Hi there.
Do you know the specs for these speakers? Interested in knowing an estimate of FS and Qts of the buffer.
I can measure impedances and get the parameters, but I'd like to have an idea to avoid getting something I won't use.
I see them listed for 5USD each here. Wondering if they can be useful for some low-watt project.
Regards.
REV 02
DELCO ELECTRONICS
16208051
36908N 0422
MADE IN CHINA
8 OHM
4H54E
I found this looking up the image:
Size: 6X9"
MAX: 240 Watts
RMS: 30 Watts
Impedance: 8 OHMS
Frequency: 50 - 20 KHZ
Sensibility: 90 dB
Magnet weight: 8 Oz
Coil: 20 mm.
Depth: 67 mm.
Do you know the specs for these speakers? Interested in knowing an estimate of FS and Qts of the buffer.
I can measure impedances and get the parameters, but I'd like to have an idea to avoid getting something I won't use.
I see them listed for 5USD each here. Wondering if they can be useful for some low-watt project.
Regards.
REV 02
DELCO ELECTRONICS
16208051
36908N 0422
MADE IN CHINA
8 OHM
4H54E
I found this looking up the image:
Size: 6X9"
MAX: 240 Watts
RMS: 30 Watts
Impedance: 8 OHMS
Frequency: 50 - 20 KHZ
Sensibility: 90 dB
Magnet weight: 8 Oz
Coil: 20 mm.
Depth: 67 mm.
They wouldn't be worth $5 to me...what do you want them for, what's your project?
The listed specs are mostly meaningless, and just judging from the pic and everything else, I'm not impressed, you can do much better for not a lot more.
Mike
The listed specs are mostly meaningless, and just judging from the pic and everything else, I'm not impressed, you can do much better for not a lot more.
Mike
Thanks for your replies.
I would like to test with high-Qts from 50Hz to 120Hz. Something Open baffle in small room.
For instance dipole buffers. My goal is to see how much a simulation matches what I get. More than getting great results.
So that later I can get better informed decisions before importing drivers, which is not too expensive here but I don't really have the option of returning them once they're here.
I see. Is there a similar one you know so that I can simulate and get a rough idea?
I would like to test with high-Qts from 50Hz to 120Hz. Something Open baffle in small room.
For instance dipole buffers. My goal is to see how much a simulation matches what I get. More than getting great results.
So that later I can get better informed decisions before importing drivers, which is not too expensive here but I don't really have the option of returning them once they're here.
I see. Is there a similar one you know so that I can simulate and get a rough idea?
The Delco products of my youth were worth using for relatively inexpensive HIFI and later, HT apps, but today's dirt cheap electronics allows garbage spec drivers, so assuming you don't have the necessary electronics, recommend working with something like the HERTZ brand available locally if not too expensive.
Thanks. I do have electronics around.
Thanks. I'm curious about this one. I'll test, measure specs and report back.
If these speakers are sold on Aliexpress or Taobao, you could browse the review section. Occasionally some kind folks would provide measurements of their own.
For my two cents/dimes/pence worth >
I will say there is 2 completely different worlds of Car Audio equipment, including speakers.
Some products are probably best described as 'toys', however, there other products that have
seriously high tech/quality engineering! Although wrapped-up in a world of 4 & 2 ohms,
there are drivers that have serious Home HiFi credentials when wired in series.
Some drivers are even a bargain 🙂
I will say there is 2 completely different worlds of Car Audio equipment, including speakers.
Some products are probably best described as 'toys', however, there other products that have
seriously high tech/quality engineering! Although wrapped-up in a world of 4 & 2 ohms,
there are drivers that have serious Home HiFi credentials when wired in series.
Some drivers are even a bargain 🙂
Too late, got two pairs 🙂
They're listed as new, wondering. They have 119 pairs available and have sold more than 50 pairs. There are about 13 reviews, none of them negative.
I see that GM is the owner of the factory that makes many car brands here.
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That's a very broad statement that doesn't quantify any of the car speakers that were supplied with actual parameters during my time in car audio.
Certainly an 80 Hz Fs is reasonable for driver sizes you'd expect that from, but I never saw Qts out of the ordinary hifi range.
I found specs in the Parts Express Q/A for GRS 69AS-4 6"x9".
This is 4Ω though (vs 8Ω for the Delco I'm waiting for).
Re: 3.646 Ω
Fs: 71.33 Hz
Qts: 1.401
Qes: 1.851
Qms: 5.768
Le (1kHz): .506 mH
Mms: 18.73 g
Vas: .6044
SPL: 87.15 dB
This is 4Ω though (vs 8Ω for the Delco I'm waiting for).
Re: 3.646 Ω
Fs: 71.33 Hz
Qts: 1.401
Qes: 1.851
Qms: 5.768
Le (1kHz): .506 mH
Mms: 18.73 g
Vas: .6044
SPL: 87.15 dB
Did some measurements for one driver. I had to disconnect the tweeter. Attaching impedance curves of the driver with and with no tweeter.
fs 93.2 Hz
Qms 9.947
Qes 3.496
Qts 2.587
Fts 36.0
Mms 10.00 g
Cms 0.292 mm/N
Rms 0.589 kg/s
Vas 4.71 litres
Bl 3.599 Tm
Eta 0.11 %
Lp (1W/1m) 82.43 dB
Dd 11.65 cm
Sd 106.7 cm^2 --- used 42 sq inch from a table, I didn't measure it.
Impedance of 3 drivers with tweeter.
Impedance of remaining driver, tweeter disconnected.
I did measure from 5cm with and without tweeter, without a box and speaker on top of a table so I guess it's not very useful.
fs 93.2 Hz
Qms 9.947
Qes 3.496
Qts 2.587
Fts 36.0
Mms 10.00 g
Cms 0.292 mm/N
Rms 0.589 kg/s
Vas 4.71 litres
Bl 3.599 Tm
Eta 0.11 %
Lp (1W/1m) 82.43 dB
Dd 11.65 cm
Sd 106.7 cm^2 --- used 42 sq inch from a table, I didn't measure it.
Impedance of 3 drivers with tweeter.
Impedance of remaining driver, tweeter disconnected.
I did measure from 5cm with and without tweeter, without a box and speaker on top of a table so I guess it's not very useful.
Attachments
If you are referring to subwoofer drivers designed to work in subwoofer enclosures, then yes-ish, sort of.
But every car loudspeaker designed to be mounted in doors or behind the rear seats has Qts equal or greater than 1. And I mean every loudspeaker, including 6x9".
I measured in the living room with more SPL, from 1m, and the shape was similar. But the speaker is on top of the table so lots of cancellations. Not really useful. Also interesting that the peak is not far from the estimated Fs.
I'm leaving them a few hours playing 100Hz, 2W to 4Ω (parallel). To see if something changes with the parameters. I hope it's not too much.
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That is absolutely not my experience.
The only high Qts car loudspeakers I ran across in my time were the Hart Professional series. And they weren't incredibly high.
Perhaps there were brands that didn't specify their parameters with high values, but the ones that did specify them weren't necessarily exceptional and left me no reason to assume that all of the other speakers on the market were way different.
Brands like Rockford Fosgate, HiFonics, MTX, Pyle, JL Audio, etc all specified parameters for midrange door and rear deck speakers, from 3" up. They were all typical HiFi driver parameters.
Perhaps that has changed over the years.
From your list of "low Qts" drivers, I measured MTX and Rockford Fosgate - sorry, their Qts parameters were high, about 1.
How many different models did you measure? And did the manufacturer publish parameters that were vastly different?