MB Quart - Formula Series 4" x 6" 2-Way Car Speakers with Polypropylene Cones (Pair) - Black
Price range: $39.95–59.99
Brand: MB Quart
Category: Audio
A pair of MB Quart headphones featuring 4" x 6" drivers, 55 Hz–20 kHz frequency response, and 4Ω impedance.
PQS: 100 (computed 2026-04-28 07:03)
GTIN-14: 00806576228349
Key specs
A human-friendly subset of populated specs
Driver
4" x 6"
Frequency response
55 hertz - 20 kilohertz
Impedance (ohms)
4
Wireless (BT/WiFi)
No
Offers
| Retailer | SKU | Price | Stock | Offer | Last seen |
|---|---|---|---|---|---|
| Best Buy | 6507876 | 59.99 USD | In stock | View offer → | 2026-04-28 02:44 |
| Newegg | 9SIA34AEM76562 | 39.95 USD | In stock | View offer → | 2026-04-28 02:17 |
Recent price history (50)
Show price log (50 entries)
| Retailer | Price | Stock | Seen at |
|---|---|---|---|
| bestbuy | 59.99 USD | In stock | 2026-04-28 02:44 |
| newegg | 39.95 USD | In stock | 2026-04-28 02:17 |
| newegg | 39.95 USD | In stock | 2026-04-27 02:16 |
| bestbuy | 59.99 USD | In stock | 2026-04-26 02:44 |
| newegg | 39.95 USD | In stock | 2026-04-26 02:16 |
| bestbuy | 59.99 USD | In stock | 2026-04-25 02:41 |
| newegg | 39.95 USD | In stock | 2026-04-25 02:17 |
| bestbuy | 59.99 USD | In stock | 2026-04-24 02:33 |
| newegg | 39.95 USD | In stock | 2026-04-24 02:23 |
| bestbuy | 59.99 USD | In stock | 2026-04-23 02:36 |
| newegg | 39.95 USD | In stock | 2026-04-23 02:13 |
| bestbuy | 59.99 USD | In stock | 2026-04-22 02:38 |
| newegg | 39.95 USD | In stock | 2026-04-22 02:14 |
| bestbuy | 59.99 USD | In stock | 2026-04-21 02:40 |
| newegg | 39.95 USD | In stock | 2026-04-21 02:11 |
| bestbuy | 59.99 USD | In stock | 2026-04-20 02:45 |
| newegg | 39.95 USD | In stock | 2026-04-20 02:20 |
| bestbuy | 59.99 USD | In stock | 2026-04-19 02:37 |
| newegg | 39.95 USD | In stock | 2026-04-19 02:24 |
| bestbuy | 59.99 USD | In stock | 2026-04-18 02:40 |
| newegg | 39.95 USD | In stock | 2026-04-18 02:23 |
| bestbuy | 59.99 USD | In stock | 2026-04-17 02:45 |
| newegg | 34.95 USD | In stock | 2026-04-17 02:24 |
| newegg | 34.95 USD | In stock | 2026-04-16 13:28 |
| bestbuy | 59.99 USD | In stock | 2026-04-16 02:41 |
| newegg | 34.95 USD | In stock | 2026-04-16 02:15 |
| bestbuy | 59.99 USD | In stock | 2026-04-15 02:42 |
| newegg | 34.95 USD | In stock | 2026-04-15 02:20 |
| bestbuy | 59.99 USD | In stock | 2026-04-14 02:34 |
| newegg | 34.95 USD | In stock | 2026-04-14 02:14 |
| bestbuy | 59.99 USD | In stock | 2026-04-13 02:36 |
| newegg | 34.95 USD | In stock | 2026-04-13 02:23 |
| bestbuy | 59.99 USD | In stock | 2026-04-12 02:44 |
| newegg | 34.95 USD | In stock | 2026-04-12 02:23 |
| bestbuy | 59.99 USD | In stock | 2026-04-11 02:42 |
| newegg | 34.95 USD | In stock | 2026-04-11 02:18 |
| bestbuy | 59.99 USD | In stock | 2026-04-10 02:39 |
| newegg | 34.95 USD | In stock | 2026-04-10 02:25 |
| bestbuy | 59.99 USD | In stock | 2026-04-09 02:43 |
| newegg | 34.95 USD | In stock | 2026-04-09 02:12 |
| bestbuy | 59.99 USD | In stock | 2026-04-08 02:39 |
| newegg | 34.95 USD | In stock | 2026-04-08 02:24 |
| newegg | 34.95 USD | In stock | 2026-04-07 02:17 |
| newegg | 34.95 USD | In stock | 2026-04-06 02:20 |
| bestbuy | 59.99 USD | In stock | 2026-04-05 02:42 |
| newegg | 34.95 USD | In stock | 2026-04-05 02:14 |
| bestbuy | 59.99 USD | In stock | 2026-04-04 02:41 |
| newegg | 34.95 USD | In stock | 2026-04-04 02:11 |
| bestbuy | 59.99 USD | In stock | 2026-04-03 02:38 |
| newegg | 34.95 USD | In stock | 2026-04-03 02:19 |
Full specs
Show full spec table
| Driver | 4" x 6" |
|---|---|
| Frequency response | 55 hertz - 20 kilohertz |
| Impedance (ohms) | 4 |
| Wireless (BT/WiFi) | No |
| Reconciled at | 2026-03-06 10:56 |
Canonical JSON (expand)
{
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"title": "MB Quart - Formula Series 4\" x 6\" 2-Way Car Speakers with Polypropylene Cones (Pair) - Black",
"seo_title": "MB Quart FKB146"
},
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"audio": {
"driver": "4\" x 6\"",
"wireless": "No",
"impedance_ohms": 4,
"speakers_count": 4,
"frequency_response": "55 hertz - 20 kilohertz"
},
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"build": {},
"extra": {},
"model": "FKB146",
"ports": {},
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"category": "audio",
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"physical": {
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"weight_kg": 0.88,
"dimensions_in": "3 x 7.25 x 10.25 in"
},
"thermals": {},
"warranty": {
"labor": "1 Year",
"parts": "1 Year"
},
"wearable": {},
"appliance": {},
"networking": {},
"peripheral": {},
"smart_home": {},
"certifications": {},
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}
Related products
Simple similarity over extracted specs (publish_set only)
Debug data (expand)
| Raw title | MB Quart - Formula Series 4" x 6" 2-Way Car Speakers with Polypropylene Cones (Pair) - Black |
|---|---|
| Raw brand | MB Quart |
| Raw category | Best Buy > Car Electronics & GPS > Car Audio > Car Speakers |
Canonical highlights (populated fields only)
| core.title | MB Quart - Formula Series 4" x 6" 2-Way Car Speakers with Polypropylene Cones (Pair) - Black |
