Spark CAB - Video No.5 - Cab hiss
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- เผยแพร่เมื่อ 16 พ.ย. 2023
- SPARK CAB - VIDEO NO.5
Addressing the hiss. If your cab is producing a loud low frequency hum (not a hiss) then you likely have a ground loop issue. If your cab is motorboating you may also have an issue. As I explain in the video - please trouble shoot any issues you have extensively first. Understanding the way your gear and cables are interacting with your power is very important. - เพลง
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I have Spark CAB plugged it into a filtering power conditioner - it is not NORMAL to have 20 db of white noise at 12 inches from the speaker with nothing pluged in and volume at 0 - (what I measured with mine). I have yamaha FRFR speakers - they are dead quiet . The white noise has nothing to do with the power supply source - the hum when you turned up the volume might( I don't have that issue). The white noise is a design flaw. IMHO as a retired Electrical Engineer who worked for decades doing audio development in consumer electronics at Intel - positive Grid cut corners to hit the price point.
The reality is, when played at its intended volume, background noise isnt noticeable. Its no more noisy than my class a/b mesa boogie poweramp worth nearly 5 times the amount
I have the Spark 40 and was considering buying the Cab, but will look at other options now. I don’t want to risk buying one with hope the noise is minimal.
great video (and set of videos for this cab). You mentioned you’re plugging into a Furman power conditioner. Which one are you using? They seem to be pricey, so not sure i want to get the conditioner, but may invest in a cheaper furman power strip that seems to reduce some hum as well (though likely not as much as conditioner). Cheers, and thanks again for all your videos. You rip on guitar by the way!
Thanks mate. I use the pl8ce
I will send mine back because of the unacceptable hum issue and the very unprofessional handling of this issue by PG. Happy with the Mini and Go though.
A FRFR is the same as a normal PA system, in my opinion, so I have ordered the JBL EON 710 now as a) the digital amp should not have a noise issue and b) it has a built-in DSP/EQ (need that to get the optimum sound in my sofa-practicing setup in my living room :-))
OK, it is a "little" more expensive but after the PG Cab disappointment I needed to make a "frustration" purchase...
Kind regards🍻🍻🍻
Got a Spark Cab , noise is there its not really that big of a deal . My modeler sounds great played though it. Don’t regret getting it.
It is not normal. This is BS. It's not a little noise. Also, everybody is complaining. This is unacceptable. I can't believe you all are trying to act like this is normal.
I took a video of my bands expensive yamaha pa monitors and the hiss was twice as loud. The thing is, you dont hear it when playing at band volume. Why get the cab if not to play loud. As i demonstrate in the video, the noise doesnt increase as the volume of the unit is increased. I could be one of the lucky few however, others in our spark group have reported no noise.
@@papalytic7767this is what everyone else is hearing. Is this what you are hearing? Would you call this "natural hiss?" th-cam.com/video/ebZbC4QJbqc/w-d-xo.htmlsi=ywoKkLwJWa3A5SIF I have two of these that respond the same way and the "hiss" gets louder as I roll up the volume.
It's junk and going back. I have never had any of my amps hum like this. I have an electronics engineering degree, it is a ground fault loop or shoddy components period. It's junk and going back. I don't care if your pa makes noise or not. I did not purchase it.
@13druber ok, you were possibly an unlucky one. Mine doesn't hum and the hiss is minimal. I guess im the lucky one. If i had your education id fix it myself. Im a guitar tech. I spent $5k on a faulty ibanez jem, fixed it myself, documented it and contacted ibanez about it. They gave me $500 back. More than covered my time. Now i have a perfect guitar. Just saying.
@@papalytic7767 I don't have the schematic for it.
I have the same issue. This is most likely transistor junction (Johnson) noise which is common in Class D amplifiers that are poorly designed. I have Yamaha powered speakers with no noise, and Behringer powered speakers that have varying levels of noise with each unit. Hopefully Positive Grid will determine the circuit causing the issue and develop an updated amplifier for the cab.
Its possible, but unlikely
@@papalytic7767yeah no way will they fix it.
Take the front grill off and it is gone :)
Let me know if it worked. At least give it a try. We had the same problem and we think it comes from the grill after we removed it its gone
Isn’t the hiss the result of the amp’s output not being line level but rather headphone level?
What is "a small amount " ?
I thought a fan was on when I turned mine on
Mine couldn't be heard at talking level. And its not perceivable when i did my other video with pink floyd at the end and that was relatively close mic'd. Also when used at band practice level, it could absolutely not get heard.
@@papalytic7767when did you receive your unit? Was it before everyone else who received their pre-ordered units? I have two units and their hum sounds nothing like yours. I bet if you ordered one today, anonymously, you'd get one with the whooshing defect we're experiencing.
Ola did a review, he thought it may have been too bass forward. Have you experienced that ?
When i had it at volume for band practice it was perfect. Everyone was impressed
It makes the noise with no amp or cables connected. The noise is about the cab. I have good cables and have tried other power sources. I have never owned an amp that makes as much noise just idling before and I have owned many Amps over the years.
As i mentioned in the video. The noise reduced once the spark 40 was turned on and connected. With the cab above volume 2 or 3 any white noise should not be perceivable, also that noise wont be transferred to a connected p.a system. If you are getting intolerable noise you may have a dud cab or you are getting interference from other electronic devices as otherd have discovered to be the case. Some have told me that simply by moving the cab away from certain electronic equipment it greatly improved the noise issue
When my Spark Go is connected to the cab, and I'm mot playing....I hear no noise. With that being said...I do have the cab all that loud....probably 2 or 3.
@@TheChicagoTodd When did you receive your cab? You must be one of the lucky ones if yours is quiet, or you have some background noise in the room already?
Maybe a different power supply or connector from amp to cabinet
Is the metal behind the cloth of the grill.
Im not sure i understand your question
@@papalytic7767sorry, my friend just got the cab and we tryed it out and when it got louder and he used some fuzz it started to make this weird noise. We pulled the grill off to see if the speaker cone hits the grill and we found that on the inside is a huge metal piece on the grill under the cloth and that makes the noise. It starts to vibrate under some higher volume and distortion.
are you by the ocean.? its an issue that needs to be addressed
i returned mine because of annoying buzz sound, even when i turned the volume off entirely the noise was still there. also way to much bottom end.
Its not that bad on mine. I had to put my ears very close to the cab just to hear the hum.
It's not even the problem people are having with Positive Grid Spark 40-Watt amp. Pure white notice comes out of the amp and it's from the impute jack board. The jack needs to be replaced it's faulty. At the end of the day Positive Grid Spark 40-Watt has a chep impute board that fails and need to be changed. The issue is finding someone to fix it that doesn't cost an are & a leg or that is familiar enough to do the board swap!