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Interior and Accessories› Sound Deadening Material

BavSound

Stage One Speaker Upgrade Kit

$849.00 $772.59 Save $76.41

SKU: BSD.S1.E90.THF-Kit

In Stock
In Stock
Ships by Sep 12
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Overview

The BavSound Stage One speaker upgrade kit is designed for BMW E90 Sedan models equipped with the Premium Top Hi-Fi system. It utilizes woven fiberglass cones, butyl rubber surrounds, and silk composite tweeters for distortion-free audio.
Show original supplier description
The BavSound Stage One speaker upgrade kit provides a clear path to enhancing your BMW E90 Sedan's audio system. Constructed with advanced audio technology, the speakers feature woven fiberglass cones, butyl rubber surrounds, and silk composite tweeters. This combination ensures distortion-free performance even at higher volumes, delivering accurate, natural, and beautiful sound. This kit is specifically for BMW E90 Sedan models that came with the Premium Top Hi-Fi system (S677A Professional DSP or S688A Harmon Kardon). It is important to note that the standard kit will not fit correctly with Harmon Kardon systems, and Bavsound's HK-specific Stage One kit is required for those configurations. The product is made in the United States.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandBavSound
Part NumberBSD.S1.E90.THF-Kit
CategoryInterior and Accessories

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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