Also just so everyone is on the same page the reason or goal originally was for the protection of the speakers. an insurance policy. maybe I decide to transfer these speakers to another car and maybe the other car doesn't have built in low or high cutoff features, I was simply thinking ahead for safety. I also made a disclaimer that I was new and do not know what is the normal methods used in crossovers or speakers in general. Simply I just had ideas in my head of what I thought was standard practice. Rebuilding a transmission taught me to think about things like this, I had to spend 11 months removing, tearing down, and rebuilding a box of endless parts that I didn't know anything about so it taught me to improvise and plan things out like this.
to further elaborate, the reason why I thought protections need to be added to the crossover is because crutchfield has a product they sell called Bass Blockers, and parts express has their own version of that product and they have prebuilt high pass and low pass crossovers which are similar in function. woofers should not try to play too high so than logically I deduced since the woofer needs this protection than the tweeter needed the same kinds of protection of too high of a frequency. I had done research for a while before I started asking questions which is why it seemed so hectic at first. I didn't come up with the concept of speaker protection out of thin air, I naturally asked questions a person learning how to build a speaker system should ask to understand how it works.
Well, woofers don't need protection from the high frequencies.
Tweeters need protection from low frequencies.
Woofers might need protection from the very low frequencies.
It's related to exceed excursion when driven at max power.
Woofers do exhibit a certain mass. Tweeters can vibrate much faster because they are very light.
The human ear can catch frequencies in the band 20-20000 Hz
A tweeter has a natural limit...each transducer has a passband behavior.
The upper limit is called "mechanical crossover" which is dictated by all the components ( membrane, suspensions )
The lower limit is often electrical, well, it's electro-acoustic devices.
Tweeters need protection from low frequencies.
Woofers might need protection from the very low frequencies.
It's related to exceed excursion when driven at max power.
Woofers do exhibit a certain mass. Tweeters can vibrate much faster because they are very light.
The human ear can catch frequencies in the band 20-20000 Hz
A tweeter has a natural limit...each transducer has a passband behavior.
The upper limit is called "mechanical crossover" which is dictated by all the components ( membrane, suspensions )
The lower limit is often electrical, well, it's electro-acoustic devices.
That makes sense, eksine. We all started somewhere!
"Bass Blockers" have been around for decades, it's just a capacitor packaged to cater to the average consumer.
Most car stereo shops either didn't have accounts with places like Digikey back then, or didn't want to bother soldering one up. In addition, it was easier to sell a fancy prepacked solution to a customer instead of pulling a little can out of a drawer and try to explain why they needed to pay for a "capacitor". So, they sold pretty well as "Bass Blockers", well enough to still be around today.
Like pico was explaining, speakers have upper and lower frequency limits.
If the lower limit is exceeded at a high enough volume, it can cause damage due to to the cone/dome moving beyond it's mechanical limits. Sound-wise, the additional movement is counterproductive, because it's in a range where the speaker isn't producing useful output.
If the upper limit is exceeded, there is no risk for damage. But since the speaker can't play accurately up that high, it may not sound as good. Again, not producing useful output. In addition, if there is another speaker (tweeter, for example) taking over that frequency range, you may don't want two speakers overlapping their output. That can be counterproductive.
Therefore, we impose a low-frequency limit for safety and to be sure the speaker is being used efficiently.
We impose a high frequency limit to clean things up a bit, when it's helpful to do so. Some speakers go into their high frequency roll-off gracefully enough that it's not necessary to limit them.
"Bass Blockers" have been around for decades, it's just a capacitor packaged to cater to the average consumer.
Most car stereo shops either didn't have accounts with places like Digikey back then, or didn't want to bother soldering one up. In addition, it was easier to sell a fancy prepacked solution to a customer instead of pulling a little can out of a drawer and try to explain why they needed to pay for a "capacitor". So, they sold pretty well as "Bass Blockers", well enough to still be around today.
Like pico was explaining, speakers have upper and lower frequency limits.
If the lower limit is exceeded at a high enough volume, it can cause damage due to to the cone/dome moving beyond it's mechanical limits. Sound-wise, the additional movement is counterproductive, because it's in a range where the speaker isn't producing useful output.
If the upper limit is exceeded, there is no risk for damage. But since the speaker can't play accurately up that high, it may not sound as good. Again, not producing useful output. In addition, if there is another speaker (tweeter, for example) taking over that frequency range, you may don't want two speakers overlapping their output. That can be counterproductive.
Therefore, we impose a low-frequency limit for safety and to be sure the speaker is being used efficiently.
We impose a high frequency limit to clean things up a bit, when it's helpful to do so. Some speakers go into their high frequency roll-off gracefully enough that it's not necessary to limit them.
The bass blockers that I used to see had a drain resistor across them to prevent them from making a 'tick' when the amp was powered up. It doesn't always happen. It depends on the amplitude of the signal when the amp shuts down. Sometimes it leaves the capacitor with a charge that discharges when the amp circuit is engaged.
I think so but it was that was a long time ago ('80s). Photos online should show the bulge from the 1/4w resistor under the heatshrink.
The Infinity Emit tweeter has a frequency response from data until 45KHz.
The Dynaudio MD100 has a frequency response with a roll-off from 18KHz circa.
If we consider the uman ear the MD100 is a more rational tweeter.
So, why Infinity have produced the Emit and much expensive?
No one arrive to listen fundamentals until 20KHz, but yet we can mean that Emit get more high to frequency and the sound change.
These are the harmonics.
A passive crossover or a speakers system it's calculate with mathematic formulas, but at the end is perfected with ears.
Break up distortion in the high side not is for tweeter, so a tweeter can't need a low pass.
If two speakers overlapping their output, if possible we would to know it.
This is the why i asked many times. 😱
The Dynaudio MD100 has a frequency response with a roll-off from 18KHz circa.
If we consider the uman ear the MD100 is a more rational tweeter.
So, why Infinity have produced the Emit and much expensive?
No one arrive to listen fundamentals until 20KHz, but yet we can mean that Emit get more high to frequency and the sound change.
These are the harmonics.
A passive crossover or a speakers system it's calculate with mathematic formulas, but at the end is perfected with ears.
Break up distortion in the high side not is for tweeter, so a tweeter can't need a low pass.
If two speakers overlapping their output, if possible we would to know it.
This is the why i asked many times. 😱
It would be good also to look at some of the values in typical established crossovers, this will display the differences from what the online calculators/mathematical models will provide.
Also to spend some time tweaking and adjusting an existing design will help you get a feel for the weight of each adjustment. Is easier to do this with one speaker at a time, using one left unmodified as a reference.
Can also search for “Lpad calculator” for some insight into that, if you haven’t already.
My car has a recreation of some old JBL 4406 studio monitors in the stock locations, using the original tweeters, newer woofers, and original schematic for the crossovers.
Also to spend some time tweaking and adjusting an existing design will help you get a feel for the weight of each adjustment. Is easier to do this with one speaker at a time, using one left unmodified as a reference.
Can also search for “Lpad calculator” for some insight into that, if you haven’t already.
My car has a recreation of some old JBL 4406 studio monitors in the stock locations, using the original tweeters, newer woofers, and original schematic for the crossovers.