HERTZDieci Series DCX-1003 4" Two-Way Coaxial Speakers - Pair

These worked great as an upgrade for the factory speakers on the 1978 Mercedes. Great sound for the tiny size. Installation was easy, bu that will depend on your car. For the head unit, we have a RetroAudio Europa. The radio is rated to 25w and speakers are 30w, so a good match.

Great upgrade from stock audio, though it may have required a little extra trimming of metal around the bracket edges. I used this brand/line of speakers to replace everything but the sub, and I remember at least the door panel ones needed trimming.

I have extensive experience installing and using aftermarket audio systems, including expensive speakers, amps, dsp, subwoofers, etc. These speakers produce crisp highs and midrange for a coaxial 4". You should not expect much low bass response below 300hz from these or any other 4" speaker in an open baffle car audio install. On my otherwise factory RX 350 202110 speaker system I replaced all (3) of my 4" dashboard speakers with these. The Hertz 100.3 being 92dB means the volume is about one click higher than before on the same power vs the factory speakers. The details are more crisp, the off axis response firing into the windshield sounds excellent, Hertz states these are designed to work well off axis (that means not pointed directly at your ear). I considered the Infinity 4032 which is about half of the price of these, but the tweeter material on the Hertz is superior so these probably sound better.

I replaced the stock, (non Bose) rear speakers in my 2007 Porsche 911 and was amazed by the sound. I am not a professional car audio installer but had no problems modifying the plate for the OEM speakers to fit the larger 4 inch wide 1.7 inch deep DCX 100.3 speakers. The sound is awesome.

The media could not be loaded. My 2022 IS 350 did not come with the premium sound system. My audio always sounded flat. I decided to upgrade the front dash left and right speakers. Stock was 3.5” and I bought these 4” speakers and installed them by trimming the plastic around the opening. What a difference! These speakers alone have totally upgraded the sound. Crisp highs and even some added bass! First time purchasing this brand. I plan on upgrading the rest with Hertz speakers

I like the purchase and happy with the speakers. I replaced a set of speakers on my BMW K1600GT motorcycle. They sounded significantly better than my stock BMW speakers even without the new amp. With the addition of the amp (300W 2ch) I don't turn it up much past half volume and its loud and clear. These mind you, are 4-inch coaxial speakers. You don't and won't get strong base from these or any other 4 in speaker. But it's what I had to work with. The speakers are strong, and the sound is full and clear. At high volume levels i sensed some distortion so i flattened the base and treble levels and washed the distortion out. Loud and clear is my grade on these, love them and would definitely purchase again.

I replaced stock speakers with the Hertz 100.3 speakers within 2 days of owning my Bronco. I honestly didn’t think the stock speakers were as bad as some made them out to be, but these were still a huge improvement. They excel at midrange, particularly considering their size, without giving up performance on the high end.

I chose these when they were on a great sale and much less expensive than BMW OEM for a 330xi. Yes I did have to get the tools out and watch a few videos but the savings was worth it and I am happy with the quality. It is hard to determine if they are "better" since my old ones had bad cones.