Short answer: the Pioneer SP-BS22-LR in Philharmonic AAM form, though neither ranks well in its class. The Fluance Signature HFS is the more flexible install, with a front-facing port and pre-installed wall-mount brackets for surround or height duty, but its spinorama shows serious midrange flaws: both the direct sound and the directivity are compromised. The AAM mod by Dennis Murphy shows only some directivity error near the crossover by comparison. Both are rated below 3.0/5 among the 90 bookshelf speakers; for better sound, the Neumi BS5 ranks #22 at $139.99.
Buy the Fluance Signature HFS new; the Pioneer SP-BS22-LR (Philharmonic AAM Mod) is no longer sold new, so it only makes sense as a used find.
Want more options? Browse the full Passive Home rankings.
Specifications Side By Side
| Pioneer SP-BS22-LR (Philharmonic AAM Mod) | Fluance Signature HFS | |
|---|---|---|
| Price | $168 per pair Discontinued | $199.99 per pair |
| Ranked | #63 of 90 in Medium Size Bookshelf Speakers | #79 of 90 in Medium Size Bookshelf Speakers |
| Bass Extension (-3dB) | 78Hz (measured, Audio Science Review) | 78Hz (measured, Audio Science Review) |
| Bass Extension (-10dB) | 60Hz (measured, Audio Science Review) | 60Hz (measured, Audio Science Review) |
| Drivers | 1x 4” curvilinear-cone woofer (stock Pioneer), 1x Peerless BC25TG15 1” silk dome tweeter (replacement) | 1” neodymium silk dome tweeter (ferrofluid cooled), 5” glass-fiber-treated woofer (butyl rubber surround) |
| Weight | 9 lbs (4.1 kg) | 9.7 lbs (4.4 kg) each |
| Sensitivity | 83dB (2.83V/1m, measured by Audio Science Review) | 86dB (2.83V/1m, measured, Audio Science Review) |
| Impedance | 8 ohms nominal (approx. 5 ohms minimum, measured by Audio Science Review) | 8 ohms |
| Crossover Frequency | 3000Hz | - |
| Dimensions | 12.6”H x 7.1”W x 8.5”D (320.0 x 180.0 x 215.0 mm) | 12.8H x 7.87W x 8.22D in |
| Woofer Cabinet | ported, rear | ported, front |
| Spinorama Preference Score | 5.07 | 2.92 (spinorama.org) |
| Spinorama Preference Score with Perfect Sub | 7.82 | 5.53 (spinorama.org) |
| DIY Kit | Yes | No |
| Power Handling | - | 30-120W recommended |
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Prices on this page were last checked October 2, 2026 at 10:18 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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The Two Speakers In Full
Pioneer SP-BS22-LR (Philharmonic AAM Mod): $168 per pair Discontinued eBay
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. Measured bass extension of 78Hz (-3dB), with a measured sensitivity of 83dB.
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 →
| Bass Extension (-10dB) | 60Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 78Hz (measured, Audio Science Review) |
| Crossover Frequency | 3000Hz |
| DIY Kit | Yes |
| 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) |
| Spinorama Preference Score | 5.07 |
| Spinorama Preference Score with Perfect Sub | 7.82 |
| Weight | 9 lbs (4.1 kg) |
| Woofer Cabinet | ported, rear |
- Links
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Fluance Signature HFS: $199.99 per pair Amazon eBay
Pros: Front-facing port and pre-installed wall-mount brackets make it flexible for bookshelf or surround/height duty. Distortion in the low end is well controlled per the measurements, and the glossy front baffle adds a touch of style well beyond the budget price. Measured bass extension of 78Hz (-3dB), with a measured sensitivity of 86dB.
Cons: CEA2034 spinorama shows serious flaws in the midrange: both the direct sound and the directivity are compromised, a combination the reviewer flagged as poor for controlled listening tests. Multiple attempted EQ fixes “could not rescue” the sound, and the reviewer said the result was “close” to the lowest possible rating. Online reviews seeded by the company were positive; the reviewer’s measured and subjective experience was not.
Full Fluance Signature HFS review and specifications →
| Bass Extension (-10dB) | 60Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 78Hz (measured, Audio Science Review) |
| DIY Kit | No |
| Dimensions | 12.8H x 7.87W x 8.22D in |
| Drivers | 1” neodymium silk dome tweeter (ferrofluid cooled), 5” glass-fiber-treated woofer (butyl rubber surround) |
| Impedance | 8 ohms |
| Power Handling | 30-120W recommended |
| Sensitivity | 86dB (2.83V/1m, measured, Audio Science Review) |
| Spinorama Preference Score | 2.92 (spinorama.org) |
| Spinorama Preference Score with Perfect Sub | 5.53 (spinorama.org) |
| Weight | 9.7 lbs (4.4 kg) each |
| Woofer Cabinet | ported, front |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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