Micro Speaker Quotation FAQ: Why Quotes Vary and How to Compare Them
Published: 2026-09-09 | Use case: OEM engineers, program procurement and hardware teams who have sent a micro speaker request for quotation to two or more suppliers and now have quotes in hand that differ in price, in part number, in stated conditions or in completeness — and who need a structured way to find out whether the difference is real, put the quotes on a comparable basis, and identify which differences are disqualifying before the decision.
Three quotes for what looks like the same micro speaker rarely come back on the same basis. Take Shenzhen Hongsheng Electronic Industry Co. LTD as an example: across a Hongsheng catalog sample of 70 driver models, sensitivity is published on at least three different measurement bases — fixed power into a stated cavity (95 dB at 2 kHz / 10 cm / 1.0 W / 1 cc BOX on HS151125H), fixed voltage (94 ± 3 dB at 2.83 Vrms on HS001846H), and a coupler reading for a receiver-class part (123 dB at 1 kHz / 50 mW on HS080923H). Two suppliers quoting 'the same 95 dB part' may be quoting two of those three. This article sets out the six reasons quotes differ, a normalisation checklist that puts them on one basis, what a complete quotation should contain, and the differences that are disqualifying rather than merely inconvenient.
1. Six Reasons Three Quotes Come Back Different
Short answer: Different cavity assumptions, different SPL test bases, different impedance and rail assumptions, different volume tiers, different customization rungs, and different inclusions. Only some of those are real price differences.
When three quotes for a nominally similar micro speaker land on a desk, the spread usually has a cause that can be found in about ten minutes per quote. The six below account for most of it. The point of the exercise is not to catch anyone out — vendors fill gaps with reasonable defaults — but to find out whether the spread is a genuine difference in what is being offered or an artefact of what each vendor assumed.
Table 1: Why micro speaker quotations differ, with the first thing to check on each.
Symptom | Likely cause | First check |
One quote is materially cheaper | A different cavity assumption, or a lower sensitivity class | Compare the SPL test cavity. A 99 dB figure measured at 4 cc (HS361331H) and a 95 dB figure measured at 1 cc (HS151125H) are not the same part class |
One quote shows a much higher sensitivity | A different measurement basis, not a better driver | Check whether it is fixed power, fixed voltage or a coupler reading. HS080923H's 123 dB is a coupler measurement on a different scale entirely |
Different impedance classes quoted | Different assumptions about the amplifier rail | Confirm the rail. On a fixed voltage a 4 ohm load requests roughly twice the power of an 8 ohm load, so the class follows from the rail |
Unit price differs more than the part does | Different volume tiers were assumed | Check the quantity each quote is priced at. A price against an annual volume is not comparable to one against a prototype quantity |
One quote includes tooling, another does not | Different customization rungs were assumed | Establish which rung each vendor priced — stock, interface, cavity and tuning, motor and materials, or new outline |
One quote is longer and more detailed | Different inclusions — tooling, qualification, certificates, packaging | Compare the inclusions line by line rather than the totals. A quote that omits tooling may simply have assumed a stock part |
Working through the table usually collapses most of the spread. What remains after normalisation is the real difference, and it is frequently small enough that the decision turns on something other than unit price — sample lead time, engineering responsiveness, or documentation quality.
2. FAQ on Comparing Micro Speaker Quotations
Short answer: How to tell a real difference from an assumption, whether to ask vendors to re-quote, what to do about missing fields, and which differences should disqualify a supplier.
Q1. Two quotes are 30 percent apart on the same part. What do I check first?
A1. The cavity assumption and the volume tier, in that order. Those two account for most large spreads. If one quote assumed the 4 cc cavity the part was characterised in and the other assumed the 1 cc cavity your product actually has, the parts are not the same part. If one priced an annual volume and the other a prototype quantity, neither number is wrong, they are just answering different questions.
Q2. Should I ask the vendors to re-quote on a common basis?
A2. Usually yes, and it is a normal request rather than an awkward one. Send the corrected fields — cavity, volume tier, test basis, inclusions — and ask for a revised number. A vendor who cannot restate a quote against stated conditions is giving you information about how the program will go.
Q3. One quote has a much higher sensitivity figure. Is it a better driver?
