Question about t amp tsa 4-1300
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Topic: Question about t amp tsa 4-1300
Posted By: Nikodj
Subject: Question about t amp tsa 4-1300
Date Posted: 22 November 2019 at 8:11am
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hello, this is my first post on the forum, I hope you can understand my English because I'm Italian and I'm using Google translator; after buying several used amplifiers at stock prices which I then resold to friends and locals (e800, tsa2200 and ta2400), I was able to test their good power and robustness coming to the conclusion that they are excellent amplifiers for the price they have ; in the meantime I was looking for 2 subwoofers for my 2 mackie srm 450 satellites and I found 2 old fbt ls100 subwoofers modified with b & c 15nbx100 8 ohm loudspeakers, all for 310 €, of course I bought them immediately because only one new cone costs € 250; but then I had to find a way to supply all the necessary power (2000w) to the subwoofers and I decided to take a t amp tsa 4-1300, after carefully reading the many pages of this forum that highlight the many advantages but also defects of this amp but there are still some things that are not clear to me and I would like to ask these questions to you of the forum hoping that you can help me, I state that my version of t amp is not the last release but it is the model that they sold until a little while ago, the one that has the 3 switches to link the channels between them and the previous owner told me that it was purchased in January 2018; the first question is, using the bridge amplifier with each sub on 2 channels how much power is able to deliver on each sub ?, because I had read that with only low frequency loads the power of reduces enough, however the divers work between 45 and 130Hz; then in the first evening I used the amplifier it seemed to me to hear the subwoofers go into distortion before the amplifier marked the clip: is it really a characteristic that all TSA 4-1300 have? or is it due to the fact that the loudspeakers have reached their maximum range or that the amp being stressed with 4 sub loads on all the channels reduces the voltage enough and then clips first? then another thing that I didn't understand is whether the amplifier is stabilized or not, because I usually do events in places where the voltage fluctuates between 215 and 230v but it also happens to go to country houses where I have sometimes seen voltages below 200v In these cases with less voltage, does the amplifier rupture power or keep it constant, such as the switching power supplies of notebooks or smartphones? then during the first evening of use while I was pushing enough the amplifier (however limited by the dcx2496 to not get in the clip) at a certain point some orange leds lit up on the internal board of the amplifier, I lowered the volume a little and then they turned off, then looking at the pictures of the open amplifier online I saw that each channel has this led, I think it's a sort of thermal protection but it didn't seem to me that the output power was reduced.
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Replies:
Posted By: fatfreddiescat
Date Posted: 22 November 2019 at 1:07pm
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Re TSA in bridge mode, will be your drivers distorting, no need to bridge the amp, only marginal gains due to thermal compression, high risk of burning them out and damage from over excursion. TSA 4-1300 in bridge is way to much for them in general use.
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Posted By: Nikodj
Date Posted: 22 November 2019 at 1:35pm
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Why I should not use the amplifier in bridge, I have always known that better a very powerful amplifier kept low rather than a less powerful one brought to the clip, then in bridge it is the only way to produce to the subwoofers an adequate volume for the srm450 which only really powerful in the mid-highs, I found a good compromise for the subwoofer by starting the limiter of the dcx not exactly before turning on the TSA clip light but making it intervene a little after turning on the last green LED doing so not distorts nothing
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Posted By: fatfreddiescat
Date Posted: 22 November 2019 at 2:37pm
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Fine to use the limiters to prevent the amp clipping or over excursion of drivers, whichever comes first, also of course you can drive the speakers to peak ratings if signal has lots of dynamics so that the coils have time to cool down, so long as not hitting xlim but relying on limiters to prevent thermal overload is a risk as it will reduce the dynamics of the signal when limiting and average power will still increase, with that much available it may only take a matter of seconds before your loudspeakers are burned. I have 2 TSA 4-1300 driving 8 x 1k 15's, ch1 - 2x15= 4ohm ch2 - 2x15 =4 ohm ch3 2x12=4ohm ch4 2x1"comp=4ohm still have to watch the limiters as can still fry the drivers when using the DCX2496
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Posted By: Nikodj
Date Posted: 22 November 2019 at 3:19pm
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yes I was aware of these problems, as the b & c technician told me when I sent an e-mail: you can safely use an amplifier with the program power (2 times RMS Power) as long as the amplifier does not go in clips; since you have 2 TSA 4-1300 you could answer me to the questions at the beginning of the thread like the one on the real power, the internal leds and the stabilization at voltages lower than 230v, etc. thanks
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Posted By: fatfreddiescat
Date Posted: 22 November 2019 at 7:20pm
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Can't answer re led's and minimum voltage, so far always had solid supplies and run on either 1x13 amp each or 32 amp outlet, voltage here is nominal 240V. Re output, there is a review where they tested them, I will try and find it, results have previously been posted on this forum.
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Posted By: fatfreddiescat
Date Posted: 22 November 2019 at 7:21pm
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Here ya go:
From a post by 'Correll': http://forum.speakerplans.com/thomann-tsa-4700-41300_topic89982.html" rel="nofollow - http://forum.speakerplans.com/thomann-tsa-4700-41300_topic89982.html
TSA 4-1300:
1kHz 60Hz_ 1% THD 1kHz (one channel, burst signal)
4 Ohm 3660W 2794W 2047W
8 Ohm 2160W 1624W 1235W
impulse: 3192W @4x4 Ohm @ 1kHz
after 20ms: 2304W @4x4 Ohm @ 1kHz
first 33ms: 2025W @4x4 Ohm @ 60Hz
third 33ms: 1521W @4x4 Ohm @ 60Hz
measured by tools4music.de
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