... I recently replaced my 3.5" center speaker with a Polk 4 ohm speaker. You want to talk about a massive upgrade to the sound! It was much like getting a high quality center channel speaker for your home theater system.
It pulled out the muddled mid-range only sound and gave both volume and vibrancy to music...
Good INFO, but what did you do about the ohm difference? ...
I didn't worry about it. I upgraded the doors with Alpine 610s, which are also 4 ohms, and then Polk tweeters, which are the same. Everything is working beautifully together. After installing I just had to tweak the speaker output to rear bias slightly more in the MFT to balance out the sound.
A few comments not to criticize
Re: 4 Ohm instead of 8 Ohm
+ Though there may be some
risk to the Audio Unit power output circuits, from what I've gleaned as a non-expert, the risk may be less in low-powered systems (ours certainly is that), the risk may be long-term, the risk may be less if not played at high output (volume) consistently, and then again the system may tolerate it just fine forever. It's worth noting that the "Ohm / impedance rating" of speakers is a nominal-average-artificial-number, the actual
impedance of a speaker constantly varies with frequency and power level.
+ All other things being equal (Audio Unit volume setting and speaker sensitivity) the 4 Ohm speaker will be louder than the 8 Ohm speaker. That means that the 4 Ohm front center speaker will be more prominent relative to the front L/R speakers 'out of the box'; lacking a separate control for front-center relative to the front L/R speakers, the only way to reduce the level of the front center speaker in the overall mix is to bias the sound to the rear which of course reduces the front L/R volume along with the front center relative volume to the rear
Re: The Sound "Effect"
Listening to music is like looking at art ... first and foremost the old saw "I may not know 'good' art but I know what I like" applies absolutely
. What is "right" for each of us is not the same, in terms of both music tastes and the audio effect delivered to our ears.
+ From his description of the mod and adjustments I strongly suspect that in comparison
to the 'effect' of my system, Spider Pig's has much more center prominence, much less L/R distinction from the front
, and much more bias to sound originating from behind the driver. Not saying one is right or wrong, just pointing out the likely comparative differences .... "right / wrong" is in the ear of the beholder.
Bottom line - if you like the sound of your system for your music, that's all that counts.