Background:
I felt like a part of me was missing for the past couple of years when the sub on my Altec Lansing 2100 started making "pops of death". The butyl-rubber surrounds deteriorated and shredded from age and wear. I was super busy and EQed out the damage the best I could, but the satellite speakers simply couldn't give the sound I was missing. The sub volume was almost all the way down after all. It was shrill with no punch and began to distort at louder volumes. The satellites did the best they could, but with COVID grounding us all, I resolved to fix it.
Installation:
The hardest part of this repair was removal of the 2100s front grill. I had to break glued-in stand-offs to gain access. I will probably drill and install screws for easy grill access in the future. I snipped and stripped the existing wire and added extra length for my sanity in case I need to work on it again. The speakers are wired directly together, so I made sure to mind the polarity. I didn't want the two speakers out of phase and canceling each other. Some strategically placed heat shrink and a couple quick solder joints later, I was on to testing at high volume. :)
Testing and EQ:
The results were breathtaking. I was immediately impressed with how accurate they are. I started with a flat EQ and tweaked it over the course of 30 minutes and the sound was just as I remembered day one... if not punchier. In my pics, there are before and after EQ curves, both high-mid scoops. The before is extreme and the after is much flatter with a pronounced notch at 110 Hz. That is to say that I had to turn down the punchiest frequency where ~110 Hz is very dominant in this tuned port box with these speakers.
Caveats:
Please keep in mind when looking at the EQ curves: They do not reflect the full frequency response of these speakers. This sub box has a well built cross-over so above a certain frequency (~350 Hz (?)) the curve reflects the satellites. The tuned port also has effects on the low end response. With a well built enclosure, these sound great.
TL;DR:
These are well-matched drop-in replacements for original Altec Lansing A7381 8 ohm 4-inch woofers. These are punchier than the stock speakers. I'm extremely happy with the purchase and thank you, Grok, for the great price/quality of these speakers. These totally met my needs in this application.
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Product Description
DROK 4 Inches 8 Ohm Full-Range Stereo Audio Speaker
Parameters
Outer diameter: 116mm;
Height: 69mm;
Hole diameter: 93mm;
Rated power: 40W;
Effective frequency: 65Hz-6KHz;
Impedance: 8ohm;
Magnet diameter: 78mm.
Design Details
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Thickened Rubber CoilWhich is quite elastic and make this speaker display a thick bass. With the high sensitivity of 87dB, it can be easily activated by 25-40W to start with a rare HiFi level bass unit. |
Anti-magnetic DesignWith the dual magnetic anti-magnetic design, this subwoofer will bring you more comfortable sound hearing. |
Paper Cone with Bump DotThe back-loose paper cone increases the damping to absorb multiple harmonics. The larger the rough contact area of the concave-convex cone surface, the greater the energy generated, the better the density, and the more shocking bass. |
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| DROK 4" 8Ω Round Speaker *1 | DROK 4" 4Ω Round Speaker *1 | DROK 4.5" 4Ω Square Speaker *1 | DROK 3" 8Ω Square Speaker *1 | DROK 4" 8Ω Round Speaker *2 | DROK 4.5" 4Ω Square Speaker *2 | |
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| Customer Reviews |
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| Outer Diameter | 116mm | 116mm | 120mm | 89mm | 116mm | 120mm |
| Height | 69mm | 69mm | 60mm | 55mm | 69mm | 60mm |
| Rated Power | 40w | 40w | 40w | 25w | 40w | 40w |
| Effective Frequency | 65Hz-6KHz | 65Hz-6KHz | 66Hz-2KHz | 90Hz-5KHz | 65Hz-6KHz | 66Hz-2KHz |
| Impedance | 8ohm | 4ohm | 4ohm | 8ohm | 8ohm | 4ohm |
| Magnet Diameter | 78mm | 78mm | 80mm | 65mm | 78mm | 80mm |
| Sensitivity | 87dB | 87dB | 87dB | 87dB | 87dB | 87dB |
Videos
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Videos for this product
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Customer Review: See u again Pioneer Andrew
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Reviews with images
Altec Lansing 2100: My baby is back!!
Background:I felt like a part of me was missing for the past couple of years when the sub on my Altec Lansing 2100 started making "pops of death". The butyl-rubber surrounds deteriorated and shredded from age and wear. I was super busy and EQed out the damage the best I could, but the satellite speakers simply couldn't give the sound I was missing. The sub volume was almost all the way down after all. It was shrill with no punch and began to distort at louder volumes. The satellites did the best they could, but with COVID grounding us all, I resolved to fix it.Installation:The hardest part of this repair was removal of the 2100s front grill. I had to break glued-in stand-offs to gain access. I will probably drill and install screws for easy grill access in the future. I snipped and stripped the existing wire and added extra length for my sanity in case I need to work on it again. The speakers are wired directly together, so I made sure to mind the polarity. I didn't want the two speakers out of phase and canceling each other. Some strategically placed heat shrink and a couple quick solder joints later, I was on to testing at high volume. :)Testing and EQ:The results were breathtaking. I was immediately impressed with how accurate they are. I started with a flat EQ and tweaked it over the course of 30 minutes and the sound was just as I remembered day one... if not punchier. In my pics, there are before and after EQ curves, both high-mid scoops. The before is extreme and the after is much flatter with a pronounced notch at 110 Hz. That is to say that I had to turn down the punchiest frequency where ~110 Hz is very dominant in this tuned port box with these speakers.Caveats:Please keep in mind when looking at the EQ curves: They do not reflect the full frequency response of these speakers. This sub box has a well built cross-over so above a certain frequency (~350 Hz (?)) the curve reflects the satellites. The tuned port also has effects on the low end response. With a well built enclosure, these sound great.TL;DR:These are well-matched drop-in replacements for original Altec Lansing A7381 8 ohm 4-inch woofers. These are punchier than the stock speakers. I'm extremely happy with the purchase and thank you, Grok, for the great price/quality of these speakers. These totally met my needs in this application.