|---|---|
| core.seo_title | MB Quart FKB146 |
| audio.driver | 4" x 6" |
| audio.wireless | No |
| audio.impedance_ohms | 4 |
| audio.speakers_count | 4 |
| audio.frequency_response | 55 hertz - 20 kilohertz |
| brand | MB Quart |
| model | FKB146 |
| gtin14 | 00806576228349 |
| images[0] | https://pisces.bbystatic.com/prescaled/500/500/image2/BestBuy_US/images/products/6507/6507876_sd.jpg |
| category | audio |
| physical.depth_in | 10.25 |
| physical.width_in | 7.25 |
| physical.height_in | 3.0 |
| physical.weight_kg | 0.88 |
| physical.dimensions_in | 3 x 7.25 x 10.25 in |
| warranty.labor | 1 Year |
| warranty.parts | 1 Year |
| schema_version | 1 |
BestBuy raw specs (pretty)
Expand BestBuy raw JSON
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"upc": "806576228349",
"url": "https://api.bestbuy.com/click/-/6507876/pdp",
"name": "MB Quart - Formula Series 4\" x 6\" 2-Way Car Speakers with Polypropylene Cones (Pair) - Black",
"image": "https://pisces.bbystatic.com/prescaled/500/500/image2/BestBuy_US/images/products/6507/6507876_sd.jpg",
"details": [
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"value": "MB Quart",
"values": [
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{
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{
"name": "Product Name",
"value": "Formula Series 4\" x 6\" 2-Way Car Speakers with Polypropylene Cones (Pair)",
"values": [
"Formula Series 4\" x 6\" 2-Way Car Speakers with Polypropylene Cones (Pair)"
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},
{
"name": "Color",
"value": "Black",
"values": [
"Black"
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},
{
"name": "RMS Power",
"value": "45 watts",
"values": [
"45 watts"
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},
{
"name": "Peak Power Handling",
"value": "90 watts",
"values": [
"90 watts"
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},
{
"name": "Minimum Frequency Response",
"value": "55 hertz",
"values": [
"55 hertz"
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},
{
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"value": "20 kilohertz",
"values": [
"20 kilohertz"
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{
"name": "Impedance",
"value": "4 ohms",
"values": [
"4 ohms"
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{
"name": "Sensitivity",
"value": "88 decibels",
"values": [
"88 decibels"
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},
{
"name": "Integrated Crossover",
"value": "Yes",
"values": [
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{
"name": "Speaker Size",
"value": "4\" x 6\"",
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{
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"value": "2-way",
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{
"name": "Tweeter Composition",
"value": "Aluminum",
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{
"name": "Mount Depth",
"value": "3 inches",
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"value": "3 inches",
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"value": "7.25 inches",
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"value": "10.25 inches",
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{
"name": "Product Weight",
"value": "1.95 pounds",
"values": [
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{
"name": "Number Of Speakers",
"value": "2",
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"value": "1 year",
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"value": "1 year",
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"features": [
{
"feature": "Handles up to 90W maximum power\nProvides rich sound."
},
{
"feature": "55Hz - 20kHz frequency response\nAccurately produces a wide range of sound."
},
{
"feature": "Lightweight thermal-formed polypropylene cones\nDeliver impactful bass with minimal cone flex."
},
{
"feature": "1\" aluminum dome tweeter\nOffers natural-sounding high-frequency response, while the WideSphere technology allows the tweeter to develop a wider listening area for off-axis listening."
},
{
"feature": "4-ohm impedance\nConducts power evenly to keep the speaker at the appropriate level."
},
{
"feature": "5.5\" x 3.46\" cutout dimensions\nThe shallow basket depth makes installation easier."
}
],
"condition": "New",
"salePrice": 59.99,
"categoryPath": [
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"name": "Car Speakers"
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],
"manufacturer": "MB Quart",
"regularPrice": 59.99,
"shippingCost": "",
"longDescription": "Rock out on the road with these MB Quart Formula 4 x 6-inch car speakers. The aluminum dome tweeters deliver clear, detailed sound, and the lightweight cones enhance your experience with fast midrange responses. These MB Quart Formula 4 x 6-inch car speakers have integrated internal crossovers that ensure smooth frequency transitions.",
"shortDescription": null,
"onlineAvailability": true,
"inStoreAvailability": true
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Newegg raw specs
raw_specs_text (pretty) — expand
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