Short answer: the Pioneer SP-BS22-LR (Philharmonic AAM Mod) for better sound quality, the Parts Express Copperhead Desktop Kit for the lower price. The Pioneer SP-BS22-LR (Philharmonic AAM Mod) ranks #24 of 34 bookshelf speakers at $168. The Parts Express Copperhead Desktop Kit ranks #26 at $119.98, $48.02 cheaper.
What the Pioneer SP-BS22-LR (Philharmonic AAM Mod) offers: This is Dennis Murphy’s “Affordable Accuracy Monitor” (AAM) mod of the discontinued, budget Pioneer SP-BS22-LR: the stock tweeter is swapped for a Peerless BC25TG15 dome and a redesigned 3rd-order crossover is built to match it to the stock 4” woofer. Watch for: Some directivity error appears near the crossover frequency.
What the Parts Express Copperhead Desktop Kit offers: Inexpensive, beginner-friendly CNC flat-pack kit with a compact 8 x 5-inch desktop footprint and only one 3.5-inch full-range driver per channel. Watch for: Despite the ‘full-range’ label, output rolls off around 120-150Hz and a subwoofer with an unusually high 100-200Hz crossover is effectively mandatory.
Buy the Pioneer SP-BS22-LR (Philharmonic AAM Mod) if sound quality matters more than the price. Buy the Parts Express Copperhead Desktop Kit if the price matters more than sound quality.
If sound quality matters at all to you, skip the Parts Express Copperhead Desktop Kit. It ranks near the bottom of the 34 bookshelf speakers, so look higher up the list instead.
Specifications Side By Side
| Pioneer SP-BS22-LR (Philharmonic AAM Mod) | Parts Express Copperhead Desktop Kit | |
|---|---|---|
| Price | $168 | $119.98 |
| Ranked | #24 of 34 in Medium Size Bookshelf Speakers | #26 of 34 in Medium Size Bookshelf Speakers |
| Drivers | 1x 4" curvilinear-cone woofer (stock Pioneer), 1x Peerless BC25TG15 1" silk dome tweeter (replacement) | 3.5" Dayton Audio PS95-8 full-range driver |
| Weight | 9 lbs / 4.1 kg | - |
| Sensitivity | 83dB (2.83V/1m, measured by Audio Science Review) | 81dB @ 1W/1m (measured by Erin’s Audio Corner and manufacturer specified) |
| Impedance | 8 ohms nominal (approx. 5 ohms minimum, measured by Audio Science Review) | 8 ohms (manufacturer specified) |
| Crossover Frequency | 3000Hz | - |
| Dimensions | 12.6"H x 7.1"W x 8.5"D (320.0 x 180.0 x 215.0 mm) | 8"H x 5"W x 6.5"D (203 x 127 x 165 mm) |
| Woofer Cabinet | ported, rear | ported, bottom |
| Frequency Response | - | 120Hz-20kHz +/-3dB (manufacturer specified) |
| Power Handling | - | 10W RMS / 20W maximum; 25W RMS with 50Hz high-pass |
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The Two Speakers In Full
Pioneer SP-BS22-LR (Philharmonic AAM Mod): $168
Pros: This is Dennis Murphy’s “Affordable Accuracy Monitor” (AAM) mod of the discontinued, budget Pioneer SP-BS22-LR: the stock tweeter is swapped for a Peerless BC25TG15 dome and a redesigned 3rd-order crossover is built to match it to the stock 4” woofer. CEA2034 spinorama shows only small variations from a flat on-axis response with some directivity error near the crossover, a marked improvement over the unmodified Pioneer, which the reviewer notes shows much more variation from flat. Distortion at 86dB SPL/1m is reasonably controlled above 200Hz, and tweeter distortion barely rises even at 96dB SPL/1m.
Cons: Some directivity error appears near the crossover frequency. Distortion climbs in the woofer’s range (below 200Hz) at both 86dB and 96dB SPL/1m. Minimum impedance dips to about 5 ohms with a couple of resonance peaks. This is a DIY project, not a finished retail product: Murphy sold ~$168 pre-built pairs for a while but no longer does, so it now requires sourcing a used/discontinued Pioneer SP-BS22-LR pair plus building the crossover and swapping the tweeter yourself. The mod itself is public domain, but there is no current turnkey way to buy this speaker.
Full Pioneer SP-BS22-LR (Philharmonic AAM Mod) review and specifications →
| Crossover Frequency | 3000Hz |
|---|---|
| Dimensions | 12.6"H x 7.1"W x 8.5"D (320.0 x 180.0 x 215.0 mm) |
| Drivers | 1x 4" curvilinear-cone woofer (stock Pioneer), 1x Peerless BC25TG15 1" silk dome tweeter (replacement) |
| Impedance | 8 ohms nominal (approx. 5 ohms minimum, measured by Audio Science Review) |
| Sensitivity | 83dB (2.83V/1m, measured by Audio Science Review) |
| Weight | 9 lbs / 4.1 kg |
| Woofer Cabinet | ported, rear |
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Parts Express Copperhead Desktop Kit: $119.98 Parts Express
Pros: Inexpensive, beginner-friendly CNC flat-pack kit with a compact 8 x 5-inch desktop footprint and only one 3.5-inch full-range driver per channel. The point-source layout avoids a conventional woofer/tweeter crossover and, when listened to around 20 degrees above the driver as intended, can produce precise near-field imaging. Erin measured roughly 81dB sensitivity, consistent with Parts Express’s specification. The included baffle-step network improves lower-midrange balance, while the optional series inductor reduces the driver’s rising top end; Erin recommends retaining it. Several remaining narrow peaks can be corrected with desktop software EQ. Bottom porting conserves desk space, and unfinished MDF invites custom finishing.
Cons: Despite the ‘full-range’ label, output rolls off around 120-150Hz and a subwoofer with an unusually high 100-200Hz crossover is effectively mandatory. Native response has resonances near roughly 2.1kHz and 8kHz plus a broad 14-20kHz rise of 5-8dB, so it is not smooth without the supplied network and additional EQ. Distortion already exceeds 3% in places at 86dB/1m and becomes extreme at 96dB. Erin’s multitone test approached -10dB distortion (roughly 30%) full-range at the highest level, accompanied by 3-4dB compression; even a 200Hz high-pass leaves roughly 3-5% distortion and 2-3dB compression. The angled cabinet demands a specific near-field ear height, and its very low sensitivity plus 10W RMS power rating leave almost no clean-output headroom for room listening.
Full Parts Express Copperhead Desktop Kit review and specifications →
| Dimensions | 8"H x 5"W x 6.5"D (203 x 127 x 165 mm) |
|---|---|
| Drivers | 3.5" Dayton Audio PS95-8 full-range driver |
| Frequency Response | 120Hz-20kHz +/-3dB (manufacturer specified) |
| Impedance | 8 ohms (manufacturer specified) |
| Power Handling | 10W RMS / 20W maximum; 25W RMS with 50Hz high-pass |
| Sensitivity | 81dB @ 1W/1m (measured by Erin's Audio Corner and manufacturer specified) |
| Woofer Cabinet | ported, bottom |
As an eBay Partner, we may be compensated if you make a purchase.
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons