Live Sound & Production

[Bobby1Note]

Thanks Chris, I'll take a look at the manual, and the controller. I just wanted to say that I listened to the PS8's last week, stand-alone (no sub), and I was amazed at the performance of that system. Like "Mini-Me" on steroids.

("Mini-Me",,, from the movie Austin Powers)

[chrispeters]

yeah they fantastic , the ps10 are even better P ... when they running correctly lol

[Pro Sound Guy]

There controller uses works as a closed loop system?

I have experienced servo sensors on subs to monitor cone motion.

The cone motion is then compared to the actual signal input and corrected.

This reduces harmonic distortion big time.

Real tight nice sub bass.

This technology has been around since the 70's.

I have never heard of voice coil temp monitoring and all that.

That would mean like a thermistor to monitor temp and so forth?

This is kinda interesting.

[agedhorse]

I have designed many products that monitor (or are designed around) temperature by averaging the electrical power and translating an electrical power curve to thermal power. Been doing if for maybe 15 years.

[Bobby1Note]

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Pro Sound Guy wrote:

There controller uses works as a closed loop system?

I have experienced servo sensors on subs to monitor cone motion.

The cone motion is then compared to the actual signal input and corrected.

This reduces harmonic distortion big time.

Real tight nice sub bass.

This technology has been around since the 70's.

I have never heard of voice coil temp monitoring and all that.

That would mean like a thermistor to monitor temp and so forth?

This is kinda interesting.

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Yeah, I've got an old VeloDyne subwoofer (ULD-15), with a servo-controlled woofer. Great sounding, very "tight" sub, and purchased in the early-to-mid 80's.

[chrispeters]

all them facts are impressive...

but i still get a horrible earth like buzz off a 700 quid controller hahahaha , worth peanuts bypassed and going thru the aux on my desk lol..although the ps10 sound miles better thru the controller than running straight off the desk, i will give em that

[Bobby1Note]

Chris,,,, I haven't had time to read your manual yet, just a few pages. The very first thing I noticed, was that the PS10TD R2 "MUST" be earthed. They were very emphatic about that.

Also, a bit later on in the manual, they say that "hi-gain" amplifiers can be problematic with that controller. They recommend no-greater-than 26dB gain if I remember correctly.

[Pro Sound Guy]

Aged said: I have designed many products that monitor (or are designed around) temperature by averaging the electrical power and translating an electrical power curve to thermal power. Been doing if for maybe 15 years.

If this is the technology used in this controller then using subs that are not NEXO and matched for the controller would be a real issue then as far as this design you speak of?  Because the translation to thermal is assuming a NEXO sub is connected to the system?

I say this because I think the OP is not using NEXO subs?

[Bobby1Note]

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Pro Sound Guy wrote:

Aged said: I have designed many products that monitor (or are designed around) temperature by averaging the electrical power and translating an electrical power curve to thermal power. Been doing if for maybe 15 years.

If this is the technology used in this controller then using subs that are not NEXO and matched for the controller would be a real issue then as far as this design you speak of?  Because the translation to thermal is assuming a NEXO sub is connected to the system?

I say this because I think the OP is not using NEXO subs?

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He mentioned earlier, that he's using an FBT active sub.

[agedhorse]

Correct, the sub protection will not be effective for the subs because there's no relation between the two different subs.

[Bobby1Note]

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agedhorse wrote:
Correct, the sub protection will not be effective for the subs because there's no relation between the two different subs.

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I don't see how he'll have protection to his tops either. The processor requires that it be used with amplifiers that have "sensing" capability. I haven't had time to read his powered-mixers' manual yet, but I seriously doubt this would be the case (DynaCord powered mixer)..

When using the Nexo amp (NEXAMP4X1 or NEXAMP4X4) the three components (processor.amp,enclosure) work together to monitor excursion, voice-coil temperature, and voltage correction.

Nexo suggests that the PS10 enclosures can take 2000w/ 8 Ohms with the proper combination working together. I doubt this analogue processor (PS10TD R2) would allow anywhere near that level.

[chrispeters]

This has been solved today ... the rep explained that the sensing comes from the speakon connections from dynacord to the controller nothing to do with the amp , its all about the cables , so the left and right nexo is sensed now using adapted speaker cables( NOT the sub though as it is not nexo so wud be pointless) .its all about the controller that Senses the temp and stuff from the amp as long as the sense wires are connected properley to the speakons... The controller is designed to be used with ANY power amp . where the actual HUGE nexo amp has the controller built into it....

As it happens the nexo rep was in my local audio center today so i dragged all my gear down and set it up in the shop lol .

The 2 Xlrs cables to jacks .. run from out left and right controller into the inserts of the dynacord was unbalanced , all we did was change these to balanced cables and the problem was gone immediatley.

Now i have my foreign FBT active sub coming out the controller , ok its not sensed , but it works fantastic ( the controller sets it up as if its a nexo sub...) NO MORE BUZZ ..woohoooo

Sounds brilliant , even the nexo rep was surprised to how good the active fbt sub sounded wen connected to the nexo controller, very happy !

[agedhorse]

Correct, the feedback comes from the amp outputs back to the processor.

One challence will be that the processor is applying the Nexo sub eq and HPF, so this also may make assumptions regarding low frequency cutoff that may not apply to your sub. That leaves all of the protection to whatever processing is in the sub itself. Maybe it will be fine, but keep an eye on the limit LED on the sub.

[Bobby1Note]

Chris,

That's just great news. Glad to hear it was such a minor fix.  Would you please keep us posted for the next little while? I for one, would really appreciate it. If your sub-solution works out alright, I may try the same.

[chrispeters]

i have a gig on sunday night in a rather large venue , i will let u know how i get on

[chrispeters]

gig was great ..

NO buzz with the new cables , sensing worked a treat .

The stage was quite narrow and in a corner so the nexo was only like maybe 5 metres apart which is not ideal at all . i had plenty volume in the tank from the dynacord and the fbt bass bin thumped away happily .

The nexo was unbelievably smooth and clear , the sound is just sweet from these babies and i am not even tickling them with my very little 500 watt per side , but honestly these do not need loads of volume to make them sound sweet , plus they wudda drowned out my active sub lol .

this was a venue that held 150 people and i was nowhere near the limits on the dynacord , so i was happy with that. All in all a very positive experience and cant wait for my next gig where i know i will have more room on stage ( smaller capacity room though )

My wife said the nexo sounded as sweet at the back as they did at the front , the bass was there giving a nice full sound although not pant wafting sound .

If i had any picks...maybe another active bass bin in the future sometime will give me a better sound and a more balanced system , but that can be a few months down the line .

[Bobby1Note]

This is excellent news Chris,,, thanks for sharing.

How did it go as far as matching the FBT sub to the PS10's?

What mains were you previously using, and can you describe the most obvious differences in the "new" sound, compared to the previous system?.

I wish everybody had a chance to listen to a system like this. These Nexo's are a take-no-prisoners system. Wonderful !!!

[chrispeters]

i actually prefer the FBT sub to the Nexo sub to be honest ..

But the mains are untouchable , i used to use FBT promaxx 14a for my mains .

The nexo blow them out the water in terms of smoothness , clarity , Throw and looks lol...

and they way smaller , but a little heavier.

Not quite as loud , but they sound sssoooo much sweeter...its like night and day , totally different sound .

The FBT got very tiresome at high volumes and was way too harsh , the nexo are FAR from it. Just leagues better.