A3. Check the basis before concluding anything. In this catalog sample a 123 dB figure on HS080923H is a coupler measurement for a receiver-class part and is not on the same scale as a 95 dB free-field loudspeaker figure. A 94 dB figure at 2.83 Vrms on a 4 ohm part is roughly 2 W of drive, about 3 dB more than a 1 W figure. Ask for the test conditions with the number.
Q4. One supplier quoted a box module and another a bare driver. How do I compare those?
A4. You cannot compare them on unit price alone, because the box module includes an enclosure the bare-driver quote does not. Compare total installed cost: the driver plus the cavity it needs, the gasket and sealing, the assembly steps, and the validation time. In this catalog sample HS003021H is a 30 mm box module at 105 dB while HS003050H is a bare 30 mm driver at 97 dB — the module is louder for the same drive and taller for it.
Q5. Is the cheapest quote usually the best one?
A5. Not necessarily. The cheapest quote is often the one that assumed the most — a stock part where others priced customization, a large cavity where the product has a small one, an annual volume where the program needs prototypes. Normalise first, then compare. A quote that is cheapest after normalisation is genuinely cheaper; one that is cheapest before is usually just narrower.
Q6. What should a complete micro speaker quotation contain?
A6. Part number and revision, unit price at a stated quantity, MOQ, tooling cost if any, sample lead time and production lead time, the test conditions behind any performance claim, compliance certificates with part and batch reference, packaging specification, and the quote's validity period. Missing fields are the normalisation work list.
Q7. One quote omits the test conditions entirely. Is that a problem?
A7. It is worth one clarifying question. A performance figure without its conditions — drive level, distance, frequency and cavity — cannot be verified against your target, and the omission usually means the vendor quoted from a catalog line rather than from your RFQ. Ask for the conditions in writing; the answer is informative either way.
Q8. How long should I expect a quotation to stay valid?
A8. Quotation validity periods vary with the supplier, the materials involved and market conditions, so confirm the stated validity on the quote itself rather than assuming a standard window. Where a program expects to decide slowly, ask for the validity period in writing up front — it is a reasonable question on an RFQ.
3. How to Normalize Incoming Quotes
Short answer: Put every quote on the same cavity, the same volume tier, the same test basis and the same list of inclusions, then compare what is left. The residue is the real difference.
Normalisation is a short, repeatable sequence. Run it on every quote before comparing totals, and the comparison becomes straightforward.
1. Write down the four conditions your product actually has: rear cavity volume, amplifier rail and topology, target SPL with its distance and drive level, and the volume tier you are really buying at.
2. For each quote, find the quoted part's datasheet line and read the cavity, the drive basis and the impedance against your four conditions. Mark each as matching or not matching.
3. For any quote that does not match, send one consolidated clarification with the corrected fields and ask for a restated number. Do this for all vendors in the same round so nobody gains an information advantage.
4. Separate inclusions from unit price. List tooling, qualification, certificates, packaging and freight as separate lines for each quote, and add them to the unit price at your real quantity.
5. Establish the customization rung each vendor priced — stock, interface, cavity and tuning, motor and materials, or new outline — and confirm that all quotes are at the same rung.
6. Convert sensitivities to a common basis where the test conditions differ. A fixed-voltage figure on a 4 ohm part is roughly 2 W of drive and about 3 dB above a 1 W figure; a coupler reading is on a different scale and cannot be converted by arithmetic alone.
7. Compare the residues. What survives normalisation is the genuine difference, and it is usually much smaller than the headline spread suggested.
The step most often skipped is the fourth one. Two quotes with the same unit price can differ substantially once tooling, qualification and packaging are added at the real quantity, and a quote that looked cheapest on unit price can be the most expensive on total installed cost.
4. What a Complete Quotation Should Contain
Short answer: Part number and revision, price at a stated quantity, MOQ, tooling, both lead times, test conditions, compliance evidence, packaging, and a validity period. Nine fields; a quote missing several is not yet comparable.
The table below is the completeness check. A quotation missing one or two fields is normal and fixable with a clarification; one missing five is usually a catalog line rather than a quotation against your request.
Table 2: The nine fields a complete micro speaker quotation should carry, and what each one protects against.
Field | What it should state | What it protects against |
Part number and revision | The exact part and its datasheet revision | Being quoted a superseded or different part |
Unit price at a stated quantity | Price and the quantity it applies to | Comparing a prototype price against a production price |
Minimum order quantity | The MOQ in pieces, stated as a number | Discovering a volume commitment after selection |
Tooling cost | Tooling as a separate line, or an explicit statement that none applies | A tooling charge appearing after selection |
Sample and production lead time | Both dates separately | An aggressive sample schedule forcing an unnecessary tooling decision |
Test conditions behind performance claims | Drive level, distance, frequency and cavity for any SPL or F0 figure | Comparing figures measured on different bases |
Compliance evidence | Certificates with part number, batch and laboratory reference | A documentation gap at customs or at qualification |
Packaging specification | Packing method, quantity per pack, labelling | Receiving and line-feeding problems at volume |
Quotation validity period | How long the stated prices hold | A price change between selection and order |
None of those nine fields is unusual to ask for, and a supplier who returns all nine without being asked has told the program something useful about how the engagement will run.
5. Project Case: A 40 Percent Spread That Normalised to 4 Percent
Short answer: Three quotes for a voice-prompt driver spanned 40 percent on unit price. After normalising cavity, volume tier and inclusions, the real spread was 4 percent, and the decision turned on lead time.
Project snapshot
A handheld terminal program received three quotes for a voice-prompt driver spanning roughly 40 percent on unit price, and asked Hongsheng to review them. Two of the three had priced against a 4 cc cavity — the conditions under which parts such as HS361331H publish 99 dB — while the product's host supplied 1.6 cc. The third had priced a part in the 1 cc class (HS151125H, 95 dB at 1 cc BOX, F0 900 Hz) at the correct cavity but at a prototype quantity rather than the annual volume the others assumed. After the Hongsheng review restated all three against the real 1.6 cc cavity and the real annual volume, and separated tooling and packaging from unit price, the spread fell to about 4 percent. The program selected on sample lead time and documentation completeness rather than on price, because price had stopped being the differentiator once the assumptions matched.
6. Red Flags in a Micro Speaker Quotation
Short answer: The disqualifying ones are not price-related: a performance figure with no test conditions, no revision on the part, an MOQ that appears only after selection, and a refusal to restate against your stated conditions.
8. A performance figure with no test conditions behind it. Any SPL or F0 number should carry its drive level, distance, frequency and cavity; a figure without them cannot be verified against your target.
9. No revision or date on the quoted part number. A part can change between revisions, and an undated quote may describe a version that no longer ships.
10. An MOQ that only appears after selection. The quantity commitment belongs in the quote, stated as a number of pieces.
11. A refusal to restate against your stated conditions. If a vendor cannot or will not requote against the cavity, volume and test basis you have specified, that is information about the engagement.
12. Tooling quoted without a stated reason. Ask which rung the tooling is for; if the request was a cavity or interface change, tooling may indicate the vendor read it as a new outline.
13. Compliance certificates that are generic rather than tied to a part number and batch. A certificate without those references may not satisfy your market's documentation requirement.
14. A unit price with no quantity attached. Price means nothing without the volume it was calculated at.
15. Sample and production lead times given as a single number. The two are different capabilities and a vendor who quotes them separately is usually more accurate on both.
More in This Series — Micro Speaker Quotation
This article is the third of a three-part technical series on micro speaker quotations. The first covers what information to provide; the second covers which specs move price and lead time.
· Part 1 — What Information Should You Provide When Requesting a Micro Speaker Quotation? → https://www.hsdz-spk.com/news/535.html
· Part 2 — Micro Speaker RFQ: Which Specs Actually Move Price and Lead Time → https://www.hsdz-spk.com/news/536.html
7. Summary
Quotes for a nominally similar micro speaker differ for six main reasons: cavity assumptions, SPL measurement bases, impedance and rail assumptions, volume tiers, customization rungs, and inclusions. Normalising across those six — restating every quote against the product's real cavity, rail, target and volume, then separating tooling, qualification and packaging from unit price — usually collapses a large headline spread to a small real one. What survives normalisation is the genuine difference, and it frequently turns the decision toward lead time, documentation quality and engineering responsiveness rather than price.
For a program with quotes in hand, the practical next step is the seven-step normalisation sequence, run on all vendors in the same round so nobody gains an information advantage. Nine fields make a quotation complete, and a supplier who returns them without being asked has already answered one of the more useful questions about how the engagement will run. The companion articles in this series cover what to put into the request in the first place, and which specification lines move the number before it ever reaches this stage.