Top reviews from the United States
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Reviewed in the United States on July 12, 2020
Background:
I felt like a part of me was missing for the past couple of years when the sub on my Altec Lansing 2100 started making "pops of death". The butyl-rubber surrounds deteriorated and shredded from age and wear. I was super busy and EQed out the damage the best I could, but the satellite speakers simply couldn't give the sound I was missing. The sub volume was almost all the way down after all. It was shrill with no punch and began to distort at louder volumes. The satellites did the best they could, but with COVID grounding us all, I resolved to fix it.
Installation:
The hardest part of this repair was removal of the 2100s front grill. I had to break glued-in stand-offs to gain access. I will probably drill and install screws for easy grill access in the future. I snipped and stripped the existing wire and added extra length for my sanity in case I need to work on it again. The speakers are wired directly together, so I made sure to mind the polarity. I didn't want the two speakers out of phase and canceling each other. Some strategically placed heat shrink and a couple quick solder joints later, I was on to testing at high volume. :)
Testing and EQ:
The results were breathtaking. I was immediately impressed with how accurate they are. I started with a flat EQ and tweaked it over the course of 30 minutes and the sound was just as I remembered day one... if not punchier. In my pics, there are before and after EQ curves, both high-mid scoops. The before is extreme and the after is much flatter with a pronounced notch at 110 Hz. That is to say that I had to turn down the punchiest frequency where ~110 Hz is very dominant in this tuned port box with these speakers.
Caveats:
Please keep in mind when looking at the EQ curves: They do not reflect the full frequency response of these speakers. This sub box has a well built cross-over so above a certain frequency (~350 Hz (?)) the curve reflects the satellites. The tuned port also has effects on the low end response. With a well built enclosure, these sound great.
TL;DR:
These are well-matched drop-in replacements for original Altec Lansing A7381 8 ohm 4-inch woofers. These are punchier than the stock speakers. I'm extremely happy with the purchase and thank you, Grok, for the great price/quality of these speakers. These totally met my needs in this application.
I felt like a part of me was missing for the past couple of years when the sub on my Altec Lansing 2100 started making "pops of death". The butyl-rubber surrounds deteriorated and shredded from age and wear. I was super busy and EQed out the damage the best I could, but the satellite speakers simply couldn't give the sound I was missing. The sub volume was almost all the way down after all. It was shrill with no punch and began to distort at louder volumes. The satellites did the best they could, but with COVID grounding us all, I resolved to fix it.
Installation:
The hardest part of this repair was removal of the 2100s front grill. I had to break glued-in stand-offs to gain access. I will probably drill and install screws for easy grill access in the future. I snipped and stripped the existing wire and added extra length for my sanity in case I need to work on it again. The speakers are wired directly together, so I made sure to mind the polarity. I didn't want the two speakers out of phase and canceling each other. Some strategically placed heat shrink and a couple quick solder joints later, I was on to testing at high volume. :)
Testing and EQ:
The results were breathtaking. I was immediately impressed with how accurate they are. I started with a flat EQ and tweaked it over the course of 30 minutes and the sound was just as I remembered day one... if not punchier. In my pics, there are before and after EQ curves, both high-mid scoops. The before is extreme and the after is much flatter with a pronounced notch at 110 Hz. That is to say that I had to turn down the punchiest frequency where ~110 Hz is very dominant in this tuned port box with these speakers.
Caveats:
Please keep in mind when looking at the EQ curves: They do not reflect the full frequency response of these speakers. This sub box has a well built cross-over so above a certain frequency (~350 Hz (?)) the curve reflects the satellites. The tuned port also has effects on the low end response. With a well built enclosure, these sound great.
TL;DR:
These are well-matched drop-in replacements for original Altec Lansing A7381 8 ohm 4-inch woofers. These are punchier than the stock speakers. I'm extremely happy with the purchase and thank you, Grok, for the great price/quality of these speakers. These totally met my needs in this application.
Images in this review
Reviewed in the United States on March 8, 2021
Reviewed in the United States on July 27, 2021
For $18 you can not go wrong with this woofer. Wish I could fit two on the set up I made for work but their wasn’t enough space and amp couldn’t support it. It still sounds great for a sealed enclosure I’d definitely buy again
Edit: 8/23/22 so after using my setup for awhile which I constantly play loud everyday it did sound clear and great but I recently started to notice distortion on this woofer when the bass plays. It could’ve been my eq setup that could’ve cause premature failure but still not bad for the money might order a replacement.
Edit: 8/23/22 so after using my setup for awhile which I constantly play loud everyday it did sound clear and great but I recently started to notice distortion on this woofer when the bass plays. It could’ve been my eq setup that could’ve cause premature failure but still not bad for the money might order a replacement.
Images in this review
Reviewed in the United States on March 27, 2017
Reviewed in the United States on February 13, 2019
While the speakers seems to be of decent quality based on price. The mounting flange seems really thin an weak, and it has a lip that prevents flush mounting without adding a foam spacer to ensure air tightness and to prevent from bending and warping the mounting flange.
Images in this review
Reviewed in the United States on January 13, 2020
Top reviews from other countries
David pope
One is not enough. 4 are great! Thank you DROK
Reviewed in Australia on December 6, 2019
David pope
Reviewed in Australia on December 6, 2019
Received 3 more speakers and now need a better subwoofer.
Images in this review
