Driver Testing

[gregrueff]

RS100-4 Results:

Frequency Response


Harmonic Distortion
12" @ 96 dB fundamental

[gregrueff]

RS100P-8 Results:

Frequency Response


Harmonic Distortion
12" @ 96 dB fundamental

[gregrueff]

DA115-8 Abbreviated Results

Harmonic Distortion

[Billet]

That RS100 looks pretty excellent on paper. The DA115 looks very good also, I have used both and I actually prefer the sound of the DA115. Probably because of that rise in the upper bass and the dip in the lower treble, I'm guessing.

[gregrueff]

I’d actually tested the RS100-4 a while ago and only just got around to posting the results.
I’ve been curious about and wanting to test the RS100P-8 for ages.

I was surprised it exhibited a 5dB peak breakup (the data sheet indicates it’s a touch smoother), but also surprised at how low HD3 is between 250Hz and 1kHz. Pretty impressive for a driver of this size. It matches the MCM in that regard and has way smaller cone area.

Somehow the PC105-8 is still better above 2kHz, lol. Best budget driver ever!

[gregrueff]

PC68-4 Abbreviated Results:

Harmonic Distortion

[gregrueff]

TC7FD00-04 Abbreviated Results:

Harmonic Distortion

[gregrueff]

TCP115-4 Abbreviated Results:

Harmonic Distortion

[PWR RYD]

TCP115-4 distortion looks pretty bad. Just like I measured and heard with my quad.

[gregrueff]

I've spent some time looking for bass drivers that maintain the HD3 at around -50dB from LF cutoff up to around 200-300 Hz. My experience with a driver this small is that you need a state of the art motor like in the E150HE-44, and then it still exceeds -50dB around 90Hz if the published data is to be believed. Alternatively you could use a larger cone area like in the RS225A (which is one of the best 8" around in this regard if I remember correctly) and it exceeds -50dB around 50Hz.

Both of those drivers are vastly more expensive than $12.

I hear what you're saying, and I don't think anyone is claiming these little monsters are state of the art, but they sure dig deep in a small package!

[Wolf]

It's second order mostly, so it's 'pleasing' HD that is highest. The 3rd order stays a lot lower.

[gregrueff]

RS75T-8 Abbreviated Results:

Frequency Response

The dip around 1.8 kHz is better (smaller) than the factor data on Dayton's website makes it out to be.

Harmonic Distortion

[Wolf]

650-5kHz looks really doable.
Wolf

[gregrueff]

Yeah if I remember right, it runs out of Xmax around 500 Hz LR2 somewhere between 100-105 dB. That's still pretty low because man, this driver is tiny! I think it's a very high performing driver for how small it is. And it looks pretty.