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Dayton Audio ND90-8NO PHOTONo photo available

Dayton Audio

Dayton Audio ND90-8

Full-range · 3.5″ · 8 Ω

Dayton Audio ND90-8: Full-range. Published Fs 70.7 Hz, Qts 0.65 , Vas 1.77 L. Explore these values before choosing an enclosure.

Resonance Fs
70.7 Hz
Nominal sensitivity
81.4 dB
Rated power
20 W
Excursion Xmax
4 mm
Design with this driver Manufacturer / original source ↗

What this driver's data tells us

Dayton Audio ND90-8

Dayton Audio ND90-8 is a Full-range. Its available data describe the following design trade-offs.

T/S parameters describe its bass behavior; they do not establish treble extension, directivity or whether a crossover-free system will meet your needs.

With Fs 70.7 Hz, Qts 0.65 and Vas 1.8 L, an ideal maximally flat sealed reference (Qtc 0.707) is approximately 9.6 L, with a −3 dB cutoff of 76.9 Hz.

This reference is compact (up to 10 L); judge its usefulness together with the cutoff above.

The calculated sealed cutoff is 60–90 Hz, so a subwoofer or another loading may help if deep bass is the goal.

Qts 0.65 calls for care with a conventional flat vented alignment; check peaks and excursion before choosing a ported box.

Published sensitivity is 81.4 dB (2.83 V / 1 m). Sensitivity describes output for the stated input, not maximum usable sound pressure.

On an approximate 1 W / 1 m basis (81.4 dB), sensitivity is modest; more input power is needed for the same rated-band output.

Basis and further reading

Calculated from published parameters; this is not a listening review. Box sizes are net acoustic volume for one driver. Room gain, EQ, damping material and construction losses are excluded.

Voltage-to-power conversion uses nominal impedance. These size, cutoff and sensitivity bands are editorial guides, not audio-quality standards.

Driver character card

Explore the stats

These bars show physical quantities, not sound-quality scores. A longer bar is not always better. Open a stat to learn what it means.

Resonance · Fs70.7 HzDisplay range: 10–2,000 Hz · log

The driver's free-air resonance. A lower value can help a bass design, but the enclosure, excursion and response determine usable bass. It is not the finished speaker's bass cutoff.

Sensitivity81.4 dBDisplay range: 65–115 dB

Output at the manufacturer's stated input and distance. 1 W and 2.83 V are different references for many impedances. This card keeps the original value and reference; it is not an efficiency or sound-quality rating.

Resonance damping · Qts0.65 Display range: 0–1.5

Electrical and mechanical damping combined. Lower values indicate stronger damping at resonance. It helps choose an enclosure alignment, but does not tell you whether the sound is fast, warm or detailed.

Suspension compliance · Vas1.77 LDisplay range: 0.1–1,000 L · log

The volume of air with the same compliance as the suspension. It is not a recommended box volume. Use it together with Fs and Qts.

Linear excursion · Xmax4 mmDisplay range: 0–30 mm

Published linear excursion. Definitions differ between manufacturers; verify one-way versus peak-to-peak values. It does not by itself predict distortion or maximum safe output.

Radiating area · Sd31.2 cm²Display range: 1–1,500 cm² · log

Effective radiating area, not the frame's outside diameter. It helps estimate how much air a cone moves when combined with excursion.

Sensitivity reference: 2.83V/1m

Which enclosure could work?

Screening guidance from the available parameters, not a guarantee. A manufacturer's exact-model enclosure plan takes priority. Listening quality cannot be ranked from T/S parameters.

Sealed

Worth trying

Fs, Qts and Vas allow a sealed-box calculation. Qts is below 0.707, so a Qtc 0.707 target may be explored; actual size and output limits still matter.

Fs 70.7 Hz · Qts 0.65 · Vas 1.77 L

Bass reflex

Needs careful design

The usual simple bass-reflex starting range does not settle this choice. Model the actual volume and tuning; do not reject or recommend the driver from Qts alone.

Fs 70.7 Hz · Qts 0.65 · Vas 1.77 L

Transmission line / quarter-wave

Needs careful design

Fs helps set a starting length, but taper, area, driver position and damping determine the result. There is no universal Qts pass/fail rule.

Fs 70.7 Hz · Qts 0.65

Back-loaded horn

Needs careful design

Its full-range role makes a back-loaded design worth investigating, but that is not proof of horn suitability. Check the exact model's recommended plan.

Use an exact-model manufacturer plan or a dedicated horn model. Qts alone cannot establish suitability. Throat, mouth, path and rear chamber must be designed together; this page does not simulate horns.

Fs 70.7 Hz · Qts 0.65
Explore other enclosure types

Mass-loaded transmission line

Needs careful design

The line and outlet act together. Tube length, area, damping and port mass require a coupled model; a bass-reflex preset is not an MLTL design.

Fs 70.7 Hz · Qts 0.65

Passive radiator system

Needs careful design

Potentially useful when a practical port is difficult, but the passive radiator's area, mass, compliance and excursion must be matched separately.

Fs 70.7 Hz · Qts 0.65

Double bass reflex

Needs careful design

Two chambers and two ducts interact. Check their combined resonances with the dedicated model; these parameters alone do not establish an advantage over bass reflex.

Fs 70.7 Hz · Qts 0.65

Open baffle

Needs careful design

Front and rear bass cancel without an enclosure. Panel size, equalization and excursion matter. Low Qts is not an automatic rejection when EQ is available.

Fs 70.7 Hz · Qts 0.65
Basis and further reading

Bass mini-lab

Move the volume slider. Both curves use the same box volume; the bass-reflex tuning is adjustable.

-36-24-120121020501002005001000Relative bass response (dB)Hz
Sealed: F3 77 Hz · peak 0 dBBass reflex: F3 54.6 Hz · peak 9.4 dB

Illustrative small-signal T/S models, not an optimized recommendation or a measured speaker. No room gain, diffraction, port losses, excursion limit or power compression is included. The initial tuning equals Fs and must be adjusted for a real build.

Read the graph as numbers
Frequency (Hz)Sealed (dB)Bass reflex (dB)
20-23.9-43.1
50-8.4-7.2
100-1.24.8
200-01.2
50000.2
100000

Frequency response Response

Common scale for all drivers: 20–20,000 Hz
Dayton Audio ND90-820 Hz — 20 kHz · Logarithmic axis
5560657075808520501002005001k2k5k10k20kdB SPLHz
Source SPL curveRecorded range: 20〜20,000 HzUnavailable or missing ranges are left blank.
Automatically validated response data2.83V/1mResponse source ↗

What do published reviews say?

Attributed summaries, not our listening test or a consensus score. The enclosure, crossover, room and listening level affect each review. Exact model and impedance are checked.

No exact-model listening review has been verified for this page yet. We do not infer tonal quality from T/S parameters or borrow reviews of similar model names.

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