Im I driving my amplifier on too low impedance ?  - Page 1
Forum section: electronics / beginners

author: Matthew98
author_rank: Regular Contributor
timestamp: March 05, 2017, 07:21:25 pm
content: Hello. Im little worried now, as I add those (really sorry I added those, I just wanted to try them and they turned out to be quite decent)http://www.ebay.com/itm/2-x-500-Watts-Super-Power-Loud-Dome-Tweeter-Speakers-for-Car-500W-NEW-HQ-/112236855425?hash=item1a21d68081:g:Sq0AAOSwnHZYUUAVtweeters in parallel to my 4speaker, which is attached to my 2x150W Tesla discomix 8-480 . Dont worry, im not listening to them casually ... it has some pretty staticBut back to my question. The amp. is made for 4now, as i give it anything less than that, i risk damage. I know. And as i attach anything in parrael to the speaker, its impedance will drop. I know that as well. But. Its the minimal impedance in all spectrum. So adding the tweeters, which work in different spectrum might not overload it, as the mid-bass speaker has high impedance in high spectrum ? Does that makes sense ? Thanks

author: Matthew98
author_rank: Regular Contributor
timestamp: March 05, 2017, 07:25:39 pm
content: Meserued it and its 3.8(I have a ESR meter, which can measure all sorts of things) Is that too low ? I dont want to blow my amp

author: SeanB
author_rank: Super Contributor
timestamp: March 05, 2017, 07:31:45 pm
content: It is a piezo tweeter, so will only have a capacitive load, and will have no effect on the car amplifier. They might be called 500W ,but that is not what they actually are rated at, only that the speakers they can be used on are up to 500W maximum, at 150W they will be fine. Added load is around 1n per tweeter, your wiring might have higher capacitance from the amplifier to the speakers, and the thin wire to them also is an indication they are low poer devices.As ESR is 3R and change, what did the capacitance come to, and if you listen close you can hear the test sequence as well. In any case no speaker is close to the nominal impedance, it will be higher and lower along the response curve, for most voice coils rising with frequency generally ( but can dip at resonances) and with capacitors dropping with frequency till it levels off somewhere at the ESR roughly.

author: wraper
author_rank: Unknown
timestamp: March 05, 2017, 07:39:48 pm
content: Throw this garbage into the trash bin.QuoteDunno how adding a piezo buzzer may sound "decent".

author: Matthew98
author_rank: Regular Contributor
timestamp: March 05, 2017, 07:40:06 pm
content: Not sure about the piezo :/ When i taked it apart, there was coil around the membrane, so I assume, the membrane is magnetic and the tweeters are electromagnetic ?I might post bad tweeters... those are not what i bought, just seems the same

author: Matthew98
author_rank: Regular Contributor
timestamp: March 05, 2017, 07:41:43 pm
content: Quote from: wraper on March 05, 2017, 07:39:48 pmIt may be garbage, but its enough for collage partyIm not into buying audiophile speakers and then wash puke out of them...Btw. If anyone is dying to see this beauty, here it is

author: Seekonk
author_rank: Super Contributor
timestamp: March 05, 2017, 08:09:02 pm
content: It was 40 years ago I saw my first Braun tri amped speaker. It had 60W for the bass, 15W for the midrange and 1.5W for the tweeter. Tweeters don't need a lot of power.On a side note, my wife and father are hard of hearing. There isn't a hearing aid in the world that can make their life normal again. It is a world of isolation. Hope you have a good time and it is worth it.

author: Matthew98
author_rank: Regular Contributor
timestamp: March 05, 2017, 08:18:27 pm
content: Sure, I understand it is rated for 500W and its power is not 500WI would be deaf alreadyBut now, understand, that this is for having fun with friend. Now, when i pass my final exams our class is planning to go somewhere near river and celebrate it. I wont stand in front of those things...It will make the event much more fun.My point was, that they add the high frequencies and it sounds quite decent. It is actually pleasing to listen toBtw. sorry for your loved ones, but there are so many worse thingsin our small town is a girl, which cant work and is not the sharpest from birth. Thay are quite lucky compare to her...Dont look at it from negative point of view...I know I look like a dushbag from what you read, but as I dont smoke, last time got drunk year ago and my school results are one of the bests might change your mind a little...

author: Benta
author_rank: Super Contributor
timestamp: March 05, 2017, 08:24:18 pm
content: At least they're cheap.But how can shipping be just 50 cents?

author: Matthew98
author_rank: Regular Contributor
timestamp: March 05, 2017, 08:28:05 pm
content: Its free most of the times.I belive those sellers buy a ultimate shipping in their country, so they can send as many packages as they want for some amount of time. They goverment might sponsore it as well. But im not sure...i was just curious what can tweeters for a dollar do, but they turned as great combo with the cheap power speakers set...I was just surprised as you ...