I own two mono TPA 3116 PBTL amplifiers (they look to be exactly the same....one with a Nobsound G2 branding and one with an Aiyima A1001 branding). They are both rated at 100W at two Ohms.....and have identical specs. They both have a 24volt 4 amp power supply
Each amplifier is currently running two different multi-driver speaker designs in two different locations.
With slight variances the drivers are as follows (for simplicity I will round the RMS to the nearest fifty)
8 inch full range 8 Ohms 100 RMS
4 inch full range 8 Ohms 50 RMS
Tweeter 8 Ohms 50 RMS
All connected in parallel = 2.7 Ohms
Thus, with the amplifier at cranked levels, each driver component will be delivered approximately 32 Watts.
At 2.7 Ohms for the circuit, will the full range driver operate at a 32 RMS rating then the four inch and the tweeter at 17 RMS ratings each ?
Or, does the RMS rating for the drivers represent more of a guideline somewhat constant that doesn't change regardless of the total circuit resistance?
Yes, these speaker units are "underpowered", but achieve a relatively distortion free decibel level that is pleasing to me.
Please correct and thank you for any explanations.
Each amplifier is currently running two different multi-driver speaker designs in two different locations.
With slight variances the drivers are as follows (for simplicity I will round the RMS to the nearest fifty)
8 inch full range 8 Ohms 100 RMS
4 inch full range 8 Ohms 50 RMS
Tweeter 8 Ohms 50 RMS
All connected in parallel = 2.7 Ohms
Thus, with the amplifier at cranked levels, each driver component will be delivered approximately 32 Watts.
At 2.7 Ohms for the circuit, will the full range driver operate at a 32 RMS rating then the four inch and the tweeter at 17 RMS ratings each ?
Or, does the RMS rating for the drivers represent more of a guideline somewhat constant that doesn't change regardless of the total circuit resistance?
Yes, these speaker units are "underpowered", but achieve a relatively distortion free decibel level that is pleasing to me.
Please correct and thank you for any explanations.
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An important function of the (passive speaker) crossover is to decouple the driver at frequencies the driver does not support. The capacitor in series with the tweeter adds to the tweeter impedance at low frequencies and the inductor adds impedance to the woofer at high frequencies. And the tweeter is vulnerable to low frequencies, so the capacitor etc. protects it from damage by removing low frequencies. Woofer impedances naturally rise at high frequencies, so it is not uncommon to see a woofer connected without a crossover. A woofer may produce undesirable peaked responses at higher frequencies, so better speakers include a low-pass (crossover) for the woofer. In any case the crossover in effect only connects the driver(s) enabled for a given frequency, so the impedance is relatively constant across the audio band, approximately equal to one driver only.
Yes, and music does not have a flat spectrum, even rock music.
https://www.diyaudio.com/community/threads/spectrum-of-musical-genres.310900/
https://www.diyaudio.com/community/threads/spectrum-of-musical-genres.310900/
Bolded: No. Total impedance will be about 4-ohm.
Tweeter with capacitor filter will have higher than 4-ohm impedance below 5 kHz, so it will not interfere with the 4-ohm impedance of paralleled full-ranges. Above 5 kHz full-ranges have rising impedance because of their inductive component, so total impedance will not drop to 2.7 ohms.
The power handling of the tweeter will relate to the power handling of the entire speaker system, i.e., your tweeter may be used in a speaker system rated up to 50 W RMS.
Because the treble frequencies reproduced by the tweeter in a 3-way system typically represent only 10% of the total power in the music spectrum, the true rating of the tweeter may only be 5 W RMS.
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