state of bringing back the long dead threads. Anyway, I just purchased two like new Samson SX3200 Pro-Amp, link below, from a family friend and so I know for sure that the amps are very new with light usage.

http://www.samsontech.com/samson/pro...series/sx3200/

I'm intent to use one of the amp to run in stereo mode two InRoom Triad Gold subwoofers, a 15" 4ohm passive sub, which is currently driven by a Crown CE 4000 amp. The Samson is rating at 1100W/ch in 4ohm, so it should has more than enough power to drive these subs. My preamp is the Marantz AV7702 Mkii and connected to the Samson via XLR cables for the Marantz Subwoofer 1&2 out. The Marantz XLR output is rated at 2.4V, so it should have more than enough voltage to drive the Samson which has the input sensitive of 1.4V. After using the Marantz Audysee 32XT to EQ the subs, the gain knobs on the Samson is set at near its half way point. My questions are below:

1) With the gain set at around 1/2 way, and even when the volume is near the Ref. level on the Marantz and using some heavy bass materials, the Samson Signal LED lights (not the Peak lights) are nearly never lit up, I can only see a very few times they did light up. The Peak lights are never lit up. The subwoofers are working and produce sound, so I know the amp is working, but don't know why the signal lights won't light up. The manual says it should light up whenever there is an output to the speakers. Anyway, is this normal for the Samson amplifier? The signal lights on my current Crown CE4000 is always lit up with every bass notes, even at a much lower volume.

2) This is more of a sound quality observation than a question, the bass from the Samson amp is, for lack of a better word, incoherent. That is all the bass notes seem to stuck together or lingering together and not separated out in a well define space, compares to the Crown CE4000. I tested this by turn off the main front speakers and let only the subwoofers playing. With the Crown, I can hear (feel) the individual note hitting my chest, with the Samson, all the notes are just on top of each other into a long and loud mess. Anyway, that is just my observation, there is nothing to adjust on the Samson amp, so I think that is just it. The Samson does sound really good, when not using as a sub amp, driving my front speakers. But again, the signal LED lights won't light up here as well! it's really a shame as the Samson amp does built like a tank with a huge toroid.


Thanks for reading!
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post #2 of 4 Old 05-30-2019, 01:41 PM
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I have 2 SX2400's powering my mains and like you have noticed my amps do the same only when really pushing them very hard as in +2 to +3.5 on my Denon rcvr will I get the lights to come on most of the time they flicker not a steady on. Cannot comment on the sub question as I have different amps for my subs. Just my opinion even though they are rated less then the nu3000's to me its a much better sounding amp.

Denon AVR-4520 LCR BIC PL89ii's w/ 2 SX2400 amps, Volt6 front height w/nu3000, Volt6 rear height w/EP-2000, BIC DV84's w/EPX2800
Infinity1262's in Quad Opposed box w/ nu6000,SI DS4's in 2 sealed Marty Cube w/ IT 8000, 2 SI HST18's in Dual Opposed w/ A14K
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post #3 of 4 Old 05-30-2019, 01:49 PM - Thread Starter
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Quote:
Originally Posted by Cichlid109 View Post
I have 2 SX2400's powering my mains and like you have noticed my amps do the same only when really pushing them very hard as in +2 to +3.5 on my Denon rcvr will I get the lights to come on most of the time they flicker not a steady on. Cannot comment on the sub question as I have different amps for my subs. Just my opinion even though they are rated less then the nu3000's to me its a much better sounding amp.
Thanks for let me know! don't get me wrong, the Samson sounds really good when power my fronts, but not with the sub. I need to play with it a bit more to find out why...
BT
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post #4 of 4 Old 12-25-2019, 05:39 PM
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The Signal lights on the samson, work much like a row of 6 leds would from minus 40 to zero db. The more signal that is applied, the longer and brighter the signal liight will come on. Very little signal, and she will not even light up at all. The more signal the longer she will light up for.

The level controls on an amplifier are in fact ATTENUATORS. They have zero gain function. So if you have the need to attenuate the amp half way as you are doing now, you saying you do not need the full power of the amplifier to get a reliable signal output, from the current signal input applied.

I would suggest operating the amplifiers without attenution, and using adjustments in your preamplifier to make changes in level. I use the SX 3200s in bridge mode, and have no problem lighting the signal lights, but these signal lights really do not tell you much in the first place.

If your running two subwoofers with the one amplifier, I would suggest wiring the subwoofers in series for an 8 ohm final speaker load, and then driving them with the Samson SX 3200 bridged. One always gets better performance from an Amplifier in bridge mode.

2.4 volts on an XLR output sounds pretty low also. The standard for XLR to get full power from a 1.44 v input is 4 volts.

https://******************.com/index.php?topic=459.60
A Good amplifier requires a adequate power supply, It does not matter what the amplifier is capable of if the power supply will not provide the power required. Most amplifiers have under rated power supplies. It is up to you to make sure you get the ones that are least under rated if at all.
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